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