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 = (struct irb *)&S390_lowcore.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", 16, 1,
 177                                            16 * sizeof(long));
 178         if (!chsc_debug_msg_id)
 179                 goto out;
 180         debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
 181         debug_set_level(chsc_debug_msg_id, 2);
 182         chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
 183         if (!chsc_debug_log_id)
 184                 goto out;
 185         debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
 186         debug_set_level(chsc_debug_log_id, 2);
 187         return 0;
 188 out:
 189         if (chsc_debug_msg_id)
 190                 debug_unregister(chsc_debug_msg_id);
 191         return -ENOMEM;
 192 }
 193
 194 static void chsc_remove_dbfs(void)
 195 {
 196         debug_unregister(chsc_debug_log_id);
 197         debug_unregister(chsc_debug_msg_id);
 198 }
 199
 200 static int __init chsc_init_sch_driver(void)
 201 {
 202         return css_driver_register(&chsc_subchannel_driver);
 203 }
 204
 205 static void chsc_cleanup_sch_driver(void)
 206 {
 207         css_driver_unregister(&chsc_subchannel_driver);
 208 }
 209
 210 static DEFINE_SPINLOCK(chsc_lock);
 211
 212 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
 213 {
 214         struct subchannel *sch = to_subchannel(dev);
 215
 216         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 217 }
 218
 219 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 220 {
 221         struct device *dev;
 222
 223         dev = driver_find_device(&chsc_subchannel_driver.drv,
 224                                  sch ? &sch->dev : NULL, NULL,
 225                                  chsc_subchannel_match_next_free);
 226         return dev ? to_subchannel(dev) : NULL;
 227 }
 228
 229 /**
 230  * chsc_async() - try to start a chsc request asynchronously
 231  * @chsc_area: request to be started
 232  * @request: request structure to associate
 233  *
 234  * Tries to start a chsc request on one of the existing chsc subchannels.
 235  * Returns:
 236  *  %0 if the request was performed synchronously
 237  *  %-EINPROGRESS if the request was successfully started
 238  *  %-EBUSY if all chsc subchannels are busy
 239  *  %-ENODEV if no chsc subchannels are available
 240  * Context:
 241  *  interrupts disabled, chsc_lock held
 242  */
 243 static int chsc_async(struct chsc_async_area *chsc_area,
 244                       struct chsc_request *request)
 245 {
 246         int cc;
 247         struct chsc_private *private;
 248         struct subchannel *sch = NULL;
 249         int ret = -ENODEV;
 250         char dbf[10];
 251
 252         chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
 253         while ((sch = chsc_get_next_subchannel(sch))) {
 254                 spin_lock(sch->lock);
 255                 private = dev_get_drvdata(&sch->dev);
 256                 if (private->request) {
 257                         spin_unlock(sch->lock);
 258                         ret = -EBUSY;
 259                         continue;
 260                 }
 261                 chsc_area->header.sid = sch->schid;
 262                 CHSC_LOG(2, "schid");
 263                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 264                 cc = chsc(chsc_area);
 265                 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
 266                 CHSC_LOG(2, dbf);
 267                 switch (cc) {
 268                 case 0:
 269                         ret = 0;
 270                         break;
 271                 case 1:
 272                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 273                         ret = -EINPROGRESS;
 274                         private->request = request;
 275                         break;
 276                 case 2:
 277                         ret = -EBUSY;
 278                         break;
 279                 default:
 280                         ret = -ENODEV;
 281                 }
 282                 spin_unlock(sch->lock);
 283                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 284                          sch->schid.ssid, sch->schid.sch_no, cc);
 285                 if (ret == -EINPROGRESS)
