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