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 #define CHSC_MSG(imp, args...) do {                                     \
  33                 debug_sprintf_event(chsc_debug_msg_id, imp , ##args);   \
  34         } while (0)
  35
  36 #define CHSC_LOG(imp, txt) do {                                 \
  37                 debug_text_event(chsc_debug_log_id, imp , txt); \
  38         } while (0)
  39
  40 static void CHSC_LOG_HEX(int level, void *data, int length)
  41 {
  42         while (length > 0) {
  43                 debug_event(chsc_debug_log_id, level, data, length);
  44                 length -= chsc_debug_log_id->buf_size;
  45                 data += chsc_debug_log_id->buf_size;
  46         }
  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 = (struct irb *)&S390_lowcore.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 int chsc_subchannel_prepare(struct subchannel *sch)
 124 {
 125         int cc;
 126         struct schib schib;
 127         /*
 128          * Don't allow suspend while the subchannel is not idle
 129          * since we don't have a way to clear the subchannel and
 130          * cannot disable it with a request running.
 131          */
 132         cc = stsch_err(sch->schid, &schib);
 133         if (!cc && scsw_stctl(&schib.scsw))
 134                 return -EAGAIN;
 135         return 0;
 136 }
 137
 138 static int chsc_subchannel_freeze(struct subchannel *sch)
 139 {
 140         return cio_disable_subchannel(sch);
 141 }
 142
 143 static int chsc_subchannel_restore(struct subchannel *sch)
 144 {
 145         return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
 146 }
 147
 148 static struct css_device_id chsc_subchannel_ids[] = {
 149         { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
 150         { /* end of list */ },
 151 };
 152 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
 153
 154 static struct css_driver chsc_subchannel_driver = {
 155         .drv = {
 156                 .owner = THIS_MODULE,
 157                 .name = "chsc_subchannel",
 158         },
 159         .subchannel_type = chsc_subchannel_ids,
 160         .irq = chsc_subchannel_irq,
 161         .probe = chsc_subchannel_probe,
 162         .remove = chsc_subchannel_remove,
 163         .shutdown = chsc_subchannel_shutdown,
 164         .prepare = chsc_subchannel_prepare,
 165         .freeze = chsc_subchannel_freeze,
 166         .thaw = chsc_subchannel_restore,
 167         .restore = chsc_subchannel_restore,
 168 };
 169
 170 static int __init chsc_init_dbfs(void)
 171 {
 172         chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
 173                                            16 * sizeof(long));
 174         if (!chsc_debug_msg_id)
 175                 goto out;
 176         debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
 177         debug_set_level(chsc_debug_msg_id, 2);
 178         chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
 179         if (!chsc_debug_log_id)
 180                 goto out;
 181         debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
 182         debug_set_level(chsc_debug_log_id, 2);
 183         return 0;
 184 out:
 185         if (chsc_debug_msg_id)
 186                 debug_unregister(chsc_debug_msg_id);
 187         return -ENOMEM;
 188 }
 189
 190 static void chsc_remove_dbfs(void)
 191 {
 192         debug_unregister(chsc_debug_log_id);
 193         debug_unregister(chsc_debug_msg_id);
 194 }
 195
 196 static int __init chsc_init_sch_driver(void)
 197 {
 198         return css_driver_register(&chsc_subchannel_driver);
 199 }
 200
 201 static void chsc_cleanup_sch_driver(void)
 202 {
 203         css_driver_unregister(&chsc_subchannel_driver);
 204 }
 205
 206 static DEFINE_SPINLOCK(chsc_lock);
 207
 208 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
 209 {
 210         struct subchannel *sch = to_subchannel(dev);
 211
 212         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 213 }
 214
 215 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 216 {
 217         struct device *dev;
 218
 219         dev = driver_find_device(&chsc_subchannel_driver.drv,
 220                                  sch ? &sch->dev : NULL, NULL,
 221                                  chsc_subchannel_match_next_free);
 222         return dev ? to_subchannel(dev) : NULL;
 223 }
 224
 225 /**
 226  * chsc_async() - try to start a chsc request asynchronously
 227  * @chsc_area: request to be started
 228  * @request: request structure to associate
 229  *
 230  * Tries to start a chsc request on one of the existing chsc subchannels.