 286                         return -EINPROGRESS;
 287                 put_device(&sch->dev);
 288                 if (ret == 0)
 289                         return 0;
 290         }
 291         return ret;
 292 }
 293
 294 static void chsc_log_command(void *chsc_area)
 295 {
 296         char dbf[10];
 297
 298         snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
 299         CHSC_LOG(0, dbf);
 300         CHSC_LOG_HEX(0, chsc_area, 32);
 301 }
 302
 303 static int chsc_examine_irb(struct chsc_request *request)
 304 {
 305         int backed_up;
 306
 307         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
 308                 return -EIO;
 309         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 310         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 311         if (scsw_cstat(&request->irb.scsw) == 0)
 312                 return 0;
 313         if (!backed_up)
 314                 return 0;
 315         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 316                 return -EIO;
 317         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 318                 return -EPERM;
 319         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 320                 return -EAGAIN;
 321         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 322                 return -EAGAIN;
 323         return -EIO;
 324 }
 325
 326 static int chsc_ioctl_start(void __user *user_area)
 327 {
 328         struct chsc_request *request;
 329         struct chsc_async_area *chsc_area;
 330         int ret;
 331         char dbf[10];
 332
 333         if (!css_general_characteristics.dynio)
 334                 /* It makes no sense to try. */
 335                 return -EOPNOTSUPP;
 336         chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 337         if (!chsc_area)
 338                 return -ENOMEM;
 339         request = kzalloc(sizeof(*request), GFP_KERNEL);
 340         if (!request) {
 341                 ret = -ENOMEM;
 342                 goto out_free;
 343         }
 344         init_completion(&request->completion);
 345         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 346                 ret = -EFAULT;
 347                 goto out_free;
 348         }
 349         chsc_log_command(chsc_area);
 350         spin_lock_irq(&chsc_lock);
 351         ret = chsc_async(chsc_area, request);
 352         spin_unlock_irq(&chsc_lock);
 353         if (ret == -EINPROGRESS) {
 354                 wait_for_completion(&request->completion);
 355                 ret = chsc_examine_irb(request);
 356         }
 357         /* copy area back to user */
 358         if (!ret)
 359                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 360                         ret = -EFAULT;
 361 out_free:
 362         snprintf(dbf, sizeof(dbf), "ret:%d", ret);
 363         CHSC_LOG(0, dbf);
 364         kfree(request);
 365         free_page((unsigned long)chsc_area);
 366         return ret;
 367 }
 368
 369 static int chsc_ioctl_on_close_set(void __user *user_area)
 370 {
 371         char dbf[13];
 372         int ret;
 373
 374         mutex_lock(&on_close_mutex);
 375         if (on_close_chsc_area) {
 376                 ret = -EBUSY;
 377                 goto out_unlock;
 378         }
 379         on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
 380         if (!on_close_request) {
 381                 ret = -ENOMEM;
 382                 goto out_unlock;
 383         }
 384         on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 385         if (!on_close_chsc_area) {
 386                 ret = -ENOMEM;
 387                 goto out_free_request;
 388         }
 389         if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
 390                 ret = -EFAULT;
 391                 goto out_free_chsc;
 392         }
 393         ret = 0;
 394         goto out_unlock;
 395
 396 out_free_chsc:
 397         free_page((unsigned long)on_close_chsc_area);
 398         on_close_chsc_area = NULL;
 399 out_free_request:
 400         kfree(on_close_request);
 401         on_close_request = NULL;
 402 out_unlock:
 403         mutex_unlock(&on_close_mutex);
 404         snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
 405         CHSC_LOG(0, dbf);
 406         return ret;
 407 }
 408
