drivers/s390/cio/chsc_sch.c

   1 /*
   2  * Driver for s390 chsc subchannels
   3  *
   4  * Copyright IBM Corp. 2008, 2011
   5  *
   6  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   7  *
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/compat.h>
  12 #include <linux/device.h>
  13 #include <linux/module.h>
  14 #include <linux/uaccess.h>
  15 #include <linux/miscdevice.h>
  16 #include <linux/kernel_stat.h>
  17
  18 #include <asm/compat.h>
  19 #include <asm/cio.h>
  20 #include <asm/chsc.h>
  21 #include <asm/isc.h>
  22
  23 #include "cio.h"
  24 #include "cio_debug.h"
  25 #include "css.h"
  26 #include "chsc_sch.h"
  27 #include "ioasm.h"
  28
  29 static debug_info_t *chsc_debug_msg_id;
  30 static debug_info_t *chsc_debug_log_id;
  31
  32 static struct chsc_request *on_close_request;
  33 static struct chsc_async_area *on_close_chsc_area;
  34 static DEFINE_MUTEX(on_close_mutex);
  35
  36 #define CHSC_MSG(imp, args...) do {                                     \
  37                 debug_sprintf_event(chsc_debug_msg_id, imp , ##args);   \
  38         } while (0)
  39
  40 #define CHSC_LOG(imp, txt) do {                                 \
  41                 debug_text_event(chsc_debug_log_id, imp , txt); \
  42         } while (0)
  43
  44 static void CHSC_LOG_HEX(int level, void *data, int length)
  45 {
  46         while (length > 0) {
  47                 debug_event(chsc_debug_log_id, level, data, length);
  48                 length -= chsc_debug_log_id->buf_size;
  49                 data += chsc_debug_log_id->buf_size;
  50         }
  51 }
  52
  53 MODULE_AUTHOR("IBM Corporation");
  54 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
  55 MODULE_LICENSE("GPL");
  56
  57 static void chsc_subchannel_irq(struct subchannel *sch)
  58 {
  59         struct chsc_private *private = dev_get_drvdata(&sch->dev);
  60         struct chsc_request *request = private->request;
  61         struct irb *irb = this_cpu_ptr(&cio_irb);
  62
  63         CHSC_LOG(4, "irb");
  64         CHSC_LOG_HEX(4, irb, sizeof(*irb));
  65         inc_irq_stat(IRQIO_CSC);
  66
  67         /* Copy irb to provided request and set done. */
  68         if (!request) {
  69                 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
  70                          sch->schid.ssid, sch->schid.sch_no);
  71                 return;
  72         }
  73         private->request = NULL;
  74         memcpy(&request->irb, irb, sizeof(*irb));
  75         cio_update_schib(sch);
  76         complete(&request->completion);
  77         put_device(&sch->dev);
  78 }
  79
  80 static int chsc_subchannel_probe(struct subchannel *sch)
  81 {
  82         struct chsc_private *private;
  83         int ret;
  84
  85         CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
  86                  sch->schid.ssid, sch->schid.sch_no);
  87         sch->isc = CHSC_SCH_ISC;
  88         private = kzalloc(sizeof(*private), GFP_KERNEL);
  89         if (!private)
  90                 return -ENOMEM;
  91         dev_set_drvdata(&sch->dev, private);
  92         ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
  93         if (ret) {
  94                 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
  95                          sch->schid.ssid, sch->schid.sch_no, ret);
  96                 dev_set_drvdata(&sch->dev, NULL);
  97                 kfree(private);
  98         } else {
  99                 if (dev_get_uevent_suppress(&sch->dev)) {
 100                         dev_set_uevent_suppress(&sch->dev, 0);
 101                         kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
 102                 }
 103         }
 104         return ret;
 105 }
 106
 107 static int chsc_subchannel_remove(struct subchannel *sch)
 108 {
 109         struct chsc_private *private;
 110
 111         cio_disable_subchannel(sch);
 112         private = dev_get_drvdata(&sch->dev);
 113         dev_set_drvdata(&sch->dev, NULL);
 114         if (private->request) {
 115                 complete(&private->request->completion);
 116                 put_device(&sch->dev);
 117         }
 118         kfree(private);
 119         return 0;
 120 }
 121
 122 static void chsc_subchannel_shutdown(struct subchannel *sch)
 123 {
 124         cio_disable_subchannel(sch);
 125 }
 126
 127 static int chsc_subchannel_prepare(struct subchannel *sch)
 128 {
 129         int cc;
 130         struct schib schib;
 131         /*
 132          * Don't allow suspend while the subchannel is not idle
 133          * since we don't have a way to clear the subchannel and
 134          * cannot disable it with a request running.
