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         kstat_cpu(smp_processor_id()).irqs[IOINT_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(struct chsc_async_area *chsc_area)
 291 {
 292         char dbf[10];
 293
 294         sprintf(dbf, "CHSC:%x", chsc_area->header.code);
 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_info_channel_path(void __user *user_cd)
 366 {
 367         struct chsc_chp_cd *cd;
 368         int ret, ccode;
 369         struct {
 370                 struct chsc_header request;
 371                 u32 : 2;
 372                 u32 m : 1;
 373                 u32 : 1;
 374                 u32 fmt1 : 4;
 375                 u32 cssid : 8;
 376                 u32 : 8;
 377                 u32 first_chpid : 8;
 378                 u32 : 24;
 379                 u32 last_chpid : 8;
 380                 u32 : 32;
 381                 struct chsc_header response;
 382                 u8 data[PAGE_SIZE - 20];
 383         } __attribute__ ((packed)) *scpcd_area;
 384
 385         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 386         if (!scpcd_area)
 387                 return -ENOMEM;
 388         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 389         if (!cd) {
 390                 ret = -ENOMEM;
 391                 goto out_free;
 392         }
 393         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 394                 ret = -EFAULT;
 395                 goto out_free;
 396         }
 397         scpcd_area->request.length = 0x0010;
 398         scpcd_area->request.code = 0x0028;
 399         scpcd_area->m = cd->m;
 400         scpcd_area->fmt1 = cd->fmt;
 401         scpcd_area->cssid = cd->chpid.cssid;
 402         scpcd_area->first_chpid = cd->chpid.id;
 403         scpcd_area->last_chpid = cd->chpid.id;
 404
 405         ccode = chsc(scpcd_area);
 406         if (ccode != 0) {
 407                 ret = -EIO;
 408                 goto out_free;
 409         }
 410         if (scpcd_area->response.code != 0x0001) {
 411                 ret = -EIO;
 412                 CHSC_MSG(0, "scpcd: response code=%x\n",
 413                          scpcd_area->response.code);
 414                 goto out_free;
 415         }
 416         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 417         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 418                 ret = -EFAULT;
 419         else
 420                 ret = 0;
 421 out_free:
 422         kfree(cd);
 423         free_page((unsigned long)scpcd_area);
 424         return ret;
 425 }
 426
 427 static int chsc_ioctl_info_cu(void __user *user_cd)
 428 {
 429         struct chsc_cu_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_cun : 8;
 440                 u32 : 24;
 441                 u32 last_cun : 8;
 442                 u32 : 32;
 443                 struct chsc_header response;
 444                 u8 data[PAGE_SIZE - 20];
 445         } __attribute__ ((packed)) *scucd_area;
 446
 447         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 448         if (!scucd_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         scucd_area->request.length = 0x0010;
 460         scucd_area->request.code = 0x0028;
 461         scucd_area->m = cd->m;
 462         scucd_area->fmt1 = cd->fmt;
 463         scucd_area->cssid = cd->cssid;
 464         scucd_area->first_cun = cd->cun;
 465         scucd_area->last_cun = cd->cun;
 466
 467         ccode = chsc(scucd_area);
 468         if (ccode != 0) {
 469                 ret = -EIO;
 470                 goto out_free;
 471         }
 472         if (scucd_area->response.code != 0x0001) {
 473                 ret = -EIO;
 474                 CHSC_MSG(0, "scucd: response code=%x\n",
 475                          scucd_area->response.code);
 476                 goto out_free;
 477         }
 478         memcpy(&cd->cucb, &scucd_area->response, scucd_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)scucd_area);
 486         return ret;
 487 }
 488
 489 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 490 {
 491         struct chsc_sch_cud *cud;
 492         int ret, ccode;
 493         struct {
 494                 struct chsc_header request;
 495                 u32 : 2;
 496                 u32 m : 1;
 497                 u32 : 5;
 498                 u32 fmt1 : 4;
 499                 u32 : 2;
 500                 u32 ssid : 2;
 501                 u32 first_sch : 16;