 409 static int chsc_ioctl_on_close_remove(void)
 410 {
 411         char dbf[13];
 412         int ret;
 413
 414         mutex_lock(&on_close_mutex);
 415         if (!on_close_chsc_area) {
 416                 ret = -ENOENT;
 417                 goto out_unlock;
 418         }
 419         free_page((unsigned long)on_close_chsc_area);
 420         on_close_chsc_area = NULL;
 421         kfree(on_close_request);
 422         on_close_request = NULL;
 423         ret = 0;
 424 out_unlock:
 425         mutex_unlock(&on_close_mutex);
 426         snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
 427         CHSC_LOG(0, dbf);
 428         return ret;
 429 }
 430
 431 static int chsc_ioctl_start_sync(void __user *user_area)
 432 {
 433         struct chsc_sync_area *chsc_area;
 434         int ret, ccode;
 435
 436         chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 437         if (!chsc_area)
 438                 return -ENOMEM;
 439         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 440                 ret = -EFAULT;
 441                 goto out_free;
 442         }
 443         if (chsc_area->header.code & 0x4000) {
 444                 ret = -EINVAL;
 445                 goto out_free;
 446         }
 447         chsc_log_command(chsc_area);
 448         ccode = chsc(chsc_area);
 449         if (ccode != 0) {
 450                 ret = -EIO;
 451                 goto out_free;
 452         }
 453         if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 454                 ret = -EFAULT;
 455         else
 456                 ret = 0;
 457 out_free:
 458         free_page((unsigned long)chsc_area);
 459         return ret;
 460 }
 461
 462 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 463 {
 464         struct chsc_chp_cd *cd;
 465         int ret, ccode;
 466         struct {
 467                 struct chsc_header request;
 468                 u32 : 2;
 469                 u32 m : 1;
 470                 u32 : 1;
 471                 u32 fmt1 : 4;
 472                 u32 cssid : 8;
 473                 u32 : 8;
 474                 u32 first_chpid : 8;
 475                 u32 : 24;
 476                 u32 last_chpid : 8;
 477                 u32 : 32;
 478                 struct chsc_header response;
 479                 u8 data[PAGE_SIZE - 20];
 480         } __attribute__ ((packed)) *scpcd_area;
 481
 482         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 483         if (!scpcd_area)
 484                 return -ENOMEM;
 485         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 486         if (!cd) {
 487                 ret = -ENOMEM;
 488                 goto out_free;
 489         }
 490         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 491                 ret = -EFAULT;
 492                 goto out_free;
 493         }
 494         scpcd_area->request.length = 0x0010;
 495         scpcd_area->request.code = 0x0028;
 496         scpcd_area->m = cd->m;
 497         scpcd_area->fmt1 = cd->fmt;
 498         scpcd_area->cssid = cd->chpid.cssid;
 499         scpcd_area->first_chpid = cd->chpid.id;
 500         scpcd_area->last_chpid = cd->chpid.id;
 501
 502         ccode = chsc(scpcd_area);
 503         if (ccode != 0) {
 504                 ret = -EIO;
 505                 goto out_free;
 506         }
 507         if (scpcd_area->response.code != 0x0001) {
 508                 ret = -EIO;
 509                 CHSC_MSG(0, "scpcd: response code=%x\n",
 510                          scpcd_area->response.code);
 511                 goto out_free;
 512         }
 513         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 514         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 515                 ret = -EFAULT;
 516         else
 517                 ret = 0;
 518 out_free:
 519         kfree(cd);
 520         free_page((unsigned long)scpcd_area);
 521         return ret;
 522 }
 523
 524 static int chsc_ioctl_info_cu(void __user *user_cd)
 525 {
 526         struct chsc_cu_cd *cd;
 527         int ret, ccode;
 528         struct {
 529                 struct chsc_header request;
 530                 u32 : 2;
 531                 u32 m : 1;
 532                 u32 : 1;
 533                 u32 fmt1 : 4;
 534                 u32 cssid : 8;
 535                 u32 : 8;
 536                 u32 first_cun : 8;