 231  * Returns:
 232  *  %0 if the request was performed synchronously
 233  *  %-EINPROGRESS if the request was successfully started
 234  *  %-EBUSY if all chsc subchannels are busy
 235  *  %-ENODEV if no chsc subchannels are available
 236  * Context:
 237  *  interrupts disabled, chsc_lock held
 238  */
 239 static int chsc_async(struct chsc_async_area *chsc_area,
 240                       struct chsc_request *request)
 241 {
 242         int cc;
 243         struct chsc_private *private;
 244         struct subchannel *sch = NULL;
 245         int ret = -ENODEV;
 246         char dbf[10];
 247
 248         chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
 249         while ((sch = chsc_get_next_subchannel(sch))) {
 250                 spin_lock(sch->lock);
 251                 private = dev_get_drvdata(&sch->dev);
 252                 if (private->request) {
 253                         spin_unlock(sch->lock);
 254                         ret = -EBUSY;
 255                         continue;
 256                 }
 257                 chsc_area->header.sid = sch->schid;
 258                 CHSC_LOG(2, "schid");
 259                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 260                 cc = chsc(chsc_area);
 261                 sprintf(dbf, "cc:%d", cc);
 262                 CHSC_LOG(2, dbf);
 263                 switch (cc) {
 264                 case 0:
 265                         ret = 0;
 266                         break;
 267                 case 1:
 268                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 269                         ret = -EINPROGRESS;
 270                         private->request = request;
 271                         break;
 272                 case 2:
 273                         ret = -EBUSY;
 274                         break;
 275                 default:
 276                         ret = -ENODEV;
 277                 }
 278                 spin_unlock(sch->lock);
 279                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 280                          sch->schid.ssid, sch->schid.sch_no, cc);
 281                 if (ret == -EINPROGRESS)
 282                         return -EINPROGRESS;
 283                 put_device(&sch->dev);
 284                 if (ret == 0)
 285                         return 0;
 286         }
 287         return ret;
 288 }
 289
 290 static void chsc_log_command(void *chsc_area)
 291 {
 292         char dbf[10];
 293
 294         sprintf(dbf, "CHSC:%x", ((uint16_t *)chsc_area)[1]);
 295         CHSC_LOG(0, dbf);
 296         CHSC_LOG_HEX(0, chsc_area, 32);
 297 }
 298
 299 static int chsc_examine_irb(struct chsc_request *request)
 300 {
 301         int backed_up;
 302
 303         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
 304                 return -EIO;
 305         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 306         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 307         if (scsw_cstat(&request->irb.scsw) == 0)
 308                 return 0;
 309         if (!backed_up)
 310                 return 0;
 311         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 312                 return -EIO;
 313         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 314                 return -EPERM;
 315         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 316                 return -EAGAIN;
 317         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 318                 return -EAGAIN;
 319         return -EIO;
 320 }
 321
 322 static int chsc_ioctl_start(void __user *user_area)
 323 {
 324         struct chsc_request *request;
 325         struct chsc_async_area *chsc_area;
 326         int ret;
 327         char dbf[10];
 328
 329         if (!css_general_characteristics.dynio)
 330                 /* It makes no sense to try. */
 331                 return -EOPNOTSUPP;
 332         chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 333         if (!chsc_area)
 334                 return -ENOMEM;
 335         request = kzalloc(sizeof(*request), GFP_KERNEL);
 336         if (!request) {
 337                 ret = -ENOMEM;
 338                 goto out_free;
 339         }
 340         init_completion(&request->completion);
 341         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 342                 ret = -EFAULT;
 343                 goto out_free;
 344         }
 345         chsc_log_command(chsc_area);
 346         spin_lock_irq(&chsc_lock);
 347         ret = chsc_async(chsc_area, request);
 348         spin_unlock_irq(&chsc_lock);
 349         if (ret == -EINPROGRESS) {
 350                 wait_for_completion(&request->completion);
 351                 ret = chsc_examine_irb(request);
 352         }
 353         /* copy area back to user */
 354         if (!ret)
