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/module.h>
  15 #include <linux/uaccess.h>
  16 #include <linux/miscdevice.h>
  17 #include <linux/kernel_stat.h>
  18
  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         debug_event(chsc_debug_log_id, level, data, length);
  47 }
  48
  49 MODULE_AUTHOR("IBM Corporation");
  50 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
  51 MODULE_LICENSE("GPL");
  52
  53 static void chsc_subchannel_irq(struct subchannel *sch)
  54 {
  55         struct chsc_private *private = dev_get_drvdata(&sch->dev);
  56         struct chsc_request *request = private->request;
  57         struct irb *irb = this_cpu_ptr(&cio_irb);
  58
  59         CHSC_LOG(4, "irb");
  60         CHSC_LOG_HEX(4, irb, sizeof(*irb));
  61         inc_irq_stat(IRQIO_CSC);
  62
  63         /* Copy irb to provided request and set done. */
  64         if (!request) {
  65                 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
  66                          sch->schid.ssid, sch->schid.sch_no);
  67                 return;
  68         }
  69         private->request = NULL;
  70         memcpy(&request->irb, irb, sizeof(*irb));
  71         cio_update_schib(sch);
  72         complete(&request->completion);
  73         put_device(&sch->dev);
  74 }
  75
  76 static int chsc_subchannel_probe(struct subchannel *sch)
  77 {
  78         struct chsc_private *private;
  79         int ret;
  80
  81         CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
  82                  sch->schid.ssid, sch->schid.sch_no);
  83         sch->isc = CHSC_SCH_ISC;
  84         private = kzalloc(sizeof(*private), GFP_KERNEL);
  85         if (!private)
  86                 return -ENOMEM;
  87         dev_set_drvdata(&sch->dev, private);
  88         ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
  89         if (ret) {
  90                 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
  91                          sch->schid.ssid, sch->schid.sch_no, ret);
  92                 dev_set_drvdata(&sch->dev, NULL);
  93                 kfree(private);
  94         } else {
  95                 if (dev_get_uevent_suppress(&sch->dev)) {
  96                         dev_set_uevent_suppress(&sch->dev, 0);
  97                         kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
  98                 }
  99         }
 100         return ret;
 101 }
 102
 103 static void chsc_subchannel_remove(struct subchannel *sch)
 104 {
 105         struct chsc_private *private;
 106
 107         cio_disable_subchannel(sch);
 108         private = dev_get_drvdata(&sch->dev);
 109         dev_set_drvdata(&sch->dev, NULL);
 110         if (private->request) {
 111                 complete(&private->request->completion);
 112                 put_device(&sch->dev);
 113         }
 114         kfree(private);
 115 }
 116
 117 static void chsc_subchannel_shutdown(struct subchannel *sch)
 118 {
 119         cio_disable_subchannel(sch);
 120 }
 121
 122 static struct css_device_id chsc_subchannel_ids[] = {
 123         { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
 124         { /* end of list */ },
 125 };
 126 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
 127
 128 static struct css_driver chsc_subchannel_driver = {
 129         .drv = {
 130                 .owner = THIS_MODULE,
 131                 .name = "chsc_subchannel",
 132         },
 133         .subchannel_type = chsc_subchannel_ids,
 134         .irq = chsc_subchannel_irq,
 135         .probe = chsc_subchannel_probe,
 136         .remove = chsc_subchannel_remove,
 137         .shutdown = chsc_subchannel_shutdown,
 138 };
 139
 140 static int __init chsc_init_dbfs(void)
 141 {
 142         chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
 143         if (!chsc_debug_msg_id)
 144                 goto out;
 145         debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
 146         debug_set_level(chsc_debug_msg_id, 2);
 147         chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
 148         if (!chsc_debug_log_id)
 149                 goto out;
 150         debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
 151         debug_set_level(chsc_debug_log_id, 2);
 152         return 0;
 153 out:
 154         debug_unregister(chsc_debug_msg_id);
 155         return -ENOMEM;
 156 }
 157
 158 static void chsc_remove_dbfs(void)
 159 {
 160         debug_unregister(chsc_debug_log_id);
 161         debug_unregister(chsc_debug_msg_id);
 162 }
 163
 164 static int __init chsc_init_sch_driver(void)
 165 {
 166         return css_driver_register(&chsc_subchannel_driver);
 167 }
 168
 169 static void chsc_cleanup_sch_driver(void)
 170 {
 171         css_driver_unregister(&chsc_subchannel_driver);
 172 }
 173
 174 static DEFINE_SPINLOCK(chsc_lock);
 175
 176 static int chsc_subchannel_match_next_free(struct device *dev, const void *data)
 177 {
 178         struct subchannel *sch = to_subchannel(dev);
 179
 180         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 181 }
 182
 183 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 184 {
 185         struct device *dev;
 186
 187         dev = driver_find_device(&chsc_subchannel_driver.drv,
 188                                  sch ? &sch->dev : NULL, NULL,
 189                                  chsc_subchannel_match_next_free);
 190         return dev ? to_subchannel(dev) : NULL;
 191 }
 192
 193 /**
 194  * chsc_async() - try to start a chsc request asynchronously
 195  * @chsc_area: request to be started
 196  * @request: request structure to associate
 197  *
 198  * Tries to start a chsc request on one of the existing chsc subchannels.