 135          */
 136         cc = stsch(sch->schid, &schib);
 137         if (!cc && scsw_stctl(&schib.scsw))
 138                 return -EAGAIN;
 139         return 0;
 140 }
 141
 142 static int chsc_subchannel_freeze(struct subchannel *sch)
 143 {
 144         return cio_disable_subchannel(sch);
 145 }
 146
 147 static int chsc_subchannel_restore(struct subchannel *sch)
 148 {
 149         return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
 150 }
 151
 152 static struct css_device_id chsc_subchannel_ids[] = {
 153         { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
 154         { /* end of list */ },
 155 };
 156 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
 157
 158 static struct css_driver chsc_subchannel_driver = {
 159         .drv = {
 160                 .owner = THIS_MODULE,
 161                 .name = "chsc_subchannel",
 162         },
 163         .subchannel_type = chsc_subchannel_ids,
 164         .irq = chsc_subchannel_irq,
 165         .probe = chsc_subchannel_probe,
 166         .remove = chsc_subchannel_remove,
 167         .shutdown = chsc_subchannel_shutdown,
 168         .prepare = chsc_subchannel_prepare,
 169         .freeze = chsc_subchannel_freeze,
 170         .thaw = chsc_subchannel_restore,
 171         .restore = chsc_subchannel_restore,
 172 };
 173
 174 static int __init chsc_init_dbfs(void)
 175 {
 176         chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
 177         if (!chsc_debug_msg_id)
 178                 goto out;
 179         debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
 180         debug_set_level(chsc_debug_msg_id, 2);
 181         chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
 182         if (!chsc_debug_log_id)
 183                 goto out;
 184         debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
 185         debug_set_level(chsc_debug_log_id, 2);
 186         return 0;
 187 out:
 188         debug_unregister(chsc_debug_msg_id);
 189         return -ENOMEM;
 190 }
 191
 192 static void chsc_remove_dbfs(void)
 193 {
 194         debug_unregister(chsc_debug_log_id);
 195         debug_unregister(chsc_debug_msg_id);
 196 }
 197
 198 static int __init chsc_init_sch_driver(void)
 199 {
 200         return css_driver_register(&chsc_subchannel_driver);
 201 }
 202
 203 static void chsc_cleanup_sch_driver(void)
 204 {
 205         css_driver_unregister(&chsc_subchannel_driver);
 206 }
 207
 208 static DEFINE_SPINLOCK(chsc_lock);
 209
 210 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
 211 {
 212         struct subchannel *sch = to_subchannel(dev);
 213
 214         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 215 }
 216
 217 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 218 {
 219         struct device *dev;
 220
 221         dev = driver_find_device(&chsc_subchannel_driver.drv,
 222                                  sch ? &sch->dev : NULL, NULL,
 223                                  chsc_subchannel_match_next_free);
 224         return dev ? to_subchannel(dev) : NULL;
 225 }
 226
 227 /**
 228  * chsc_async() - try to start a chsc request asynchronously
 229  * @chsc_area: request to be started
 230  * @request: request structure to associate
 231  *
 232  * Tries to start a chsc request on one of the existing chsc subchannels.
