kernel/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_err(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         if (chsc_debug_msg_id)
 189                 debug_unregister(chsc_debug_msg_id);
 190         return -ENOMEM;
 191 }
 192
 193 static void chsc_remove_dbfs(void)
 194 {
 195         debug_unregister(chsc_debug_log_id);
 196         debug_unregister(chsc_debug_msg_id);
 197 }
 198
 199 static int __init chsc_init_sch_driver(void)
 200 {
 201         return css_driver_register(&chsc_subchannel_driver);
 202 }
 203
 204 static void chsc_cleanup_sch_driver(void)
 205 {
 206         css_driver_unregister(&chsc_subchannel_driver);
 207 }
 208
 209 static DEFINE_SPINLOCK(chsc_lock);
 210
 211 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
 212 {
 213         struct subchannel *sch = to_subchannel(dev);
 214
 215         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 216 }
 217
 218 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 219 {
 220         struct device *dev;
 221
 222         dev = driver_find_device(&chsc_subchannel_driver.drv,
 223                                  sch ? &sch->dev : NULL, NULL,
 224                                  chsc_subchannel_match_next_free);
 225         return dev ? to_subchannel(dev) : NULL;
 226 }
 227
 228 /**
 229  * chsc_async() - try to start a chsc request asynchronously
 230  * @chsc_area: request to be started
 231  * @request: request structure to associate
 232  *
 233  * Tries to start a chsc request on one of the existing chsc subchannels.
 234  * Returns:
 235  *  %0 if the request was performed synchronously
 236  *  %-EINPROGRESS if the request was successfully started
 237  *  %-EBUSY if all chsc subchannels are busy
 238  *  %-ENODEV if no chsc subchannels are available
 239  * Context:
 240  *  interrupts disabled, chsc_lock held
 241  */
 242 static int chsc_async(struct chsc_async_area *chsc_area,
 243                       struct chsc_request *request)
 244 {
 245         int cc;
 246         struct chsc_private *private;
 247         struct subchannel *sch = NULL;
 248         int ret = -ENODEV;
 249         char dbf[10];
 250
 251         chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
 252         while ((sch = chsc_get_next_subchannel(sch))) {
 253                 spin_lock(sch->lock);
 254                 private = dev_get_drvdata(&sch->dev);
 255                 if (private->request) {
 256                         spin_unlock(sch->lock);
 257                         ret = -EBUSY;
 258                         continue;
 259                 }
 260                 chsc_area->header.sid = sch->schid;
 261                 CHSC_LOG(2, "schid");
 262                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 263                 cc = chsc(chsc_area);
 264                 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
 265                 CHSC_LOG(2, dbf);
 266                 switch (cc) {
 267                 case 0:
 268                         ret = 0;
 269                         break;
 270                 case 1:
 271                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 272                         ret = -EINPROGRESS;
 273                         private->request = request;
 274                         break;
 275                 case 2:
 276                         ret = -EBUSY;
 277                         break;
 278                 default:
 279                         ret = -ENODEV;
 280                 }
 281                 spin_unlock(sch->lock);
 282                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 283                          sch->schid.ssid, sch->schid.sch_no, cc);
 284                 if (ret == -EINPROGRESS)
 285                         return -EINPROGRESS;
 286                 put_device(&sch->dev);
 287                 if (ret == 0)
 288                         return 0;
 289         }
 290         return ret;
 291 }
 292
 293 static void chsc_log_command(void *chsc_area)
 294 {
 295         char dbf[10];
 296
 297         snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
 298         CHSC_LOG(0, dbf);
 299         CHSC_LOG_HEX(0, chsc_area, 32);
 300 }
 301
 302 static int chsc_examine_irb(struct chsc_request *request)
 303 {
 304         int backed_up;
 305
 306         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
 307                 return -EIO;
 308         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 309         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 310         if (scsw_cstat(&request->irb.scsw) == 0)
 311                 return 0;
 312         if (!backed_up)
 313                 return 0;
 314         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 315                 return -EIO;
 316         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 317                 return -EPERM;
 318         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 319                 return -EAGAIN;