 199  * Returns:
 200  *  %0 if the request was performed synchronously
 201  *  %-EINPROGRESS if the request was successfully started
 202  *  %-EBUSY if all chsc subchannels are busy
 203  *  %-ENODEV if no chsc subchannels are available
 204  * Context:
 205  *  interrupts disabled, chsc_lock held
 206  */
 207 static int chsc_async(struct chsc_async_area *chsc_area,
 208                       struct chsc_request *request)
 209 {
 210         int cc;
 211         struct chsc_private *private;
 212         struct subchannel *sch = NULL;
 213         int ret = -ENODEV;
 214         char dbf[10];
 215
 216         chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
 217         while ((sch = chsc_get_next_subchannel(sch))) {
 218                 spin_lock(sch->lock);
 219                 private = dev_get_drvdata(&sch->dev);
 220                 if (private->request) {
 221                         spin_unlock(sch->lock);
 222                         ret = -EBUSY;
 223                         continue;
 224                 }
 225                 chsc_area->header.sid = sch->schid;
 226                 CHSC_LOG(2, "schid");
 227                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 228                 cc = chsc(chsc_area);
 229                 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
 230                 CHSC_LOG(2, dbf);
 231                 switch (cc) {
 232                 case 0:
 233                         ret = 0;
 234                         break;
 235                 case 1:
 236                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 237                         ret = -EINPROGRESS;
 238                         private->request = request;
 239                         break;
 240                 case 2:
 241                         ret = -EBUSY;
 242                         break;
 243                 default:
 244                         ret = -ENODEV;
 245                 }
 246                 spin_unlock(sch->lock);
 247                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 248                          sch->schid.ssid, sch->schid.sch_no, cc);
 249                 if (ret == -EINPROGRESS)
 250                         return -EINPROGRESS;
 251                 put_device(&sch->dev);
 252                 if (ret == 0)
 253                         return 0;
 254         }
 255         return ret;
 256 }
 257
 258 static void chsc_log_command(void *chsc_area)
 259 {
 260         char dbf[10];
 261
 262         snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
 263         CHSC_LOG(0, dbf);
 264         CHSC_LOG_HEX(0, chsc_area, 32);
 265 }
 266
 267 static int chsc_examine_irb(struct chsc_request *request)
 268 {
 269         int backed_up;
 270
 271         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
 272                 return -EIO;
 273         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 274         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 275         if (scsw_cstat(&request->irb.scsw) == 0)
 276                 return 0;
 277         if (!backed_up)
 278                 return 0;
 279         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 280                 return -EIO;
 281         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 282                 return -EPERM;
 283         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 284                 return -EAGAIN;
 285         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 286                 return -EAGAIN;
 287         return -EIO;
 288 }
 289
 290 static int chsc_ioctl_start(void __user *user_area)
 291 {
 292         struct chsc_request *request;
 293         struct chsc_async_area *chsc_area;
 294         int ret;
 295         char dbf[10];
 296
 297         if (!css_general_characteristics.dynio)
 298                 /* It makes no sense to try. */
 299                 return -EOPNOTSUPP;
 300         chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 301         if (!chsc_area)
 302                 return -ENOMEM;
 303         request = kzalloc(sizeof(*request), GFP_KERNEL);
 304         if (!request) {
 305                 ret = -ENOMEM;
 306                 goto out_free;
 307         }
 308         init_completion(&request->completion);
 309         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 310                 ret = -EFAULT;
 311                 goto out_free;
 312         }
 313         chsc_log_command(chsc_area);
 314         spin_lock_irq(&chsc_lock);
 315         ret = chsc_async(chsc_area, request);
 316         spin_unlock_irq(&chsc_lock);
 317         if (ret == -EINPROGRESS) {
 318                 wait_for_completion(&request->completion);