 355                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 356                         ret = -EFAULT;
 357 out_free:
 358         sprintf(dbf, "ret:%d", ret);
 359         CHSC_LOG(0, dbf);
 360         kfree(request);
 361         free_page((unsigned long)chsc_area);
 362         return ret;
 363 }
 364
 365 static int chsc_ioctl_start_sync(void __user *user_area)
 366 {
 367         struct chsc_sync_area *chsc_area;
 368         int ret, ccode;
 369
 370         chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 371         if (!chsc_area)
 372                 return -ENOMEM;
 373         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 374                 ret = -EFAULT;
 375                 goto out_free;
 376         }
 377         if (chsc_area->header.code & 0x4000) {
 378                 ret = -EINVAL;
 379                 goto out_free;
 380         }
 381         chsc_log_command(chsc_area);
 382         ccode = chsc(chsc_area);
 383         if (ccode != 0) {
 384                 ret = -EIO;
 385                 goto out_free;
 386         }
 387         if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 388                 ret = -EFAULT;
 389         else
 390                 ret = 0;
 391 out_free:
 392         free_page((unsigned long)chsc_area);
 393         return ret;
 394 }
 395
 396 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 397 {
 398         struct chsc_chp_cd *cd;
 399         int ret, ccode;
 400         struct {
 401                 struct chsc_header request;
 402                 u32 : 2;
 403                 u32 m : 1;
 404                 u32 : 1;
 405                 u32 fmt1 : 4;
 406                 u32 cssid : 8;
 407                 u32 : 8;
 408                 u32 first_chpid : 8;
 409                 u32 : 24;
 410                 u32 last_chpid : 8;
 411                 u32 : 32;
 412                 struct chsc_header response;
 413                 u8 data[PAGE_SIZE - 20];
 414         } __attribute__ ((packed)) *scpcd_area;
 415
 416         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 417         if (!scpcd_area)
 418                 return -ENOMEM;
 419         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 420         if (!cd) {
 421                 ret = -ENOMEM;
 422                 goto out_free;
 423         }
 424         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 425                 ret = -EFAULT;
 426                 goto out_free;
 427         }
 428         scpcd_area->request.length = 0x0010;
 429         scpcd_area->request.code = 0x0028;
 430         scpcd_area->m = cd->m;
 431         scpcd_area->fmt1 = cd->fmt;
 432         scpcd_area->cssid = cd->chpid.cssid;
 433         scpcd_area->first_chpid = cd->chpid.id;
 434         scpcd_area->last_chpid = cd->chpid.id;
 435
 436         ccode = chsc(scpcd_area);
 437         if (ccode != 0) {
 438                 ret = -EIO;
 439                 goto out_free;
 440         }
 441         if (scpcd_area->response.code != 0x0001) {
 442                 ret = -EIO;
 443                 CHSC_MSG(0, "scpcd: response code=%x\n",
 444                          scpcd_area->response.code);
 445                 goto out_free;
 446         }
 447         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 448         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 449                 ret = -EFAULT;
 450         else
 451                 ret = 0;
 452 out_free:
 453         kfree(cd);
 454         free_page((unsigned long)scpcd_area);
 455         return ret;
 456 }
 457
 458 static int chsc_ioctl_info_cu(void __user *user_cd)
 459 {
 460         struct chsc_cu_cd *cd;
 461         int ret, ccode;
 462         struct {
 463                 struct chsc_header request;
 464                 u32 : 2;
 465                 u32 m : 1;
 466                 u32 : 1;
 467                 u32 fmt1 : 4;
 468                 u32 cssid : 8;
 469                 u32 : 8;
 470                 u32 first_cun : 8;
 471                 u32 : 24;
 472                 u32 last_cun : 8;
 473                 u32 : 32;
 474                 struct chsc_header response;
 475                 u8 data[PAGE_SIZE - 20];
 476         } __attribute__ ((packed)) *scucd_area;
 477
 478         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 479         if (!scucd_area)
 480                 return -ENOMEM;
 481         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 482         if (!cd) {
 483                 ret = -ENOMEM;
 484                 goto out_free;
 485         }
 486         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 487                 ret = -EFAULT;
 488                 goto out_free;
 489         }
 490         scucd_area->request.length = 0x0010;
 491         scucd_area->request.code = 0x0028;
 492         scucd_area->m = cd->m;
 493         scucd_area->fmt1 = cd->fmt;
 494         scucd_area->cssid = cd->cssid;