 320         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 321                 return -EAGAIN;
 322         return -EIO;
 323 }
 324
 325 static int chsc_ioctl_start(void __user *user_area)
 326 {
 327         struct chsc_request *request;
 328         struct chsc_async_area *chsc_area;
 329         int ret;
 330         char dbf[10];
 331
 332         if (!css_general_characteristics.dynio)
 333                 /* It makes no sense to try. */
 334                 return -EOPNOTSUPP;
 335         chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 336         if (!chsc_area)
 337                 return -ENOMEM;
 338         request = kzalloc(sizeof(*request), GFP_KERNEL);
 339         if (!request) {
 340                 ret = -ENOMEM;
 341                 goto out_free;
 342         }
 343         init_completion(&request->completion);
 344         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 345                 ret = -EFAULT;
 346                 goto out_free;
 347         }
 348         chsc_log_command(chsc_area);
 349         spin_lock_irq(&chsc_lock);
 350         ret = chsc_async(chsc_area, request);
 351         spin_unlock_irq(&chsc_lock);
 352         if (ret == -EINPROGRESS) {
 353                 wait_for_completion(&request->completion);
 354                 ret = chsc_examine_irb(request);
 355         }
 356         /* copy area back to user */
 357         if (!ret)
 358                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 359                         ret = -EFAULT;
 360 out_free:
 361         snprintf(dbf, sizeof(dbf), "ret:%d", ret);
 362         CHSC_LOG(0, dbf);
 363         kfree(request);
 364         free_page((unsigned long)chsc_area);
 365         return ret;
 366 }
 367
 368 static int chsc_ioctl_on_close_set(void __user *user_area)
 369 {
 370         char dbf[13];
 371         int ret;
 372
 373         mutex_lock(&on_close_mutex);
 374         if (on_close_chsc_area) {
 375                 ret = -EBUSY;
 376                 goto out_unlock;
 377         }
 378         on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
 379         if (!on_close_request) {
 380                 ret = -ENOMEM;
 381                 goto out_unlock;
 382         }
 383         on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 384         if (!on_close_chsc_area) {
 385                 ret = -ENOMEM;
 386                 goto out_free_request;
 387         }
 388         if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
 389                 ret = -EFAULT;
 390                 goto out_free_chsc;
 391         }
 392         ret = 0;
 393         goto out_unlock;
 394
 395 out_free_chsc:
 396         free_page((unsigned long)on_close_chsc_area);
 397         on_close_chsc_area = NULL;
 398 out_free_request:
 399         kfree(on_close_request);
 400         on_close_request = NULL;
 401 out_unlock:
 402         mutex_unlock(&on_close_mutex);
 403         snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
 404         CHSC_LOG(0, dbf);
 405         return ret;
 406 }
 407
 408 static int chsc_ioctl_on_close_remove(void)
 409 {
 410         char dbf[13];
 411         int ret;
 412
 413         mutex_lock(&on_close_mutex);
 414         if (!on_close_chsc_area) {
 415                 ret = -ENOENT;
 416                 goto out_unlock;
 417         }
 418         free_page((unsigned long)on_close_chsc_area);
 419         on_close_chsc_area = NULL;
 420         kfree(on_close_request);
 421         on_close_request = NULL;
 422         ret = 0;
 423 out_unlock:
 424         mutex_unlock(&on_close_mutex);
 425         snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
 426         CHSC_LOG(0, dbf);
 427         return ret;
 428 }
 429
 430 static int chsc_ioctl_start_sync(void __user *user_area)
 431 {
 432         struct chsc_sync_area *chsc_area;
 433         int ret, ccode;
 434
 435         chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 436         if (!chsc_area)
 437                 return -ENOMEM;
 438         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 439                 ret = -EFAULT;
 440                 goto out_free;
 441         }
 442         if (chsc_area->header.code & 0x4000) {
 443                 ret = -EINVAL;
 444                 goto out_free;
 445         }
 446         chsc_log_command(chsc_area);
 447         ccode = chsc(chsc_area);
 448         if (ccode != 0) {
 449                 ret = -EIO;
 450                 goto out_free;
 451         }
 452         if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 453                 ret = -EFAULT;
 454         else
 455                 ret = 0;
 456 out_free:
 457         free_page((unsigned long)chsc_area);
 458         return ret;
 459 }
 460
 461 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 462 {
 463         struct chsc_chp_cd *cd;
 464         int ret, ccode;
 465         struct {