 319                 ret = chsc_examine_irb(request);
 320         }
 321         /* copy area back to user */
 322         if (!ret)
 323                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 324                         ret = -EFAULT;
 325 out_free:
 326         snprintf(dbf, sizeof(dbf), "ret:%d", ret);
 327         CHSC_LOG(0, dbf);
 328         kfree(request);
 329         free_page((unsigned long)chsc_area);
 330         return ret;
 331 }
 332
 333 static int chsc_ioctl_on_close_set(void __user *user_area)
 334 {
 335         char dbf[13];
 336         int ret;
 337
 338         mutex_lock(&on_close_mutex);
 339         if (on_close_chsc_area) {
 340                 ret = -EBUSY;
 341                 goto out_unlock;
 342         }
 343         on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
 344         if (!on_close_request) {
 345                 ret = -ENOMEM;
 346                 goto out_unlock;
 347         }
 348         on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 349         if (!on_close_chsc_area) {
 350                 ret = -ENOMEM;
 351                 goto out_free_request;
 352         }
 353         if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
 354                 ret = -EFAULT;
 355                 goto out_free_chsc;
 356         }
 357         ret = 0;
 358         goto out_unlock;
 359
 360 out_free_chsc:
 361         free_page((unsigned long)on_close_chsc_area);
 362         on_close_chsc_area = NULL;
 363 out_free_request:
 364         kfree(on_close_request);
 365         on_close_request = NULL;
 366 out_unlock:
 367         mutex_unlock(&on_close_mutex);
 368         snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
 369         CHSC_LOG(0, dbf);
 370         return ret;
 371 }
 372
 373 static int chsc_ioctl_on_close_remove(void)
 374 {
 375         char dbf[13];
 376         int ret;
 377
 378         mutex_lock(&on_close_mutex);
 379         if (!on_close_chsc_area) {
 380                 ret = -ENOENT;
 381                 goto out_unlock;
 382         }
 383         free_page((unsigned long)on_close_chsc_area);
 384         on_close_chsc_area = NULL;
 385         kfree(on_close_request);
 386         on_close_request = NULL;
 387         ret = 0;
 388 out_unlock:
 389         mutex_unlock(&on_close_mutex);
 390         snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
 391         CHSC_LOG(0, dbf);
 392         return ret;
 393 }
 394
 395 static int chsc_ioctl_start_sync(void __user *user_area)
 396 {
 397         struct chsc_sync_area *chsc_area;
 398         int ret, ccode;
 399
 400         chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 401         if (!chsc_area)
 402                 return -ENOMEM;
 403         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 404                 ret = -EFAULT;
 405                 goto out_free;
 406         }
 407         if (chsc_area->header.code & 0x4000) {
 408                 ret = -EINVAL;
 409                 goto out_free;
 410         }
 411         chsc_log_command(chsc_area);
 412         ccode = chsc(chsc_area);
 413         if (ccode != 0) {
 414                 ret = -EIO;
 415                 goto out_free;
 416         }
 417         if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 418                 ret = -EFAULT;
 419         else
 420                 ret = 0;
 421 out_free:
 422         free_page((unsigned long)chsc_area);
 423         return ret;
 424 }
 425
 426 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 427 {
 428         struct chsc_chp_cd *cd;
 429         int ret, ccode;
 430         struct {
 431                 struct chsc_header request;
 432                 u32 : 2;
 433                 u32 m : 1;
 434                 u32 : 1;
 435                 u32 fmt1 : 4;
 436                 u32 cssid : 8;
 437                 u32 : 8;
 438                 u32 first_chpid : 8;
 439                 u32 : 24;
 440                 u32 last_chpid : 8;
 441                 u32 : 32;
 442                 struct chsc_header response;
 443                 u8 data[PAGE_SIZE - 20];
 444         } __attribute__ ((packed)) *scpcd_area;
 445
 446         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 447         if (!scpcd_area)
 448                 return -ENOMEM;
 449         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 450         if (!cd) {
 451                 ret = -ENOMEM;
 452                 goto out_free;
 453         }
 454         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 455                 ret = -EFAULT;
 456                 goto out_free;
 457         }
 458         scpcd_area->request.length = 0x0010;