 495         scucd_area->first_cun = cd->cun;
 496         scucd_area->last_cun = cd->cun;
 497
 498         ccode = chsc(scucd_area);
 499         if (ccode != 0) {
 500                 ret = -EIO;
 501                 goto out_free;
 502         }
 503         if (scucd_area->response.code != 0x0001) {
 504                 ret = -EIO;
 505                 CHSC_MSG(0, "scucd: response code=%x\n",
 506                          scucd_area->response.code);
 507                 goto out_free;
 508         }
 509         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 510         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 511                 ret = -EFAULT;
 512         else
 513                 ret = 0;
 514 out_free:
 515         kfree(cd);
 516         free_page((unsigned long)scucd_area);
 517         return ret;
 518 }
 519
 520 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 521 {
 522         struct chsc_sch_cud *cud;
 523         int ret, ccode;
 524         struct {
 525                 struct chsc_header request;
 526                 u32 : 2;
 527                 u32 m : 1;
 528                 u32 : 5;
 529                 u32 fmt1 : 4;
 530                 u32 : 2;
 531                 u32 ssid : 2;
 532                 u32 first_sch : 16;
 533                 u32 : 8;
 534                 u32 cssid : 8;
 535                 u32 last_sch : 16;
 536                 u32 : 32;
 537                 struct chsc_header response;
 538                 u8 data[PAGE_SIZE - 20];
 539         } __attribute__ ((packed)) *sscud_area;
 540
 541         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 542         if (!sscud_area)
 543                 return -ENOMEM;
 544         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 545         if (!cud) {
 546                 ret = -ENOMEM;
 547                 goto out_free;
 548         }
 549         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 550                 ret = -EFAULT;
 551                 goto out_free;
 552         }
 553         sscud_area->request.length = 0x0010;
 554         sscud_area->request.code = 0x0006;
 555         sscud_area->m = cud->schid.m;
 556         sscud_area->fmt1 = cud->fmt;
 557         sscud_area->ssid = cud->schid.ssid;
 558         sscud_area->first_sch = cud->schid.sch_no;
 559         sscud_area->cssid = cud->schid.cssid;
 560         sscud_area->last_sch = cud->schid.sch_no;
 561
 562         ccode = chsc(sscud_area);
 563         if (ccode != 0) {
 564                 ret = -EIO;
 565                 goto out_free;
 566         }
 567         if (sscud_area->response.code != 0x0001) {
 568                 ret = -EIO;
 569                 CHSC_MSG(0, "sscud: response code=%x\n",
 570                          sscud_area->response.code);
 571                 goto out_free;
 572         }
 573         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 574         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 575                 ret = -EFAULT;
 576         else
 577                 ret = 0;
 578 out_free:
 579         kfree(cud);
 580         free_page((unsigned long)sscud_area);
 581         return ret;
 582 }
 583
 584 static int chsc_ioctl_conf_info(void __user *user_ci)
 585 {
 586         struct chsc_conf_info *ci;
 587         int ret, ccode;
 588         struct {
 589                 struct chsc_header request;
 590                 u32 : 2;
 591                 u32 m : 1;
 592                 u32 : 1;
 593                 u32 fmt1 : 4;
 594                 u32 cssid : 8;
 595                 u32 : 6;
 596                 u32 ssid : 2;
 597                 u32 : 8;
 598                 u64 : 64;
 599                 struct chsc_header response;
 600                 u8 data[PAGE_SIZE - 20];
 601         } __attribute__ ((packed)) *sci_area;
 602
 603         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 604         if (!sci_area)
 605                 return -ENOMEM;
 606         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 607         if (!ci) {
 608                 ret = -ENOMEM;
 609                 goto out_free;
 610         }
 611         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 612                 ret = -EFAULT;
 613                 goto out_free;
 614         }
 615         sci_area->request.length = 0x0010;
 616         sci_area->request.code = 0x0012;
 617         sci_area->m = ci->id.m;
 618         sci_area->fmt1 = ci->fmt;
 619         sci_area->cssid = ci->id.cssid;
 620         sci_area->ssid = ci->id.ssid;
 621
 622         ccode = chsc(sci_area);
 623         if (ccode != 0) {
 624                 ret = -EIO;
 625                 goto out_free;
 626         }
 627         if (sci_area->response.code != 0x0001) {
 628                 ret = -EIO;
 629                 CHSC_MSG(0, "sci: response code=%x\n",