 466                 struct chsc_header request;
 467                 u32 : 2;
 468                 u32 m : 1;
 469                 u32 : 1;
 470                 u32 fmt1 : 4;
 471                 u32 cssid : 8;
 472                 u32 : 8;
 473                 u32 first_chpid : 8;
 474                 u32 : 24;
 475                 u32 last_chpid : 8;
 476                 u32 : 32;
 477                 struct chsc_header response;
 478                 u8 data[PAGE_SIZE - 20];
 479         } __attribute__ ((packed)) *scpcd_area;
 480
 481         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 482         if (!scpcd_area)
 483                 return -ENOMEM;
 484         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 485         if (!cd) {
 486                 ret = -ENOMEM;
 487                 goto out_free;
 488         }
 489         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 490                 ret = -EFAULT;
 491                 goto out_free;
 492         }
 493         scpcd_area->request.length = 0x0010;
 494         scpcd_area->request.code = 0x0028;
 495         scpcd_area->m = cd->m;
 496         scpcd_area->fmt1 = cd->fmt;
 497         scpcd_area->cssid = cd->chpid.cssid;
 498         scpcd_area->first_chpid = cd->chpid.id;
 499         scpcd_area->last_chpid = cd->chpid.id;
 500
 501         ccode = chsc(scpcd_area);
 502         if (ccode != 0) {
 503                 ret = -EIO;
 504                 goto out_free;
 505         }
 506         if (scpcd_area->response.code != 0x0001) {
 507                 ret = -EIO;
 508                 CHSC_MSG(0, "scpcd: response code=%x\n",
 509                          scpcd_area->response.code);
 510                 goto out_free;
 511         }
 512         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 513         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 514                 ret = -EFAULT;
 515         else
 516                 ret = 0;
 517 out_free:
 518         kfree(cd);
 519         free_page((unsigned long)scpcd_area);
 520         return ret;
 521 }
 522
 523 static int chsc_ioctl_info_cu(void __user *user_cd)
 524 {
 525         struct chsc_cu_cd *cd;
 526         int ret, ccode;
 527         struct {
 528                 struct chsc_header request;
 529                 u32 : 2;
 530                 u32 m : 1;
 531                 u32 : 1;
 532                 u32 fmt1 : 4;
 533                 u32 cssid : 8;
 534                 u32 : 8;
 535                 u32 first_cun : 8;
 536                 u32 : 24;
 537                 u32 last_cun : 8;
 538                 u32 : 32;
 539                 struct chsc_header response;
 540                 u8 data[PAGE_SIZE - 20];
 541         } __attribute__ ((packed)) *scucd_area;
 542
 543         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 544         if (!scucd_area)
 545                 return -ENOMEM;
 546         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 547         if (!cd) {
 548                 ret = -ENOMEM;
 549                 goto out_free;
 550         }
 551         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 552                 ret = -EFAULT;
 553                 goto out_free;
 554         }
 555         scucd_area->request.length = 0x0010;
 556         scucd_area->request.code = 0x0028;
 557         scucd_area->m = cd->m;
 558         scucd_area->fmt1 = cd->fmt;
 559         scucd_area->cssid = cd->cssid;
 560         scucd_area->first_cun = cd->cun;
 561         scucd_area->last_cun = cd->cun;
 562
 563         ccode = chsc(scucd_area);
 564         if (ccode != 0) {
 565                 ret = -EIO;
 566                 goto out_free;
 567         }
 568         if (scucd_area->response.code != 0x0001) {
 569                 ret = -EIO;
 570                 CHSC_MSG(0, "scucd: response code=%x\n",
 571                          scucd_area->response.code);
 572                 goto out_free;
 573         }
 574         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 575         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 576                 ret = -EFAULT;
 577         else
 578                 ret = 0;
 579 out_free:
 580         kfree(cd);
 581         free_page((unsigned long)scucd_area);
 582         return ret;
 583 }
 584
 585 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 586 {
 587         struct chsc_sch_cud *cud;
 588         int ret, ccode;
 589         struct {
 590                 struct chsc_header request;
 591                 u32 : 2;
 592                 u32 m : 1;
 593                 u32 : 5;
 594                 u32 fmt1 : 4;
 595                 u32 : 2;
 596                 u32 ssid : 2;
 597                 u32 first_sch : 16;
 598                 u32 : 8;
 599                 u32 cssid : 8;
 600                 u32 last_sch : 16;
 601                 u32 : 32;
 602                 struct chsc_header response;
 603                 u8 data[PAGE_SIZE - 20];