 459         scpcd_area->request.code = 0x0028;
 460         scpcd_area->m = cd->m;
 461         scpcd_area->fmt1 = cd->fmt;
 462         scpcd_area->cssid = cd->chpid.cssid;
 463         scpcd_area->first_chpid = cd->chpid.id;
 464         scpcd_area->last_chpid = cd->chpid.id;
 465
 466         ccode = chsc(scpcd_area);
 467         if (ccode != 0) {
 468                 ret = -EIO;
 469                 goto out_free;
 470         }
 471         if (scpcd_area->response.code != 0x0001) {
 472                 ret = -EIO;
 473                 CHSC_MSG(0, "scpcd: response code=%x\n",
 474                          scpcd_area->response.code);
 475                 goto out_free;
 476         }
 477         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 478         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 479                 ret = -EFAULT;
 480         else
 481                 ret = 0;
 482 out_free:
 483         kfree(cd);
 484         free_page((unsigned long)scpcd_area);
 485         return ret;
 486 }
 487
 488 static int chsc_ioctl_info_cu(void __user *user_cd)
 489 {
 490         struct chsc_cu_cd *cd;
 491         int ret, ccode;
 492         struct {
 493                 struct chsc_header request;
 494                 u32 : 2;
 495                 u32 m : 1;
 496                 u32 : 1;
 497                 u32 fmt1 : 4;
 498                 u32 cssid : 8;
 499                 u32 : 8;
 500                 u32 first_cun : 8;
 501                 u32 : 24;
 502                 u32 last_cun : 8;
 503                 u32 : 32;
 504                 struct chsc_header response;
 505                 u8 data[PAGE_SIZE - 20];
 506         } __attribute__ ((packed)) *scucd_area;
 507
 508         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 509         if (!scucd_area)
 510                 return -ENOMEM;
 511         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 512         if (!cd) {
 513                 ret = -ENOMEM;
 514                 goto out_free;
 515         }
 516         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 517                 ret = -EFAULT;
 518                 goto out_free;
 519         }
 520         scucd_area->request.length = 0x0010;
 521         scucd_area->request.code = 0x0026;
 522         scucd_area->m = cd->m;
 523         scucd_area->fmt1 = cd->fmt;
 524         scucd_area->cssid = cd->cssid;
 525         scucd_area->first_cun = cd->cun;
 526         scucd_area->last_cun = cd->cun;
 527
 528         ccode = chsc(scucd_area);
 529         if (ccode != 0) {
 530                 ret = -EIO;
 531                 goto out_free;
 532         }
 533         if (scucd_area->response.code != 0x0001) {
 534                 ret = -EIO;
 535                 CHSC_MSG(0, "scucd: response code=%x\n",
 536                          scucd_area->response.code);
 537                 goto out_free;
 538         }
 539         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 540         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 541                 ret = -EFAULT;
 542         else
 543                 ret = 0;
 544 out_free:
 545         kfree(cd);
 546         free_page((unsigned long)scucd_area);
 547         return ret;
 548 }
 549
 550 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 551 {
 552         struct chsc_sch_cud *cud;
 553         int ret, ccode;
 554         struct {
 555                 struct chsc_header request;
 556                 u32 : 2;
 557                 u32 m : 1;
 558                 u32 : 5;
 559                 u32 fmt1 : 4;
 560                 u32 : 2;
 561                 u32 ssid : 2;
 562                 u32 first_sch : 16;
 563                 u32 : 8;
 564                 u32 cssid : 8;
 565                 u32 last_sch : 16;
 566                 u32 : 32;
 567                 struct chsc_header response;
 568                 u8 data[PAGE_SIZE - 20];
 569         } __attribute__ ((packed)) *sscud_area;
 570
 571         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 572         if (!sscud_area)
 573                 return -ENOMEM;
 574         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 575         if (!cud) {
 576                 ret = -ENOMEM;
 577                 goto out_free;
 578         }
 579         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 580                 ret = -EFAULT;
 581                 goto out_free;
 582         }
 583         sscud_area->request.length = 0x0010;
 584         sscud_area->request.code = 0x0006;
 585         sscud_area->m = cud->schid.m;
 586         sscud_area->fmt1 = cud->fmt;
 587         sscud_area->ssid = cud->schid.ssid;