 233  * Returns:
 234  *  %0 if the request was performed synchronously
 235  *  %-EINPROGRESS if the request was successfully started
 236  *  %-EBUSY if all chsc subchannels are busy
 237  *  %-ENODEV if no chsc subchannels are available
 238  * Context:
 239  *  interrupts disabled, chsc_lock held
 240  */
 241 static int chsc_async(struct chsc_async_area *chsc_area,
 242                       struct chsc_request *request)
 243 {
 244         int cc;
 245         struct chsc_private *private;
 246         struct subchannel *sch = NULL;
 247         int ret = -ENODEV;
 248         char dbf[10];
 249
 250         chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
 251         while ((sch = chsc_get_next_subchannel(sch))) {
 252                 spin_lock(sch->lock);
 253                 private = dev_get_drvdata(&sch->dev);
 254                 if (private->request) {
 255                         spin_unlock(sch->lock);
 256                         ret = -EBUSY;
 257                         continue;
 258                 }
 259                 chsc_area->header.sid = sch->schid;
 260                 CHSC_LOG(2, "schid");
 261                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 262                 cc = chsc(chsc_area);
 263                 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
 264                 CHSC_LOG(2, dbf);
 265                 switch (cc) {
 266                 case 0:
 267                         ret = 0;
 268                         break;
 269                 case 1:
 270                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 271                         ret = -EINPROGRESS;
 272                         private->request = request;
 273                         break;
 274                 case 2:
 275                         ret = -EBUSY;
 276                         break;
 277                 default:
 278                         ret = -ENODEV;
 279                 }
 280                 spin_unlock(sch->lock);
 281                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 282                          sch->schid.ssid, sch->schid.sch_no, cc);
 283                 if (ret == -EINPROGRESS)
 284                         return -EINPROGRESS;
 285                 put_device(&sch->dev);
 286                 if (ret == 0)
 287                         return 0;
 288         }
 289         return ret;
 290 }
 291
 292 static void chsc_log_command(void *chsc_area)
 293 {
 294         char dbf[10];
 295
 296         snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
 297         CHSC_LOG(0, dbf);
 298         CHSC_LOG_HEX(0, chsc_area, 32);
 299 }
 300
 301 static int chsc_examine_irb(struct chsc_request *request)
 302 {
 303         int backed_up;
 304
 305         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
 306                 return -EIO;
 307         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 308         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 309         if (scsw_cstat(&request->irb.scsw) == 0)
 310                 return 0;
 311         if (!backed_up)
 312                 return 0;
 313         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 314                 return -EIO;
 315         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 316                 return -EPERM;
 317         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 318                 return -EAGAIN;
 319         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 320                 return -EAGAIN;
 321         return -EIO;
 322 }
 323
 324 static int chsc_ioctl_start(void __user *user_area)
 325 {
 326         struct chsc_request *request;
 327         struct chsc_async_area *chsc_area;
 328         int ret;
 329         char dbf[10];
 330
 331         if (!css_general_characteristics.dynio)
 332                 /* It makes no sense to try. */
 333                 return -EOPNOTSUPP;
 334         chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 335         if (!chsc_area)
 336                 return -ENOMEM;
 337         request = kzalloc(sizeof(*request), GFP_KERNEL);
 338         if (!request) {
 339                 ret = -ENOMEM;
 340                 goto out_free;
 341         }
 342         init_completion(&request->completion);
 343         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 344                 ret = -EFAULT;
 345                 goto out_free;
 346         }
 347         chsc_log_command(chsc_area);
 348         spin_lock_irq(&chsc_lock);
 349         ret = chsc_async(chsc_area, request);
 350         spin_unlock_irq(&chsc_lock);
 351         if (ret == -EINPROGRESS) {
 352                 wait_for_completion(&request->completion);