 630                          sci_area->response.code);
 631                 goto out_free;
 632         }
 633         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 634         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 635                 ret = -EFAULT;
 636         else
 637                 ret = 0;
 638 out_free:
 639         kfree(ci);
 640         free_page((unsigned long)sci_area);
 641         return ret;
 642 }
 643
 644 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 645 {
 646         struct chsc_comp_list *ccl;
 647         int ret, ccode;
 648         struct {
 649                 struct chsc_header request;
 650                 u32 ctype : 8;
 651                 u32 : 4;
 652                 u32 fmt : 4;
 653                 u32 : 16;
 654                 u64 : 64;
 655                 u32 list_parm[2];
 656                 u64 : 64;
 657                 struct chsc_header response;
 658                 u8 data[PAGE_SIZE - 36];
 659         } __attribute__ ((packed)) *sccl_area;
 660         struct {
 661                 u32 m : 1;
 662                 u32 : 31;
 663                 u32 cssid : 8;
 664                 u32 : 16;
 665                 u32 chpid : 8;
 666         } __attribute__ ((packed)) *chpid_parm;
 667         struct {
 668                 u32 f_cssid : 8;
 669                 u32 l_cssid : 8;
 670                 u32 : 16;
 671                 u32 res;
 672         } __attribute__ ((packed)) *cssids_parm;
 673
 674         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 675         if (!sccl_area)
 676                 return -ENOMEM;
 677         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 678         if (!ccl) {
 679                 ret = -ENOMEM;
 680                 goto out_free;
 681         }
 682         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 683                 ret = -EFAULT;
 684                 goto out_free;
 685         }
 686         sccl_area->request.length = 0x0020;
 687         sccl_area->request.code = 0x0030;
 688         sccl_area->fmt = ccl->req.fmt;
 689         sccl_area->ctype = ccl->req.ctype;
 690         switch (sccl_area->ctype) {
 691         case CCL_CU_ON_CHP:
 692         case CCL_IOP_CHP:
 693                 chpid_parm = (void *)&sccl_area->list_parm;
 694                 chpid_parm->m = ccl->req.chpid.m;
 695                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 696                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 697                 break;
 698         case CCL_CSS_IMG:
 699         case CCL_CSS_IMG_CONF_CHAR:
 700                 cssids_parm = (void *)&sccl_area->list_parm;
 701                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 702                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 703                 break;
 704         }
 705         ccode = chsc(sccl_area);
 706         if (ccode != 0) {
 707                 ret = -EIO;
 708                 goto out_free;
 709         }
 710         if (sccl_area->response.code != 0x0001) {
 711                 ret = -EIO;
 712                 CHSC_MSG(0, "sccl: response code=%x\n",
 713                          sccl_area->response.code);
 714                 goto out_free;
 715         }
 716         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 717         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 718                 ret = -EFAULT;
 719         else
 720                 ret = 0;
 721 out_free:
 722         kfree(ccl);
 723         free_page((unsigned long)sccl_area);
 724         return ret;
 725 }
 726
 727 static int chsc_ioctl_chpd(void __user *user_chpd)
 728 {
 729         struct chsc_scpd *scpd_area;
 730         struct chsc_cpd_info *chpd;
 731         int ret;
 732
 733         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 734         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 735         if (!scpd_area || !chpd) {
 736                 ret = -ENOMEM;
 737                 goto out_free;
 738         }
 739         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 740                 ret = -EFAULT;
 741                 goto out_free;
 742         }
 743         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 744                                                chpd->rfmt, chpd->c, chpd->m,
 745                                                scpd_area);
 746         if (ret)
 747                 goto out_free;
 748         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 749         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 750                 ret = -EFAULT;
 751 out_free:
 752         kfree(chpd);
 753         free_page((unsigned long)scpd_area);
 754         return ret;
 755 }
 756
 757 static int chsc_ioctl_dcal(void __user *user_dcal)
 758 {
 759         struct chsc_dcal *dcal;
 760         int ret, ccode;
 761         struct {