 604         } __attribute__ ((packed)) *sscud_area;
 605
 606         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 607         if (!sscud_area)
 608                 return -ENOMEM;
 609         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 610         if (!cud) {
 611                 ret = -ENOMEM;
 612                 goto out_free;
 613         }
 614         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 615                 ret = -EFAULT;
 616                 goto out_free;
 617         }
 618         sscud_area->request.length = 0x0010;
 619         sscud_area->request.code = 0x0006;
 620         sscud_area->m = cud->schid.m;
 621         sscud_area->fmt1 = cud->fmt;
 622         sscud_area->ssid = cud->schid.ssid;
 623         sscud_area->first_sch = cud->schid.sch_no;
 624         sscud_area->cssid = cud->schid.cssid;
 625         sscud_area->last_sch = cud->schid.sch_no;
 626
 627         ccode = chsc(sscud_area);
 628         if (ccode != 0) {
 629                 ret = -EIO;
 630                 goto out_free;
 631         }
 632         if (sscud_area->response.code != 0x0001) {
 633                 ret = -EIO;
 634                 CHSC_MSG(0, "sscud: response code=%x\n",
 635                          sscud_area->response.code);
 636                 goto out_free;
 637         }
 638         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 639         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 640                 ret = -EFAULT;
 641         else
 642                 ret = 0;
 643 out_free:
 644         kfree(cud);
 645         free_page((unsigned long)sscud_area);
 646         return ret;
 647 }
 648
 649 static int chsc_ioctl_conf_info(void __user *user_ci)
 650 {
 651         struct chsc_conf_info *ci;
 652         int ret, ccode;
 653         struct {
 654                 struct chsc_header request;
 655                 u32 : 2;
 656                 u32 m : 1;
 657                 u32 : 1;
 658                 u32 fmt1 : 4;
 659                 u32 cssid : 8;
 660                 u32 : 6;
 661                 u32 ssid : 2;
 662                 u32 : 8;
 663                 u64 : 64;
 664                 struct chsc_header response;
 665                 u8 data[PAGE_SIZE - 20];
 666         } __attribute__ ((packed)) *sci_area;
 667
 668         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 669         if (!sci_area)
 670                 return -ENOMEM;
 671         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 672         if (!ci) {
 673                 ret = -ENOMEM;
 674                 goto out_free;
 675         }
 676         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 677                 ret = -EFAULT;
 678                 goto out_free;
 679         }
 680         sci_area->request.length = 0x0010;
 681         sci_area->request.code = 0x0012;
 682         sci_area->m = ci->id.m;
 683         sci_area->fmt1 = ci->fmt;
 684         sci_area->cssid = ci->id.cssid;
 685         sci_area->ssid = ci->id.ssid;
 686
 687         ccode = chsc(sci_area);
 688         if (ccode != 0) {
 689                 ret = -EIO;
 690                 goto out_free;
 691         }
 692         if (sci_area->response.code != 0x0001) {
 693                 ret = -EIO;
 694                 CHSC_MSG(0, "sci: response code=%x\n",
 695                          sci_area->response.code);
 696                 goto out_free;
 697         }
 698         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 699         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 700                 ret = -EFAULT;
 701         else
 702                 ret = 0;
 703 out_free:
 704         kfree(ci);
 705         free_page((unsigned long)sci_area);
 706         return ret;
 707 }
 708
 709 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 710 {
 711         struct chsc_comp_list *ccl;
 712         int ret, ccode;
 713         struct {
 714                 struct chsc_header request;
 715                 u32 ctype : 8;
 716                 u32 : 4;
 717                 u32 fmt : 4;
 718                 u32 : 16;
 719                 u64 : 64;
 720                 u32 list_parm[2];
 721                 u64 : 64;
 722                 struct chsc_header response;
 723                 u8 data[PAGE_SIZE - 36];
 724         } __attribute__ ((packed)) *sccl_area;
 725         struct {
 726                 u32 m : 1;
 727                 u32 : 31;
 728                 u32 cssid : 8;
 729                 u32 : 16;
 730                 u32 chpid : 8;
 731         } __attribute__ ((packed)) *chpid_parm;
 732         struct {
 733                 u32 f_cssid : 8;
 734                 u32 l_cssid : 8;
 735                 u32 : 16;
 736                 u32 res;
 737         } __attribute__ ((packed)) *cssids_parm;
 738
 739         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 740         if (!sccl_area)
 741                 return -ENOMEM;