 502                 u32 : 8;
 503                 u32 cssid : 8;
 504                 u32 last_sch : 16;
 505                 u32 : 32;
 506                 struct chsc_header response;
 507                 u8 data[PAGE_SIZE - 20];
 508         } __attribute__ ((packed)) *sscud_area;
 509
 510         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 511         if (!sscud_area)
 512                 return -ENOMEM;
 513         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 514         if (!cud) {
 515                 ret = -ENOMEM;
 516                 goto out_free;
 517         }
 518         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 519                 ret = -EFAULT;
 520                 goto out_free;
 521         }
 522         sscud_area->request.length = 0x0010;
 523         sscud_area->request.code = 0x0006;
 524         sscud_area->m = cud->schid.m;
 525         sscud_area->fmt1 = cud->fmt;
 526         sscud_area->ssid = cud->schid.ssid;
 527         sscud_area->first_sch = cud->schid.sch_no;
 528         sscud_area->cssid = cud->schid.cssid;
 529         sscud_area->last_sch = cud->schid.sch_no;
 530
 531         ccode = chsc(sscud_area);
 532         if (ccode != 0) {
 533                 ret = -EIO;
 534                 goto out_free;
 535         }
 536         if (sscud_area->response.code != 0x0001) {
 537                 ret = -EIO;
 538                 CHSC_MSG(0, "sscud: response code=%x\n",
 539                          sscud_area->response.code);
 540                 goto out_free;
 541         }
 542         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 543         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 544                 ret = -EFAULT;
 545         else
 546                 ret = 0;
 547 out_free:
 548         kfree(cud);
 549         free_page((unsigned long)sscud_area);
 550         return ret;
 551 }
 552
 553 static int chsc_ioctl_conf_info(void __user *user_ci)
 554 {
 555         struct chsc_conf_info *ci;
 556         int ret, ccode;
 557         struct {
 558                 struct chsc_header request;
 559                 u32 : 2;
 560                 u32 m : 1;
 561                 u32 : 1;
 562                 u32 fmt1 : 4;
 563                 u32 cssid : 8;
 564                 u32 : 6;
 565                 u32 ssid : 2;
 566                 u32 : 8;
 567                 u64 : 64;
 568                 struct chsc_header response;
 569                 u8 data[PAGE_SIZE - 20];
 570         } __attribute__ ((packed)) *sci_area;
 571
 572         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 573         if (!sci_area)
 574                 return -ENOMEM;
 575         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 576         if (!ci) {
 577                 ret = -ENOMEM;
 578                 goto out_free;
 579         }
 580         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 581                 ret = -EFAULT;
 582                 goto out_free;
 583         }
 584         sci_area->request.length = 0x0010;
 585         sci_area->request.code = 0x0012;
 586         sci_area->m = ci->id.m;
 587         sci_area->fmt1 = ci->fmt;
 588         sci_area->cssid = ci->id.cssid;
 589         sci_area->ssid = ci->id.ssid;
 590
 591         ccode = chsc(sci_area);
 592         if (ccode != 0) {
 593                 ret = -EIO;
 594                 goto out_free;
 595         }
 596         if (sci_area->response.code != 0x0001) {
 597                 ret = -EIO;
 598                 CHSC_MSG(0, "sci: response code=%x\n",
 599                          sci_area->response.code);
 600                 goto out_free;
 601         }
 602         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 603         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 604                 ret = -EFAULT;
 605         else
 606                 ret = 0;
 607 out_free:
 608         kfree(ci);
 609         free_page((unsigned long)sci_area);
 610         return ret;
 611 }
 612
 613 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 614 {
 615         struct chsc_comp_list *ccl;
 616         int ret, ccode;
 617         struct {
 618                 struct chsc_header request;
 619                 u32 ctype : 8;
 620                 u32 : 4;
 621                 u32 fmt : 4;
 622                 u32 : 16;
 623                 u64 : 64;
 624                 u32 list_parm[2];