 588         sscud_area->first_sch = cud->schid.sch_no;
 589         sscud_area->cssid = cud->schid.cssid;
 590         sscud_area->last_sch = cud->schid.sch_no;
 591
 592         ccode = chsc(sscud_area);
 593         if (ccode != 0) {
 594                 ret = -EIO;
 595                 goto out_free;
 596         }
 597         if (sscud_area->response.code != 0x0001) {
 598                 ret = -EIO;
 599                 CHSC_MSG(0, "sscud: response code=%x\n",
 600                          sscud_area->response.code);
 601                 goto out_free;
 602         }
 603         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 604         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 605                 ret = -EFAULT;
 606         else
 607                 ret = 0;
 608 out_free:
 609         kfree(cud);
 610         free_page((unsigned long)sscud_area);
 611         return ret;
 612 }
 613
 614 static int chsc_ioctl_conf_info(void __user *user_ci)
 615 {
 616         struct chsc_conf_info *ci;
 617         int ret, ccode;
 618         struct {
 619                 struct chsc_header request;
 620                 u32 : 2;
 621                 u32 m : 1;
 622                 u32 : 1;
 623                 u32 fmt1 : 4;
 624                 u32 cssid : 8;
 625                 u32 : 6;
 626                 u32 ssid : 2;
 627                 u32 : 8;
 628                 u64 : 64;
 629                 struct chsc_header response;
 630                 u8 data[PAGE_SIZE - 20];
 631         } __attribute__ ((packed)) *sci_area;
 632
 633         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 634         if (!sci_area)
 635                 return -ENOMEM;
 636         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 637         if (!ci) {
 638                 ret = -ENOMEM;
 639                 goto out_free;
 640         }
 641         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 642                 ret = -EFAULT;
 643                 goto out_free;
 644         }
 645         sci_area->request.length = 0x0010;
 646         sci_area->request.code = 0x0012;
 647         sci_area->m = ci->id.m;
 648         sci_area->fmt1 = ci->fmt;
 649         sci_area->cssid = ci->id.cssid;
 650         sci_area->ssid = ci->id.ssid;
 651
 652         ccode = chsc(sci_area);
 653         if (ccode != 0) {
 654                 ret = -EIO;
 655                 goto out_free;
 656         }
 657         if (sci_area->response.code != 0x0001) {
 658                 ret = -EIO;
 659                 CHSC_MSG(0, "sci: response code=%x\n",
 660                          sci_area->response.code);
 661                 goto out_free;
 662         }
 663         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 664         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 665                 ret = -EFAULT;
 666         else
 667                 ret = 0;
 668 out_free:
 669         kfree(ci);
 670         free_page((unsigned long)sci_area);
 671         return ret;
 672 }
 673
 674 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 675 {
 676         struct chsc_comp_list *ccl;
 677         int ret, ccode;
 678         struct {
 679                 struct chsc_header request;
 680                 u32 ctype : 8;
 681                 u32 : 4;
 682                 u32 fmt : 4;
 683                 u32 : 16;
 684                 u64 : 64;
 685                 u32 list_parm[2];
 686                 u64 : 64;
 687                 struct chsc_header response;
 688                 u8 data[PAGE_SIZE - 36];
 689         } __attribute__ ((packed)) *sccl_area;
 690         struct {
 691                 u32 m : 1;
 692                 u32 : 31;
 693                 u32 cssid : 8;
 694                 u32 : 16;
 695                 u32 chpid : 8;
 696         } __attribute__ ((packed)) *chpid_parm;
 697         struct {
 698                 u32 f_cssid : 8;
 699                 u32 l_cssid : 8;
 700                 u32 : 16;
 701                 u32 res;
 702         } __attribute__ ((packed)) *cssids_parm;
 703
 704         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 705         if (!sccl_area)
 706                 return -ENOMEM;
 707         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 708         if (!ccl) {
 709                 ret = -ENOMEM;
 710                 goto out_free;
 711         }
 712         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 713                 ret = -EFAULT;
 714                 goto out_free;
 715         }
 716         sccl_area->request.length = 0x0020;
 717         sccl_area->request.code = 0x0030;
 718         sccl_area->fmt = ccl->req.fmt;
 719         sccl_area->ctype = ccl->req.ctype;