 742         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 743         if (!ccl) {
 744                 ret = -ENOMEM;
 745                 goto out_free;
 746         }
 747         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 748                 ret = -EFAULT;
 749                 goto out_free;
 750         }
 751         sccl_area->request.length = 0x0020;
 752         sccl_area->request.code = 0x0030;
 753         sccl_area->fmt = ccl->req.fmt;
 754         sccl_area->ctype = ccl->req.ctype;
 755         switch (sccl_area->ctype) {
 756         case CCL_CU_ON_CHP:
 757         case CCL_IOP_CHP:
 758                 chpid_parm = (void *)&sccl_area->list_parm;
 759                 chpid_parm->m = ccl->req.chpid.m;
 760                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 761                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 762                 break;
 763         case CCL_CSS_IMG:
 764         case CCL_CSS_IMG_CONF_CHAR:
 765                 cssids_parm = (void *)&sccl_area->list_parm;
 766                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 767                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 768                 break;
 769         }
 770         ccode = chsc(sccl_area);
 771         if (ccode != 0) {
 772                 ret = -EIO;
 773                 goto out_free;
 774         }
 775         if (sccl_area->response.code != 0x0001) {
 776                 ret = -EIO;
 777                 CHSC_MSG(0, "sccl: response code=%x\n",
 778                          sccl_area->response.code);
 779                 goto out_free;
 780         }
 781         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 782         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 783                 ret = -EFAULT;
 784         else
 785                 ret = 0;
 786 out_free:
 787         kfree(ccl);
 788         free_page((unsigned long)sccl_area);
 789         return ret;
 790 }
 791
 792 static int chsc_ioctl_chpd(void __user *user_chpd)
 793 {
 794         struct chsc_scpd *scpd_area;
 795         struct chsc_cpd_info *chpd;
 796         int ret;
 797
 798         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 799         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 800         if (!scpd_area || !chpd) {
 801                 ret = -ENOMEM;
 802                 goto out_free;
 803         }
 804         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 805                 ret = -EFAULT;
 806                 goto out_free;
 807         }
 808         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 809                                                chpd->rfmt, chpd->c, chpd->m,
 810                                                scpd_area);
 811         if (ret)
 812                 goto out_free;
 813         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 814         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 815                 ret = -EFAULT;
 816 out_free:
 817         kfree(chpd);
 818         free_page((unsigned long)scpd_area);
 819         return ret;
 820 }
 821
 822 static int chsc_ioctl_dcal(void __user *user_dcal)
 823 {
 824         struct chsc_dcal *dcal;
 825         int ret, ccode;
 826         struct {
 827                 struct chsc_header request;
 828                 u32 atype : 8;
 829                 u32 : 4;
 830                 u32 fmt : 4;
 831                 u32 : 16;
 832                 u32 res0[2];
 833                 u32 list_parm[2];
 834                 u32 res1[2];
 835                 struct chsc_header response;
 836                 u8 data[PAGE_SIZE - 36];
 837         } __attribute__ ((packed)) *sdcal_area;
 838
 839         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 840         if (!sdcal_area)
 841                 return -ENOMEM;
 842         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 843         if (!dcal) {
 844                 ret = -ENOMEM;
 845                 goto out_free;
 846         }
 847         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 848                 ret = -EFAULT;
 849                 goto out_free;
 850         }
 851         sdcal_area->request.length = 0x0020;
 852         sdcal_area->request.code = 0x0034;
 853         sdcal_area->atype = dcal->req.atype;
 854         sdcal_area->fmt = dcal->req.fmt;
 855         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 856                sizeof(sdcal_area->list_parm));
 857
 858         ccode = chsc(sdcal_area);
 859         if (ccode != 0) {
 860                 ret = -EIO;
 861                 goto out_free;
 862         }
 863         if (sdcal_area->response.code != 0x0001) {
 864                 ret = -EIO;
 865                 CHSC_MSG(0, "sdcal: response code=%x\n",
 866                          sdcal_area->response.code);
 867                 goto out_free;
 868         }