 537                 u32 : 24;
 538                 u32 last_cun : 8;
 539                 u32 : 32;
 540                 struct chsc_header response;
 541                 u8 data[PAGE_SIZE - 20];
 542         } __attribute__ ((packed)) *scucd_area;
 543
 544         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 545         if (!scucd_area)
 546                 return -ENOMEM;
 547         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 548         if (!cd) {
 549                 ret = -ENOMEM;
 550                 goto out_free;
 551         }
 552         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 553                 ret = -EFAULT;
 554                 goto out_free;
 555         }
 556         scucd_area->request.length = 0x0010;
 557         scucd_area->request.code = 0x0028;
 558         scucd_area->m = cd->m;
 559         scucd_area->fmt1 = cd->fmt;
 560         scucd_area->cssid = cd->cssid;
 561         scucd_area->first_cun = cd->cun;
 562         scucd_area->last_cun = cd->cun;
 563
 564         ccode = chsc(scucd_area);
 565         if (ccode != 0) {
 566                 ret = -EIO;
 567                 goto out_free;
 568         }
 569         if (scucd_area->response.code != 0x0001) {
 570                 ret = -EIO;
 571                 CHSC_MSG(0, "scucd: response code=%x\n",
 572                          scucd_area->response.code);
 573                 goto out_free;
 574         }
 575         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 576         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 577                 ret = -EFAULT;
 578         else
 579                 ret = 0;
 580 out_free:
 581         kfree(cd);
 582         free_page((unsigned long)scucd_area);
 583         return ret;
 584 }
 585
 586 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 587 {
 588         struct chsc_sch_cud *cud;
 589         int ret, ccode;
 590         struct {
 591                 struct chsc_header request;
 592                 u32 : 2;
 593                 u32 m : 1;
 594                 u32 : 5;
 595                 u32 fmt1 : 4;
 596                 u32 : 2;
 597                 u32 ssid : 2;
 598                 u32 first_sch : 16;
 599                 u32 : 8;
 600                 u32 cssid : 8;
 601                 u32 last_sch : 16;
 602                 u32 : 32;
 603                 struct chsc_header response;
 604                 u8 data[PAGE_SIZE - 20];
 605         } __attribute__ ((packed)) *sscud_area;
 606
 607         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 608         if (!sscud_area)
 609                 return -ENOMEM;
 610         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 611         if (!cud) {
 612                 ret = -ENOMEM;
 613                 goto out_free;
 614         }
 615         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 616                 ret = -EFAULT;
 617                 goto out_free;
 618         }
 619         sscud_area->request.length = 0x0010;
 620         sscud_area->request.code = 0x0006;
 621         sscud_area->m = cud->schid.m;
 622         sscud_area->fmt1 = cud->fmt;
 623         sscud_area->ssid = cud->schid.ssid;
 624         sscud_area->first_sch = cud->schid.sch_no;
 625         sscud_area->cssid = cud->schid.cssid;
 626         sscud_area->last_sch = cud->schid.sch_no;
 627
 628         ccode = chsc(sscud_area);
 629         if (ccode != 0) {
 630                 ret = -EIO;
 631                 goto out_free;
 632         }
 633         if (sscud_area->response.code != 0x0001) {
 634                 ret = -EIO;
 635                 CHSC_MSG(0, "sscud: response code=%x\n",
 636                          sscud_area->response.code);
 637                 goto out_free;
 638         }
 639         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 640         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 641                 ret = -EFAULT;
 642         else
 643                 ret = 0;
 644 out_free:
 645         kfree(cud);
 646         free_page((unsigned long)sscud_area);
 647         return ret;
 648 }
 649
 650 static int chsc_ioctl_conf_info(void __user *user_ci)
 651 {
 652         struct chsc_conf_info *ci;
 653         int ret, ccode;
 654         struct {
 655                 struct chsc_header request;