 720         switch (sccl_area->ctype) {
 721         case CCL_CU_ON_CHP:
 722         case CCL_IOP_CHP:
 723                 chpid_parm = (void *)&sccl_area->list_parm;
 724                 chpid_parm->m = ccl->req.chpid.m;
 725                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 726                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 727                 break;
 728         case CCL_CSS_IMG:
 729         case CCL_CSS_IMG_CONF_CHAR:
 730                 cssids_parm = (void *)&sccl_area->list_parm;
 731                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 732                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 733                 break;
 734         }
 735         ccode = chsc(sccl_area);
 736         if (ccode != 0) {
 737                 ret = -EIO;
 738                 goto out_free;
 739         }
 740         if (sccl_area->response.code != 0x0001) {
 741                 ret = -EIO;
 742                 CHSC_MSG(0, "sccl: response code=%x\n",
 743                          sccl_area->response.code);
 744                 goto out_free;
 745         }
 746         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 747         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 748                 ret = -EFAULT;
 749         else
 750                 ret = 0;
 751 out_free:
 752         kfree(ccl);
 753         free_page((unsigned long)sccl_area);
 754         return ret;
 755 }
 756
 757 static int chsc_ioctl_chpd(void __user *user_chpd)
 758 {
 759         struct chsc_scpd *scpd_area;
 760         struct chsc_cpd_info *chpd;
 761         int ret;
 762
 763         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 764         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 765         if (!scpd_area || !chpd) {
 766                 ret = -ENOMEM;
 767                 goto out_free;
 768         }
 769         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 770                 ret = -EFAULT;
 771                 goto out_free;
 772         }
 773         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 774                                                chpd->rfmt, chpd->c, chpd->m,
 775                                                scpd_area);
 776         if (ret)
 777                 goto out_free;
 778         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 779         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 780                 ret = -EFAULT;
 781 out_free:
 782         kfree(chpd);
 783         free_page((unsigned long)scpd_area);
 784         return ret;
 785 }
 786
 787 static int chsc_ioctl_dcal(void __user *user_dcal)
 788 {
 789         struct chsc_dcal *dcal;
 790         int ret, ccode;
 791         struct {
 792                 struct chsc_header request;
 793                 u32 atype : 8;
 794                 u32 : 4;
 795                 u32 fmt : 4;
 796                 u32 : 16;
 797                 u32 res0[2];
 798                 u32 list_parm[2];
 799                 u32 res1[2];
 800                 struct chsc_header response;
 801                 u8 data[PAGE_SIZE - 36];
 802         } __attribute__ ((packed)) *sdcal_area;
 803
 804         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 805         if (!sdcal_area)
 806                 return -ENOMEM;
 807         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 808         if (!dcal) {
 809                 ret = -ENOMEM;
 810                 goto out_free;
 811         }
 812         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 813                 ret = -EFAULT;
 814                 goto out_free;
 815         }
 816         sdcal_area->request.length = 0x0020;
 817         sdcal_area->request.code = 0x0034;
 818         sdcal_area->atype = dcal->req.atype;
 819         sdcal_area->fmt = dcal->req.fmt;
 820         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 821                sizeof(sdcal_area->list_parm));
 822
 823         ccode = chsc(sdcal_area);
 824         if (ccode != 0) {
 825                 ret = -EIO;
 826                 goto out_free;
 827         }
 828         if (sdcal_area->response.code != 0x0001) {
 829                 ret = -EIO;
 830                 CHSC_MSG(0, "sdcal: response code=%x\n",
 831                          sdcal_area->response.code);
 832                 goto out_free;
 833         }
 834         memcpy(&dcal->sdcal, &sdcal_area->response,
 835                sdcal_area->response.length);
 836         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 837                 ret = -EFAULT;
 838         else
 839                 ret = 0;
 840 out_free:
 841         kfree(dcal);
 842         free_page((unsigned long)sdcal_area);
 843         return ret;
 844 }
 845
 846 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 847                        unsigned long arg)
 848 {
 849         void __user *argp;
 850
 851         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 852         if (is_compat_task())
 853                 argp = compat_ptr(arg);
 854         else
 855                 argp = (void __user *)arg;
 856         switch (cmd) {
 857         case CHSC_START:
 858                 return chsc_ioctl_start(argp);
 859         case CHSC_START_SYNC:
 860                 return chsc_ioctl_start_sync(argp);
 861         case CHSC_INFO_CHANNEL_PATH:
 862                 return chsc_ioctl_info_channel_path(argp);
 863         case CHSC_INFO_CU:
 864                 return chsc_ioctl_info_cu(argp);
 865         case CHSC_INFO_SCH_CU:
 866                 return chsc_ioctl_info_sch_cu(argp);
 867         case CHSC_INFO_CI:
 868                 return chsc_ioctl_conf_info(argp);
 869         case CHSC_INFO_CCL:
 870                 return chsc_ioctl_conf_comp_list(argp);
 871         case CHSC_INFO_CPD:
 872                 return chsc_ioctl_chpd(argp);
 873         case CHSC_INFO_DCAL:
 874                 return chsc_ioctl_dcal(argp);
 875         case CHSC_ON_CLOSE_SET:
 876                 return chsc_ioctl_on_close_set(argp);
 877         case CHSC_ON_CLOSE_REMOVE:
 878                 return chsc_ioctl_on_close_remove();
 879         default: /* unknown ioctl number */
 880                 return -ENOIOCTLCMD;
 881         }
 882 }
 883
 884 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
 885
 886 static int chsc_open(struct inode *inode, struct file *file)
 887 {
 888         if (!atomic_dec_and_test(&chsc_ready_for_use)) {
 889                 atomic_inc(&chsc_ready_for_use);
 890                 return -EBUSY;
 891         }
 892         return nonseekable_open(inode, file);
 893 }
 894
 895 static int chsc_release(struct inode *inode, struct file *filp)
 896 {
 897         char dbf[13];
 898         int ret;
 899
 900         mutex_lock(&on_close_mutex);
 901         if (!on_close_chsc_area)
 902                 goto out_unlock;
 903         init_completion(&on_close_request->completion);
 904         CHSC_LOG(0, "on_close");
 905         chsc_log_command(on_close_chsc_area);
 906         spin_lock_irq(&chsc_lock);
 907         ret = chsc_async(on_close_chsc_area, on_close_request);
 908         spin_unlock_irq(&chsc_lock);
 909         if (ret == -EINPROGRESS) {
 910                 wait_for_completion(&on_close_request->completion);
 911                 ret = chsc_examine_irb(on_close_request);
 912         }
 913         snprintf(dbf, sizeof(dbf), "relret:%d", ret);
 914         CHSC_LOG(0, dbf);
 915         free_page((unsigned long)on_close_chsc_area);
 916         on_close_chsc_area = NULL;
 917         kfree(on_close_request);
 918         on_close_request = NULL;
 919 out_unlock:
 920         mutex_unlock(&on_close_mutex);
 921         atomic_inc(&chsc_ready_for_use);
 922         return 0;
 923 }
 924
 925 static const struct file_operations chsc_fops = {
 926         .owner = THIS_MODULE,
 927         .open = chsc_open,
 928         .release = chsc_release,
 929         .unlocked_ioctl = chsc_ioctl,
 930         .compat_ioctl = chsc_ioctl,
 931         .llseek = no_llseek,
 932 };
 933
 934 static struct miscdevice chsc_misc_device = {
 935         .minor = MISC_DYNAMIC_MINOR,
 936         .name = "chsc",
 937         .fops = &chsc_fops,
 938 };
 939
 940 static int __init chsc_misc_init(void)
 941 {
 942         return misc_register(&chsc_misc_device);
 943 }
 944
 945 static void chsc_misc_cleanup(void)
 946 {
 947         misc_deregister(&chsc_misc_device);
 948 }
 949
 950 static int __init chsc_sch_init(void)
 951 {
 952         int ret;
 953
 954         ret = chsc_init_dbfs();
 955         if (ret)
 956                 return ret;
 957         isc_register(CHSC_SCH_ISC);
 958         ret = chsc_init_sch_driver();
 959         if (ret)
 960                 goto out_dbf;
 961         ret = chsc_misc_init();
 962         if (ret)
 963                 goto out_driver;
 964         return ret;
 965 out_driver:
 966         chsc_cleanup_sch_driver();
 967 out_dbf:
 968         isc_unregister(CHSC_SCH_ISC);
 969         chsc_remove_dbfs();
 970         return ret;
 971 }
 972
 973 static void __exit chsc_sch_exit(void)
 974 {
 975         chsc_misc_cleanup();
 976         chsc_cleanup_sch_driver();
 977         isc_unregister(CHSC_SCH_ISC);
 978         chsc_remove_dbfs();
 979 }
 980
 981 module_init(chsc_sch_init);
 982 module_exit(chsc_sch_exit);