 353                 ret = chsc_examine_irb(request);
 354         }
 355         /* copy area back to user */
 356         if (!ret)
 357                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 358                         ret = -EFAULT;
 359 out_free:
 360         snprintf(dbf, sizeof(dbf), "ret:%d", ret);
 361         CHSC_LOG(0, dbf);
 362         kfree(request);
 363         free_page((unsigned long)chsc_area);
 364         return ret;
 365 }
 366
 367 static int chsc_ioctl_on_close_set(void __user *user_area)
 368 {
 369         char dbf[13];
 370         int ret;
 371
 372         mutex_lock(&on_close_mutex);
 373         if (on_close_chsc_area) {
 374                 ret = -EBUSY;
 375                 goto out_unlock;
 376         }
 377         on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
 378         if (!on_close_request) {
 379                 ret = -ENOMEM;
 380                 goto out_unlock;
 381         }
 382         on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 383         if (!on_close_chsc_area) {
 384                 ret = -ENOMEM;
 385                 goto out_free_request;
 386         }
 387         if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
 388                 ret = -EFAULT;
 389                 goto out_free_chsc;
 390         }
 391         ret = 0;
 392         goto out_unlock;
 393
 394 out_free_chsc:
 395         free_page((unsigned long)on_close_chsc_area);
 396         on_close_chsc_area = NULL;
 397 out_free_request:
 398         kfree(on_close_request);
 399         on_close_request = NULL;
 400 out_unlock:
 401         mutex_unlock(&on_close_mutex);
 402         snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
 403         CHSC_LOG(0, dbf);
 404         return ret;
 405 }
 406
 407 static int chsc_ioctl_on_close_remove(void)
 408 {
 409         char dbf[13];
 410         int ret;
 411
 412         mutex_lock(&on_close_mutex);
 413         if (!on_close_chsc_area) {
 414                 ret = -ENOENT;
 415                 goto out_unlock;
 416         }
 417         free_page((unsigned long)on_close_chsc_area);
 418         on_close_chsc_area = NULL;
 419         kfree(on_close_request);
 420         on_close_request = NULL;
 421         ret = 0;
 422 out_unlock:
 423         mutex_unlock(&on_close_mutex);
 424         snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
 425         CHSC_LOG(0, dbf);
 426         return ret;
 427 }
 428
 429 static int chsc_ioctl_start_sync(void __user *user_area)
 430 {
 431         struct chsc_sync_area *chsc_area;
 432         int ret, ccode;
 433
 434         chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 435         if (!chsc_area)
 436                 return -ENOMEM;
 437         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 438                 ret = -EFAULT;
 439                 goto out_free;
 440         }
 441         if (chsc_area->header.code & 0x4000) {
 442                 ret = -EINVAL;
 443                 goto out_free;
 444         }
 445         chsc_log_command(chsc_area);
 446         ccode = chsc(chsc_area);
 447         if (ccode != 0) {
 448                 ret = -EIO;
 449                 goto out_free;
 450         }
 451         if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 452                 ret = -EFAULT;
 453         else
 454                 ret = 0;
 455 out_free:
 456         free_page((unsigned long)chsc_area);
 457         return ret;
 458 }
 459
 460 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 461 {
 462         struct chsc_chp_cd *cd;
 463         int ret, ccode;
 464         struct {
 465                 struct chsc_header request;
 466                 u32 : 2;
 467                 u32 m : 1;
 468                 u32 : 1;
 469                 u32 fmt1 : 4;
 470                 u32 cssid : 8;
 471                 u32 : 8;
 472                 u32 first_chpid : 8;
 473                 u32 : 24;
 474                 u32 last_chpid : 8;
 475                 u32 : 32;
 476                 struct chsc_header response;
 477                 u8 data[PAGE_SIZE - 20];
 478         } __attribute__ ((packed)) *scpcd_area;
 479
 480         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 481         if (!scpcd_area)
 482                 return -ENOMEM;
 483         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 484         if (!cd) {
 485                 ret = -ENOMEM;
 486                 goto out_free;
 487         }
 488         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 489                 ret = -EFAULT;
 490                 goto out_free;
 491         }
 492         scpcd_area->request.length = 0x0010;