 762                 struct chsc_header request;
 763                 u32 atype : 8;
 764                 u32 : 4;
 765                 u32 fmt : 4;
 766                 u32 : 16;
 767                 u32 res0[2];
 768                 u32 list_parm[2];
 769                 u32 res1[2];
 770                 struct chsc_header response;
 771                 u8 data[PAGE_SIZE - 36];
 772         } __attribute__ ((packed)) *sdcal_area;
 773
 774         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 775         if (!sdcal_area)
 776                 return -ENOMEM;
 777         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 778         if (!dcal) {
 779                 ret = -ENOMEM;
 780                 goto out_free;
 781         }
 782         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 783                 ret = -EFAULT;
 784                 goto out_free;
 785         }
 786         sdcal_area->request.length = 0x0020;
 787         sdcal_area->request.code = 0x0034;
 788         sdcal_area->atype = dcal->req.atype;
 789         sdcal_area->fmt = dcal->req.fmt;
 790         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 791                sizeof(sdcal_area->list_parm));
 792
 793         ccode = chsc(sdcal_area);
 794         if (ccode != 0) {
 795                 ret = -EIO;
 796                 goto out_free;
 797         }
 798         if (sdcal_area->response.code != 0x0001) {
 799                 ret = -EIO;
 800                 CHSC_MSG(0, "sdcal: response code=%x\n",
 801                          sdcal_area->response.code);
 802                 goto out_free;
 803         }
 804         memcpy(&dcal->sdcal, &sdcal_area->response,
 805                sdcal_area->response.length);
 806         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 807                 ret = -EFAULT;
 808         else
 809                 ret = 0;
 810 out_free:
 811         kfree(dcal);
 812         free_page((unsigned long)sdcal_area);
 813         return ret;
 814 }
 815
 816 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 817                        unsigned long arg)
 818 {
 819         void __user *argp;
 820
 821         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 822         if (is_compat_task())
 823                 argp = compat_ptr(arg);
 824         else
 825                 argp = (void __user *)arg;
 826         switch (cmd) {
 827         case CHSC_START:
 828                 return chsc_ioctl_start(argp);
 829         case CHSC_START_SYNC:
 830                 return chsc_ioctl_start_sync(argp);
 831         case CHSC_INFO_CHANNEL_PATH:
 832                 return chsc_ioctl_info_channel_path(argp);
 833         case CHSC_INFO_CU:
 834                 return chsc_ioctl_info_cu(argp);
 835         case CHSC_INFO_SCH_CU:
 836                 return chsc_ioctl_info_sch_cu(argp);
 837         case CHSC_INFO_CI:
 838                 return chsc_ioctl_conf_info(argp);
 839         case CHSC_INFO_CCL:
 840                 return chsc_ioctl_conf_comp_list(argp);
 841         case CHSC_INFO_CPD:
 842                 return chsc_ioctl_chpd(argp);
 843         case CHSC_INFO_DCAL:
 844                 return chsc_ioctl_dcal(argp);
 845         default: /* unknown ioctl number */
 846                 return -ENOIOCTLCMD;
 847         }
 848 }
 849
 850 static const struct file_operations chsc_fops = {
 851         .owner = THIS_MODULE,
 852         .open = nonseekable_open,
 853         .unlocked_ioctl = chsc_ioctl,
 854         .compat_ioctl = chsc_ioctl,
 855         .llseek = no_llseek,
 856 };
 857
 858 static struct miscdevice chsc_misc_device = {
 859         .minor = MISC_DYNAMIC_MINOR,
 860         .name = "chsc",
 861         .fops = &chsc_fops,
 862 };
 863
 864 static int __init chsc_misc_init(void)
 865 {
 866         return misc_register(&chsc_misc_device);
 867 }
 868
 869 static void chsc_misc_cleanup(void)
 870 {
 871         misc_deregister(&chsc_misc_device);
 872 }
 873
 874 static int __init chsc_sch_init(void)
 875 {
 876         int ret;
 877
 878         ret = chsc_init_dbfs();
 879         if (ret)
 880                 return ret;
 881         isc_register(CHSC_SCH_ISC);
 882         ret = chsc_init_sch_driver();
 883         if (ret)
 884                 goto out_dbf;
 885         ret = chsc_misc_init();
 886         if (ret)
 887                 goto out_driver;
 888         return ret;
 889 out_driver:
 890         chsc_cleanup_sch_driver();
 891 out_dbf:
 892         isc_unregister(CHSC_SCH_ISC);
 893         chsc_remove_dbfs();
 894         return ret;
 895 }
 896
 897 static void __exit chsc_sch_exit(void)
 898 {
 899         chsc_misc_cleanup();
 900         chsc_cleanup_sch_driver();
 901         isc_unregister(CHSC_SCH_ISC);
 902         chsc_remove_dbfs();
 903 }
 904
 905 module_init(chsc_sch_init);
 906 module_exit(chsc_sch_exit);