 656                 u32 : 2;
 657                 u32 m : 1;
 658                 u32 : 1;
 659                 u32 fmt1 : 4;
 660                 u32 cssid : 8;
 661                 u32 : 6;
 662                 u32 ssid : 2;
 663                 u32 : 8;
 664                 u64 : 64;
 665                 struct chsc_header response;
 666                 u8 data[PAGE_SIZE - 20];
 667         } __attribute__ ((packed)) *sci_area;
 668
 669         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 670         if (!sci_area)
 671                 return -ENOMEM;
 672         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 673         if (!ci) {
 674                 ret = -ENOMEM;
 675                 goto out_free;
 676         }
 677         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 678                 ret = -EFAULT;
 679                 goto out_free;
 680         }
 681         sci_area->request.length = 0x0010;
 682         sci_area->request.code = 0x0012;
 683         sci_area->m = ci->id.m;
 684         sci_area->fmt1 = ci->fmt;
 685         sci_area->cssid = ci->id.cssid;
 686         sci_area->ssid = ci->id.ssid;
 687
 688         ccode = chsc(sci_area);
 689         if (ccode != 0) {
 690                 ret = -EIO;
 691                 goto out_free;
 692         }
 693         if (sci_area->response.code != 0x0001) {
 694                 ret = -EIO;
 695                 CHSC_MSG(0, "sci: response code=%x\n",
 696                          sci_area->response.code);
 697                 goto out_free;
 698         }
 699         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 700         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 701                 ret = -EFAULT;
 702         else
 703                 ret = 0;
 704 out_free:
 705         kfree(ci);
 706         free_page((unsigned long)sci_area);
 707         return ret;
 708 }
 709
 710 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 711 {
 712         struct chsc_comp_list *ccl;
 713         int ret, ccode;
 714         struct {
 715                 struct chsc_header request;
 716                 u32 ctype : 8;
 717                 u32 : 4;
 718                 u32 fmt : 4;
 719                 u32 : 16;
 720                 u64 : 64;
 721                 u32 list_parm[2];
 722                 u64 : 64;
 723                 struct chsc_header response;
 724                 u8 data[PAGE_SIZE - 36];
 725         } __attribute__ ((packed)) *sccl_area;
 726         struct {
 727                 u32 m : 1;
 728                 u32 : 31;
 729                 u32 cssid : 8;
 730                 u32 : 16;
 731                 u32 chpid : 8;
 732         } __attribute__ ((packed)) *chpid_parm;
 733         struct {
 734                 u32 f_cssid : 8;
 735                 u32 l_cssid : 8;
 736                 u32 : 16;
 737                 u32 res;
 738         } __attribute__ ((packed)) *cssids_parm;
 739
 740         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 741         if (!sccl_area)
 742                 return -ENOMEM;
 743         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 744         if (!ccl) {
 745                 ret = -ENOMEM;
 746                 goto out_free;
 747         }
 748         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 749                 ret = -EFAULT;
 750                 goto out_free;
 751         }
 752         sccl_area->request.length = 0x0020;
 753         sccl_area->request.code = 0x0030;
 754         sccl_area->fmt = ccl->req.fmt;
 755         sccl_area->ctype = ccl->req.ctype;
 756         switch (sccl_area->ctype) {
 757         case CCL_CU_ON_CHP:
 758         case CCL_IOP_CHP:
 759                 chpid_parm = (void *)&sccl_area->list_parm;
 760                 chpid_parm->m = ccl->req.chpid.m;
 761                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 762                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 763                 break;
 764         case CCL_CSS_IMG:
 765         case CCL_CSS_IMG_CONF_CHAR:
 766                 cssids_parm = (void *)&sccl_area->list_parm;
 767                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 768                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 769                 break;
 770         }