 625                 u64 : 64;
 626                 struct chsc_header response;
 627                 u8 data[PAGE_SIZE - 36];
 628         } __attribute__ ((packed)) *sccl_area;
 629         struct {
 630                 u32 m : 1;
 631                 u32 : 31;
 632                 u32 cssid : 8;
 633                 u32 : 16;
 634                 u32 chpid : 8;
 635         } __attribute__ ((packed)) *chpid_parm;
 636         struct {
 637                 u32 f_cssid : 8;
 638                 u32 l_cssid : 8;
 639                 u32 : 16;
 640                 u32 res;
 641         } __attribute__ ((packed)) *cssids_parm;
 642
 643         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 644         if (!sccl_area)
 645                 return -ENOMEM;
 646         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 647         if (!ccl) {
 648                 ret = -ENOMEM;
 649                 goto out_free;
 650         }
 651         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 652                 ret = -EFAULT;
 653                 goto out_free;
 654         }
 655         sccl_area->request.length = 0x0020;
 656         sccl_area->request.code = 0x0030;
 657         sccl_area->fmt = ccl->req.fmt;
 658         sccl_area->ctype = ccl->req.ctype;
 659         switch (sccl_area->ctype) {
 660         case CCL_CU_ON_CHP:
 661         case CCL_IOP_CHP:
 662                 chpid_parm = (void *)&sccl_area->list_parm;
 663                 chpid_parm->m = ccl->req.chpid.m;
 664                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 665                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 666                 break;
 667         case CCL_CSS_IMG:
 668         case CCL_CSS_IMG_CONF_CHAR:
 669                 cssids_parm = (void *)&sccl_area->list_parm;
 670                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 671                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 672                 break;
 673         }
 674         ccode = chsc(sccl_area);
 675         if (ccode != 0) {
 676                 ret = -EIO;
 677                 goto out_free;
 678         }
 679         if (sccl_area->response.code != 0x0001) {
 680                 ret = -EIO;
 681                 CHSC_MSG(0, "sccl: response code=%x\n",
 682                          sccl_area->response.code);
 683                 goto out_free;
 684         }
 685         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 686         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 687                 ret = -EFAULT;
 688         else
 689                 ret = 0;
 690 out_free:
 691         kfree(ccl);
 692         free_page((unsigned long)sccl_area);
 693         return ret;
 694 }
 695
 696 static int chsc_ioctl_chpd(void __user *user_chpd)
 697 {
 698         struct chsc_scpd *scpd_area;
 699         struct chsc_cpd_info *chpd;
 700         int ret;
 701
 702         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 703         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 704         if (!scpd_area || !chpd) {
 705                 ret = -ENOMEM;
 706                 goto out_free;
 707         }
 708         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 709                 ret = -EFAULT;
 710                 goto out_free;
 711         }
 712         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 713                                                chpd->rfmt, chpd->c, chpd->m,
 714                                                scpd_area);
 715         if (ret)
 716                 goto out_free;
 717         memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 718         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 719                 ret = -EFAULT;
 720 out_free:
 721         kfree(chpd);
 722         free_page((unsigned long)scpd_area);
 723         return ret;
 724 }
 725
 726 static int chsc_ioctl_dcal(void __user *user_dcal)
 727 {
 728         struct chsc_dcal *dcal;
 729         int ret, ccode;
 730         struct {
 731                 struct chsc_header request;
 732                 u32 atype : 8;
 733                 u32 : 4;
 734                 u32 fmt : 4;
 735                 u32 : 16;
 736                 u32 res0[2];
 737                 u32 list_parm[2];
 738                 u32 res1[2];
 739                 struct chsc_header response;