 493         scpcd_area->request.code = 0x0028;
 494         scpcd_area->m = cd->m;
 495         scpcd_area->fmt1 = cd->fmt;
 496         scpcd_area->cssid = cd->chpid.cssid;
 497         scpcd_area->first_chpid = cd->chpid.id;
 498         scpcd_area->last_chpid = cd->chpid.id;
 499
 500         ccode = chsc(scpcd_area);
 501         if (ccode != 0) {
 502                 ret = -EIO;
 503                 goto out_free;
 504         }
 505         if (scpcd_area->response.code != 0x0001) {
 506                 ret = -EIO;
 507                 CHSC_MSG(0, "scpcd: response code=%x\n",
 508                          scpcd_area->response.code);
 509                 goto out_free;
 510         }
 511         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 512         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 513                 ret = -EFAULT;
 514         else
 515                 ret = 0;
 516 out_free:
 517         kfree(cd);
 518         free_page((unsigned long)scpcd_area);
 519         return ret;
 520 }
 521
 522 static int chsc_ioctl_info_cu(void __user *user_cd)
 523 {
 524         struct chsc_cu_cd *cd;
 525         int ret, ccode;
 526         struct {
 527                 struct chsc_header request;
 528                 u32 : 2;
 529                 u32 m : 1;
 530                 u32 : 1;
 531                 u32 fmt1 : 4;
 532                 u32 cssid : 8;
 533                 u32 : 8;
 534                 u32 first_cun : 8;
 535                 u32 : 24;
 536                 u32 last_cun : 8;
 537                 u32 : 32;
 538                 struct chsc_header response;
 539                 u8 data[PAGE_SIZE - 20];
 540         } __attribute__ ((packed)) *scucd_area;
 541
 542         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 543         if (!scucd_area)
 544                 return -ENOMEM;
 545         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 546         if (!cd) {
 547                 ret = -ENOMEM;
 548                 goto out_free;
 549         }
 550         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 551                 ret = -EFAULT;
 552                 goto out_free;
 553         }
 554         scucd_area->request.length = 0x0010;
 555         scucd_area->request.code = 0x0028;
 556         scucd_area->m = cd->m;
 557         scucd_area->fmt1 = cd->fmt;
 558         scucd_area->cssid = cd->cssid;
 559         scucd_area->first_cun = cd->cun;
 560         scucd_area->last_cun = cd->cun;
 561
 562         ccode = chsc(scucd_area);
 563         if (ccode != 0) {
 564                 ret = -EIO;
 565                 goto out_free;
 566         }
 567         if (scucd_area->response.code != 0x0001) {
 568                 ret = -EIO;
 569                 CHSC_MSG(0, "scucd: response code=%x\n",
 570                          scucd_area->response.code);
 571                 goto out_free;
 572         }
 573         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 574         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 575                 ret = -EFAULT;
 576         else
 577                 ret = 0;
 578 out_free:
 579         kfree(cd);
 580         free_page((unsigned long)scucd_area);
 581         return ret;
 582 }
 583
 584 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 585 {
 586         struct chsc_sch_cud *cud;
 587         int ret, ccode;
 588         struct {
 589                 struct chsc_header request;
 590                 u32 : 2;
 591                 u32 m : 1;
 592                 u32 : 5;
 593                 u32 fmt1 : 4;
 594                 u32 : 2;
 595                 u32 ssid : 2;
 596                 u32 first_sch : 16;
 597                 u32 : 8;
 598                 u32 cssid : 8;
 599                 u32 last_sch : 16;
 600                 u32 : 32;
 601                 struct chsc_header response;
 602                 u8 data[PAGE_SIZE - 20];
 603         } __attribute__ ((packed)) *sscud_area;
 604
 605         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 606         if (!sscud_area)
 607                 return -ENOMEM;
 608         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 609         if (!cud) {
 610                 ret = -ENOMEM;
 611                 goto out_free;
 612         }
 613         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 614                 ret = -EFAULT;
 615                 goto out_free;
 616         }
 617         sscud_area->request.length = 0x0010;
 618         sscud_area->request.code = 0x0006;
 619         sscud_area->m = cud->schid.m;
 620         sscud_area->fmt1 = cud->fmt;
 621         sscud_area->ssid = cud->schid.ssid;