 771         ccode = chsc(sccl_area);
 772         if (ccode != 0) {
 773                 ret = -EIO;
 774                 goto out_free;
 775         }
 776         if (sccl_area->response.code != 0x0001) {
 777                 ret = -EIO;
 778                 CHSC_MSG(0, "sccl: response code=%x\n",
 779                          sccl_area->response.code);
 780                 goto out_free;
 781         }
 782         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 783         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 784                 ret = -EFAULT;
 785         else
 786                 ret = 0;
 787 out_free:
 788         kfree(ccl);
 789         free_page((unsigned long)sccl_area);
 790         return ret;
 791 }
 792
 793 static int chsc_ioctl_chpd(void __user *user_chpd)
 794 {
 795         struct chsc_scpd *scpd_area;
 796         struct chsc_cpd_info *chpd;
 797         int ret;
 798
 799         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 800         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 801         if (!scpd_area || !chpd) {
 802                 ret = -ENOMEM;
 803                 goto out_free;
 804         }
 805         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 806                 ret = -EFAULT;
 807                 goto out_free;
 808         }
 809         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 810                                                chpd->rfmt, chpd->c, chpd->m,
 811                                                scpd_area);
 812         if (ret)
 813                 goto out_free;
 814         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 815         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 816                 ret = -EFAULT;
 817 out_free:
 818         kfree(chpd);
 819         free_page((unsigned long)scpd_area);
 820         return ret;
 821 }
 822
 823 static int chsc_ioctl_dcal(void __user *user_dcal)
 824 {
 825         struct chsc_dcal *dcal;
 826         int ret, ccode;
 827         struct {
 828                 struct chsc_header request;
 829                 u32 atype : 8;
 830                 u32 : 4;
 831                 u32 fmt : 4;
 832                 u32 : 16;
 833                 u32 res0[2];
 834                 u32 list_parm[2];
 835                 u32 res1[2];
 836                 struct chsc_header response;
 837                 u8 data[PAGE_SIZE - 36];
 838         } __attribute__ ((packed)) *sdcal_area;
 839
 840         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 841         if (!sdcal_area)
 842                 return -ENOMEM;
 843         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 844         if (!dcal) {
 845                 ret = -ENOMEM;
 846                 goto out_free;
 847         }
 848         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 849                 ret = -EFAULT;
 850                 goto out_free;
 851         }
 852         sdcal_area->request.length = 0x0020;
 853         sdcal_area->request.code = 0x0034;
 854         sdcal_area->atype = dcal->req.atype;
 855         sdcal_area->fmt = dcal->req.fmt;
 856         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 857                sizeof(sdcal_area->list_parm));
 858
 859         ccode = chsc(sdcal_area);
 860         if (ccode != 0) {
 861                 ret = -EIO;
 862                 goto out_free;
 863         }
 864         if (sdcal_area->response.code != 0x0001) {
 865                 ret = -EIO;
 866                 CHSC_MSG(0, "sdcal: response code=%x\n",
 867                          sdcal_area->response.code);
 868                 goto out_free;
 869         }
 870         memcpy(&dcal->sdcal, &sdcal_area->response,
 871                sdcal_area->response.length);
 872         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 873                 ret = -EFAULT;
 874         else
 875                 ret = 0;
 876 out_free:
 877         kfree(dcal);
 878         free_page((unsigned long)sdcal_area);
 879         return ret;
 880 }
 881
 882 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 883                        unsigned long arg)
 884 {
 885         void __user *argp;
 886
 887         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 888         if (is_compat_task())