 869         memcpy(&dcal->sdcal, &sdcal_area->response,
 870                sdcal_area->response.length);
 871         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 872                 ret = -EFAULT;
 873         else
 874                 ret = 0;
 875 out_free:
 876         kfree(dcal);
 877         free_page((unsigned long)sdcal_area);
 878         return ret;
 879 }
 880
 881 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 882                        unsigned long arg)
 883 {
 884         void __user *argp;
 885
 886         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 887         if (is_compat_task())
 888                 argp = compat_ptr(arg);
 889         else
 890                 argp = (void __user *)arg;
 891         switch (cmd) {
 892         case CHSC_START:
 893                 return chsc_ioctl_start(argp);
 894         case CHSC_START_SYNC:
 895                 return chsc_ioctl_start_sync(argp);
 896         case CHSC_INFO_CHANNEL_PATH:
 897                 return chsc_ioctl_info_channel_path(argp);
 898         case CHSC_INFO_CU:
 899                 return chsc_ioctl_info_cu(argp);
 900         case CHSC_INFO_SCH_CU:
 901                 return chsc_ioctl_info_sch_cu(argp);
 902         case CHSC_INFO_CI:
 903                 return chsc_ioctl_conf_info(argp);
 904         case CHSC_INFO_CCL:
 905                 return chsc_ioctl_conf_comp_list(argp);
 906         case CHSC_INFO_CPD:
 907                 return chsc_ioctl_chpd(argp);
 908         case CHSC_INFO_DCAL:
 909                 return chsc_ioctl_dcal(argp);
 910         case CHSC_ON_CLOSE_SET:
 911                 return chsc_ioctl_on_close_set(argp);
 912         case CHSC_ON_CLOSE_REMOVE:
 913                 return chsc_ioctl_on_close_remove();
 914         default: /* unknown ioctl number */
 915                 return -ENOIOCTLCMD;
 916         }
 917 }
 918
 919 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
 920
 921 static int chsc_open(struct inode *inode, struct file *file)
 922 {
 923         if (!atomic_dec_and_test(&chsc_ready_for_use)) {
 924                 atomic_inc(&chsc_ready_for_use);
 925                 return -EBUSY;
 926         }
 927         return nonseekable_open(inode, file);
 928 }
 929
 930 static int chsc_release(struct inode *inode, struct file *filp)
 931 {
 932         char dbf[13];
 933         int ret;
 934
 935         mutex_lock(&on_close_mutex);
 936         if (!on_close_chsc_area)
 937                 goto out_unlock;
 938         init_completion(&on_close_request->completion);
 939         CHSC_LOG(0, "on_close");
 940         chsc_log_command(on_close_chsc_area);
 941         spin_lock_irq(&chsc_lock);
 942         ret = chsc_async(on_close_chsc_area, on_close_request);
 943         spin_unlock_irq(&chsc_lock);
 944         if (ret == -EINPROGRESS) {
 945                 wait_for_completion(&on_close_request->completion);
 946                 ret = chsc_examine_irb(on_close_request);
 947         }
 948         snprintf(dbf, sizeof(dbf), "relret:%d", ret);
 949         CHSC_LOG(0, dbf);
 950         free_page((unsigned long)on_close_chsc_area);
 951         on_close_chsc_area = NULL;
 952         kfree(on_close_request);
 953         on_close_request = NULL;
 954 out_unlock:
 955         mutex_unlock(&on_close_mutex);
 956         atomic_inc(&chsc_ready_for_use);
 957         return 0;
 958 }
 959
 960 static const struct file_operations chsc_fops = {
 961         .owner = THIS_MODULE,
 962         .open = chsc_open,
 963         .release = chsc_release,
 964         .unlocked_ioctl = chsc_ioctl,
 965         .compat_ioctl = chsc_ioctl,
 966         .llseek = no_llseek,
 967 };
 968
 969 static struct miscdevice chsc_misc_device = {
 970         .minor = MISC_DYNAMIC_MINOR,
 971         .name = "chsc",
 972         .fops = &chsc_fops,
 973 };
 974
 975 static int __init chsc_misc_init(void)
 976 {
 977         return misc_register(&chsc_misc_device);
 978 }
 979
 980 static void chsc_misc_cleanup(void)
 981 {
 982         misc_deregister(&chsc_misc_device);
 983 }
 984
 985 static int __init chsc_sch_init(void)
 986 {
 987         int ret;
 988
 989         ret = chsc_init_dbfs();
 990         if (ret)
 991                 return ret;
 992         isc_register(CHSC_SCH_ISC);
 993         ret = chsc_init_sch_driver();
 994         if (ret)
 995                 goto out_dbf;
 996         ret = chsc_misc_init();
 997         if (ret)
 998                 goto out_driver;
 999         return ret;
1000 out_driver:
1001         chsc_cleanup_sch_driver();
1002 out_dbf:
1003         isc_unregister(CHSC_SCH_ISC);
1004         chsc_remove_dbfs();
1005         return ret;
1006 }
1007
1008 static void __exit chsc_sch_exit(void)
1009 {
1010         chsc_misc_cleanup();
1011         chsc_cleanup_sch_driver();
1012         isc_unregister(CHSC_SCH_ISC);
1013         chsc_remove_dbfs();
1014 }
1015
1016 module_init(chsc_sch_init);
1017 module_exit(chsc_sch_exit);