 622         sscud_area->first_sch = cud->schid.sch_no;
 623         sscud_area->cssid = cud->schid.cssid;
 624         sscud_area->last_sch = cud->schid.sch_no;
 625
 626         ccode = chsc(sscud_area);
 627         if (ccode != 0) {
 628                 ret = -EIO;
 629                 goto out_free;
 630         }
 631         if (sscud_area->response.code != 0x0001) {
 632                 ret = -EIO;
 633                 CHSC_MSG(0, "sscud: response code=%x\n",
 634                          sscud_area->response.code);
 635                 goto out_free;
 636         }
 637         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 638         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 639                 ret = -EFAULT;
 640         else
 641                 ret = 0;
 642 out_free:
 643         kfree(cud);
 644         free_page((unsigned long)sscud_area);
 645         return ret;
 646 }
 647
 648 static int chsc_ioctl_conf_info(void __user *user_ci)
 649 {
 650         struct chsc_conf_info *ci;
 651         int ret, ccode;
 652         struct {
 653                 struct chsc_header request;
 654                 u32 : 2;
 655                 u32 m : 1;
 656                 u32 : 1;
 657                 u32 fmt1 : 4;
 658                 u32 cssid : 8;
 659                 u32 : 6;
 660                 u32 ssid : 2;
 661                 u32 : 8;
 662                 u64 : 64;
 663                 struct chsc_header response;
 664                 u8 data[PAGE_SIZE - 20];
 665         } __attribute__ ((packed)) *sci_area;
 666
 667         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 668         if (!sci_area)
 669                 return -ENOMEM;
 670         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 671         if (!ci) {
 672                 ret = -ENOMEM;
 673                 goto out_free;
 674         }
 675         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 676                 ret = -EFAULT;
 677                 goto out_free;
 678         }
 679         sci_area->request.length = 0x0010;
 680         sci_area->request.code = 0x0012;
 681         sci_area->m = ci->id.m;
 682         sci_area->fmt1 = ci->fmt;
 683         sci_area->cssid = ci->id.cssid;
 684         sci_area->ssid = ci->id.ssid;
 685
 686         ccode = chsc(sci_area);
 687         if (ccode != 0) {
 688                 ret = -EIO;
 689                 goto out_free;
 690         }
 691         if (sci_area->response.code != 0x0001) {
 692                 ret = -EIO;
 693                 CHSC_MSG(0, "sci: response code=%x\n",
 694                          sci_area->response.code);
 695                 goto out_free;
 696         }
 697         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 698         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 699                 ret = -EFAULT;
 700         else
 701                 ret = 0;
 702 out_free:
 703         kfree(ci);
 704         free_page((unsigned long)sci_area);
 705         return ret;
 706 }
 707
 708 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 709 {
 710         struct chsc_comp_list *ccl;
 711         int ret, ccode;
 712         struct {
 713                 struct chsc_header request;
 714                 u32 ctype : 8;
 715                 u32 : 4;
 716                 u32 fmt : 4;
 717                 u32 : 16;
 718                 u64 : 64;
 719                 u32 list_parm[2];
 720                 u64 : 64;
 721                 struct chsc_header response;
 722                 u8 data[PAGE_SIZE - 36];
 723         } __attribute__ ((packed)) *sccl_area;
 724         struct {
 725                 u32 m : 1;
 726                 u32 : 31;
 727                 u32 cssid : 8;
 728                 u32 : 16;
 729                 u32 chpid : 8;
 730         } __attribute__ ((packed)) *chpid_parm;
 731         struct {
 732                 u32 f_cssid : 8;
 733                 u32 l_cssid : 8;
 734                 u32 : 16;
 735                 u32 res;
 736         } __attribute__ ((packed)) *cssids_parm;
 737
 738         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 739         if (!sccl_area)
 740                 return -ENOMEM;
 741         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 742         if (!ccl) {
 743                 ret = -ENOMEM;
 744                 goto out_free;
 745         }
 746         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 747                 ret = -EFAULT;
 748                 goto out_free;
 749         }
 750         sccl_area->request.length = 0x0020;
 751         sccl_area->request.code = 0x0030;
 752         sccl_area->fmt = ccl->req.fmt;
 753         sccl_area->ctype = ccl->req.ctype;