 889                 argp = compat_ptr(arg);
 890         else
 891                 argp = (void __user *)arg;
 892         switch (cmd) {
 893         case CHSC_START:
 894                 return chsc_ioctl_start(argp);
 895         case CHSC_START_SYNC:
 896                 return chsc_ioctl_start_sync(argp);
 897         case CHSC_INFO_CHANNEL_PATH:
 898                 return chsc_ioctl_info_channel_path(argp);
 899         case CHSC_INFO_CU:
 900                 return chsc_ioctl_info_cu(argp);
 901         case CHSC_INFO_SCH_CU:
 902                 return chsc_ioctl_info_sch_cu(argp);
 903         case CHSC_INFO_CI:
 904                 return chsc_ioctl_conf_info(argp);
 905         case CHSC_INFO_CCL:
 906                 return chsc_ioctl_conf_comp_list(argp);
 907         case CHSC_INFO_CPD:
 908                 return chsc_ioctl_chpd(argp);
 909         case CHSC_INFO_DCAL:
 910                 return chsc_ioctl_dcal(argp);
 911         case CHSC_ON_CLOSE_SET:
 912                 return chsc_ioctl_on_close_set(argp);
 913         case CHSC_ON_CLOSE_REMOVE:
 914                 return chsc_ioctl_on_close_remove();
 915         default: /* unknown ioctl number */
 916                 return -ENOIOCTLCMD;
 917         }
 918 }
 919
 920 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
 921
 922 static int chsc_open(struct inode *inode, struct file *file)
 923 {
 924         if (!atomic_dec_and_test(&chsc_ready_for_use)) {
 925                 atomic_inc(&chsc_ready_for_use);
 926                 return -EBUSY;
 927         }
 928         return nonseekable_open(inode, file);
 929 }
 930
 931 static int chsc_release(struct inode *inode, struct file *filp)
 932 {
 933         char dbf[13];
 934         int ret;
 935
 936         mutex_lock(&on_close_mutex);
 937         if (!on_close_chsc_area)
 938                 goto out_unlock;
 939         init_completion(&on_close_request->completion);
 940         CHSC_LOG(0, "on_close");
 941         chsc_log_command(on_close_chsc_area);
 942         spin_lock_irq(&chsc_lock);
 943         ret = chsc_async(on_close_chsc_area, on_close_request);
 944         spin_unlock_irq(&chsc_lock);
 945         if (ret == -EINPROGRESS) {
 946                 wait_for_completion(&on_close_request->completion);
 947                 ret = chsc_examine_irb(on_close_request);
 948         }
 949         snprintf(dbf, sizeof(dbf), "relret:%d", ret);
 950         CHSC_LOG(0, dbf);
 951         free_page((unsigned long)on_close_chsc_area);
 952         on_close_chsc_area = NULL;
 953         kfree(on_close_request);
 954         on_close_request = NULL;
 955 out_unlock:
 956         mutex_unlock(&on_close_mutex);
 957         atomic_inc(&chsc_ready_for_use);
 958         return 0;
 959 }
 960
 961 static const struct file_operations chsc_fops = {
 962         .owner = THIS_MODULE,
 963         .open = chsc_open,
 964         .release = chsc_release,
 965         .unlocked_ioctl = chsc_ioctl,
 966         .compat_ioctl = chsc_ioctl,
 967         .llseek = no_llseek,
 968 };
 969
 970 static struct miscdevice chsc_misc_device = {
 971         .minor = MISC_DYNAMIC_MINOR,
 972         .name = "chsc",
 973         .fops = &chsc_fops,
 974 };
 975
 976 static int __init chsc_misc_init(void)
 977 {
 978         return misc_register(&chsc_misc_device);
 979 }
 980
 981 static void chsc_misc_cleanup(void)
 982 {
 983         misc_deregister(&chsc_misc_device);
 984 }
 985
 986 static int __init chsc_sch_init(void)
 987 {
 988         int ret;
 989
 990         ret = chsc_init_dbfs();
 991         if (ret)
 992                 return ret;
 993         isc_register(CHSC_SCH_ISC);
 994         ret = chsc_init_sch_driver();
 995         if (ret)
 996                 goto out_dbf;
 997         ret = chsc_misc_init();
 998         if (ret)
 999                 goto out_driver;
1000         return ret;
1001 out_driver:
1002         chsc_cleanup_sch_driver();
1003 out_dbf:
1004         isc_unregister(CHSC_SCH_ISC);
1005         chsc_remove_dbfs();
1006         return ret;
1007 }
1008
1009 static void __exit chsc_sch_exit(void)
1010 {
1011         chsc_misc_cleanup();
1012         chsc_cleanup_sch_driver();
1013         isc_unregister(CHSC_SCH_ISC);
1014         chsc_remove_dbfs();
1015 }
1016
1017 module_init(chsc_sch_init);
1018 module_exit(chsc_sch_exit);