 740                 u8 data[PAGE_SIZE - 36];
 741         } __attribute__ ((packed)) *sdcal_area;
 742
 743         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 744         if (!sdcal_area)
 745                 return -ENOMEM;
 746         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 747         if (!dcal) {
 748                 ret = -ENOMEM;
 749                 goto out_free;
 750         }
 751         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 752                 ret = -EFAULT;
 753                 goto out_free;
 754         }
 755         sdcal_area->request.length = 0x0020;
 756         sdcal_area->request.code = 0x0034;
 757         sdcal_area->atype = dcal->req.atype;
 758         sdcal_area->fmt = dcal->req.fmt;
 759         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 760                sizeof(sdcal_area->list_parm));
 761
 762         ccode = chsc(sdcal_area);
 763         if (ccode != 0) {
 764                 ret = -EIO;
 765                 goto out_free;
 766         }
 767         if (sdcal_area->response.code != 0x0001) {
 768                 ret = -EIO;
 769                 CHSC_MSG(0, "sdcal: response code=%x\n",
 770                          sdcal_area->response.code);
 771                 goto out_free;
 772         }
 773         memcpy(&dcal->sdcal, &sdcal_area->response,
 774                sdcal_area->response.length);
 775         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 776                 ret = -EFAULT;
 777         else
 778                 ret = 0;
 779 out_free:
 780         kfree(dcal);
 781         free_page((unsigned long)sdcal_area);
 782         return ret;
 783 }
 784
 785 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 786                        unsigned long arg)
 787 {
 788         void __user *argp;
 789
 790         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 791         if (is_compat_task())
 792                 argp = compat_ptr(arg);
 793         else
 794                 argp = (void __user *)arg;
 795         switch (cmd) {
 796         case CHSC_START:
 797                 return chsc_ioctl_start(argp);
 798         case CHSC_INFO_CHANNEL_PATH:
 799                 return chsc_ioctl_info_channel_path(argp);
 800         case CHSC_INFO_CU:
 801                 return chsc_ioctl_info_cu(argp);
 802         case CHSC_INFO_SCH_CU:
 803                 return chsc_ioctl_info_sch_cu(argp);
 804         case CHSC_INFO_CI:
 805                 return chsc_ioctl_conf_info(argp);
 806         case CHSC_INFO_CCL:
 807                 return chsc_ioctl_conf_comp_list(argp);
 808         case CHSC_INFO_CPD:
 809                 return chsc_ioctl_chpd(argp);
 810         case CHSC_INFO_DCAL:
 811                 return chsc_ioctl_dcal(argp);
 812         default: /* unknown ioctl number */
 813                 return -ENOIOCTLCMD;
 814         }
 815 }
 816
 817 static const struct file_operations chsc_fops = {
 818         .owner = THIS_MODULE,
 819         .open = nonseekable_open,
 820         .unlocked_ioctl = chsc_ioctl,
 821         .compat_ioctl = chsc_ioctl,
 822         .llseek = no_llseek,
 823 };
 824
 825 static struct miscdevice chsc_misc_device = {
 826         .minor = MISC_DYNAMIC_MINOR,
 827         .name = "chsc",
 828         .fops = &chsc_fops,
 829 };
 830
 831 static int __init chsc_misc_init(void)
 832 {
 833         return misc_register(&chsc_misc_device);
 834 }
 835
 836 static void chsc_misc_cleanup(void)
 837 {
 838         misc_deregister(&chsc_misc_device);
 839 }
 840
 841 static int __init chsc_sch_init(void)
 842 {
 843         int ret;
 844
 845         ret = chsc_init_dbfs();
 846         if (ret)
 847                 return ret;
 848         isc_register(CHSC_SCH_ISC);
 849         ret = chsc_init_sch_driver();
 850         if (ret)
 851                 goto out_dbf;
 852         ret = chsc_misc_init();
 853         if (ret)
 854                 goto out_driver;
 855         return ret;
 856 out_driver:
 857         chsc_cleanup_sch_driver();
 858 out_dbf:
 859         isc_unregister(CHSC_SCH_ISC);
 860         chsc_remove_dbfs();
 861         return ret;
 862 }
 863
 864 static void __exit chsc_sch_exit(void)
 865 {
 866         chsc_misc_cleanup();
 867         chsc_cleanup_sch_driver();
 868         isc_unregister(CHSC_SCH_ISC);
 869         chsc_remove_dbfs();
 870 }
 871
 872 module_init(chsc_sch_init);
 873 module_exit(chsc_sch_exit);