 754         switch (sccl_area->ctype) {
 755         case CCL_CU_ON_CHP:
 756         case CCL_IOP_CHP:
 757                 chpid_parm = (void *)&sccl_area->list_parm;
 758                 chpid_parm->m = ccl->req.chpid.m;
 759                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 760                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 761                 break;
 762         case CCL_CSS_IMG:
 763         case CCL_CSS_IMG_CONF_CHAR:
 764                 cssids_parm = (void *)&sccl_area->list_parm;
 765                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 766                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 767                 break;
 768         }
 769         ccode = chsc(sccl_area);
 770         if (ccode != 0) {
 771                 ret = -EIO;
 772                 goto out_free;
 773         }
 774         if (sccl_area->response.code != 0x0001) {
 775                 ret = -EIO;
 776                 CHSC_MSG(0, "sccl: response code=%x\n",
 777                          sccl_area->response.code);
 778                 goto out_free;
 779         }
 780         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 781         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 782                 ret = -EFAULT;
 783         else
 784                 ret = 0;
 785 out_free:
 786         kfree(ccl);
 787         free_page((unsigned long)sccl_area);
 788         return ret;
 789 }
 790
 791 static int chsc_ioctl_chpd(void __user *user_chpd)
 792 {
 793         struct chsc_scpd *scpd_area;
 794         struct chsc_cpd_info *chpd;
 795         int ret;
 796
 797         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 798         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 799         if (!scpd_area || !chpd) {
 800                 ret = -ENOMEM;
 801                 goto out_free;
 802         }
 803         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 804                 ret = -EFAULT;
 805                 goto out_free;
 806         }
 807         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 808                                                chpd->rfmt, chpd->c, chpd->m,
 809                                                scpd_area);
 810         if (ret)
 811                 goto out_free;
 812         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 813         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 814                 ret = -EFAULT;
 815 out_free:
 816         kfree(chpd);
 817         free_page((unsigned long)scpd_area);
 818         return ret;
 819 }
 820
 821 static int chsc_ioctl_dcal(void __user *user_dcal)
 822 {
 823         struct chsc_dcal *dcal;
 824         int ret, ccode;
 825         struct {
 826                 struct chsc_header request;
 827                 u32 atype : 8;
 828                 u32 : 4;
 829                 u32 fmt : 4;
 830                 u32 : 16;
 831                 u32 res0[2];
 832                 u32 list_parm[2];
 833                 u32 res1[2];
 834                 struct chsc_header response;
 835                 u8 data[PAGE_SIZE - 36];
 836         } __attribute__ ((packed)) *sdcal_area;
 837
 838         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 839         if (!sdcal_area)
 840                 return -ENOMEM;
 841         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 842         if (!dcal) {
 843                 ret = -ENOMEM;
 844                 goto out_free;
 845         }
 846         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 847                 ret = -EFAULT;
 848                 goto out_free;
 849         }
 850         sdcal_area->request.length = 0x0020;
 851         sdcal_area->request.code = 0x0034;
 852         sdcal_area->atype = dcal->req.atype;
 853         sdcal_area->fmt = dcal->req.fmt;
 854         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 855                sizeof(sdcal_area->list_parm));
 856
 857         ccode = chsc(sdcal_area);
 858         if (ccode != 0) {
 859                 ret = -EIO;
 860                 goto out_free;
 861         }
 862         if (sdcal_area->response.code != 0x0001) {
 863                 ret = -EIO;
 864                 CHSC_MSG(0, "sdcal: response code=%x\n",
 865                          sdcal_area->response.code);
 866                 goto out_free;
 867         }
 868         memcpy(&dcal->sdcal, &sdcal_area->response,
 869                sdcal_area->response.length);
 870         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 871                 ret = -EFAULT;
 872         else
 873                 ret = 0;
 874 out_free:
 875         kfree(dcal);
 876         free_page((unsigned long)sdcal_area);
 877         return ret;
 878 }
 879
 880 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 881                        unsigned long arg)
 882 {
 883         void __user *argp;
 884
 885         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 886         if (is_compat_task())
 887                 argp = compat_ptr(arg);
 888         else
 889                 argp = (void __user *)arg;
 890         switch (cmd) {
 891         case CHSC_START:
 892                 return chsc_ioctl_start(argp);
 893         case CHSC_START_SYNC:
 894                 return chsc_ioctl_start_sync(argp);
 895         case CHSC_INFO_CHANNEL_PATH:
 896                 return chsc_ioctl_info_channel_path(argp);
 897         case CHSC_INFO_CU:
 898                 return chsc_ioctl_info_cu(argp);
 899         case CHSC_INFO_SCH_CU:
 900                 return chsc_ioctl_info_sch_cu(argp);
 901         case CHSC_INFO_CI:
 902                 return chsc_ioctl_conf_info(argp);
 903         case CHSC_INFO_CCL:
 904                 return chsc_ioctl_conf_comp_list(argp);
 905         case CHSC_INFO_CPD:
 906                 return chsc_ioctl_chpd(argp);
 907         case CHSC_INFO_DCAL:
 908                 return chsc_ioctl_dcal(argp);
 909         case CHSC_ON_CLOSE_SET:
 910                 return chsc_ioctl_on_close_set(argp);
 911         case CHSC_ON_CLOSE_REMOVE:
 912                 return chsc_ioctl_on_close_remove();
 913         default: /* unknown ioctl number */
 914                 return -ENOIOCTLCMD;
 915         }
 916 }
 917
 918 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
 919
 920 static int chsc_open(struct inode *inode, struct file *file)
 921 {
 922         if (!atomic_dec_and_test(&chsc_ready_for_use)) {
 923                 atomic_inc(&chsc_ready_for_use);
 924                 return -EBUSY;
 925         }
 926         return nonseekable_open(inode, file);
 927 }
 928
 929 static int chsc_release(struct inode *inode, struct file *filp)
 930 {
 931         char dbf[13];
 932         int ret;
 933
 934         mutex_lock(&on_close_mutex);
 935         if (!on_close_chsc_area)
 936                 goto out_unlock;
 937         init_completion(&on_close_request->completion);
 938         CHSC_LOG(0, "on_close");
 939         chsc_log_command(on_close_chsc_area);
 940         spin_lock_irq(&chsc_lock);
 941         ret = chsc_async(on_close_chsc_area, on_close_request);
 942         spin_unlock_irq(&chsc_lock);
 943         if (ret == -EINPROGRESS) {
 944                 wait_for_completion(&on_close_request->completion);
 945                 ret = chsc_examine_irb(on_close_request);
 946         }
 947         snprintf(dbf, sizeof(dbf), "relret:%d", ret);
 948         CHSC_LOG(0, dbf);
 949         free_page((unsigned long)on_close_chsc_area);
 950         on_close_chsc_area = NULL;
 951         kfree(on_close_request);
 952         on_close_request = NULL;
 953 out_unlock:
 954         mutex_unlock(&on_close_mutex);
 955         atomic_inc(&chsc_ready_for_use);
 956         return 0;
 957 }
 958
 959 static const struct file_operations chsc_fops = {
 960         .owner = THIS_MODULE,
 961         .open = chsc_open,
 962         .release = chsc_release,
 963         .unlocked_ioctl = chsc_ioctl,
 964         .compat_ioctl = chsc_ioctl,
 965         .llseek = no_llseek,
 966 };
 967
 968 static struct miscdevice chsc_misc_device = {
 969         .minor = MISC_DYNAMIC_MINOR,
 970         .name = "chsc",
 971         .fops = &chsc_fops,
 972 };
 973
 974 static int __init chsc_misc_init(void)
 975 {
 976         return misc_register(&chsc_misc_device);
 977 }
 978
 979 static void chsc_misc_cleanup(void)
 980 {
 981         misc_deregister(&chsc_misc_device);
 982 }
 983
 984 static int __init chsc_sch_init(void)
 985 {
 986         int ret;
 987
 988         ret = chsc_init_dbfs();
 989         if (ret)
 990                 return ret;
 991         isc_register(CHSC_SCH_ISC);
 992         ret = chsc_init_sch_driver();
 993         if (ret)
 994                 goto out_dbf;
 995         ret = chsc_misc_init();
 996         if (ret)
 997                 goto out_driver;
 998         return ret;
 999 out_driver:
1000         chsc_cleanup_sch_driver();
1001 out_dbf:
1002         isc_unregister(CHSC_SCH_ISC);
1003         chsc_remove_dbfs();
1004         return ret;
1005 }
1006
1007 static void __exit chsc_sch_exit(void)
1008 {
1009         chsc_misc_cleanup();
1010         chsc_cleanup_sch_driver();
1011         isc_unregister(CHSC_SCH_ISC);
1012         chsc_remove_dbfs();
1013 }
1014
1015 module_init(chsc_sch_init);
1016 module_exit(chsc_sch_exit);