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/compat.h> 20 #include <asm/cio.h> 21 #include <asm/chsc.h> 22 #include <asm/isc.h> 23 24 #include "cio.h" 25 #include "cio_debug.h" 26 #include "css.h" 27 #include "chsc_sch.h" 28 #include "ioasm.h" 29 30 static debug_info_t *chsc_debug_msg_id; 31 static debug_info_t *chsc_debug_log_id; 32 33 static struct chsc_request *on_close_request; 34 static struct chsc_async_area *on_close_chsc_area; 35 static DEFINE_MUTEX(on_close_mutex); 36 37 #define CHSC_MSG(imp, args...) do { \ 38 debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \ 39 } while (0) 40 41 #define CHSC_LOG(imp, txt) do { \ 42 debug_text_event(chsc_debug_log_id, imp , txt); \ 43 } while (0) 44 45 static void CHSC_LOG_HEX(int level, void *data, int length) 46 { 47 debug_event(chsc_debug_log_id, level, data, length); 48 } 49 50 MODULE_AUTHOR("IBM Corporation"); 51 MODULE_DESCRIPTION("driver for s390 chsc subchannels"); 52 MODULE_LICENSE("GPL"); 53 54 static void chsc_subchannel_irq(struct subchannel *sch) 55 { 56 struct chsc_private *private = dev_get_drvdata(&sch->dev); 57 struct chsc_request *request = private->request; 58 struct irb *irb = this_cpu_ptr(&cio_irb); 59 60 CHSC_LOG(4, "irb"); 61 CHSC_LOG_HEX(4, irb, sizeof(*irb)); 62 inc_irq_stat(IRQIO_CSC); 63 64 /* Copy irb to provided request and set done. */ 65 if (!request) { 66 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n", 67 sch->schid.ssid, sch->schid.sch_no); 68 return; 69 } 70 private->request = NULL; 71 memcpy(&request->irb, irb, sizeof(*irb)); 72 cio_update_schib(sch); 73 complete(&request->completion); 74 put_device(&sch->dev); 75 } 76 77 static int chsc_subchannel_probe(struct subchannel *sch) 78 { 79 struct chsc_private *private; 80 int ret; 81 82 CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n", 83 sch->schid.ssid, sch->schid.sch_no); 84 sch->isc = CHSC_SCH_ISC; 85 private = kzalloc(sizeof(*private), GFP_KERNEL); 86 if (!private) 87 return -ENOMEM; 88 dev_set_drvdata(&sch->dev, private); 89 ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch); 90 if (ret) { 91 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n", 92 sch->schid.ssid, sch->schid.sch_no, ret); 93 dev_set_drvdata(&sch->dev, NULL); 94 kfree(private); 95 } else { 96 if (dev_get_uevent_suppress(&sch->dev)) { 97 dev_set_uevent_suppress(&sch->dev, 0); 98 kobject_uevent(&sch->dev.kobj, KOBJ_ADD); 99 } 100 } 101 return ret; 102 } 103 104 static int chsc_subchannel_remove(struct subchannel *sch) 105 { 106 struct chsc_private *private; 107 108 cio_disable_subchannel(sch); 109 private = dev_get_drvdata(&sch->dev); 110 dev_set_drvdata(&sch->dev, NULL); 111 if (private->request) { 112 complete(&private->request->completion); 113 put_device(&sch->dev); 114 } 115 kfree(private); 116 return 0; 117 } 118 119 static void chsc_subchannel_shutdown(struct subchannel *sch) 120 { 121 cio_disable_subchannel(sch); 122 } 123 124 static int chsc_subchannel_prepare(struct subchannel *sch) 125 { 126 int cc; 127 struct schib schib; 128 /* 129 * Don't allow suspend while the subchannel is not idle 130 * since we don't have a way to clear the subchannel and 131 * cannot disable it with a request running. 132 */ 133 cc = stsch(sch->schid, &schib); 134 if (!cc && scsw_stctl(&schib.scsw)) 135 return -EAGAIN; 136 return 0; 137 } 138 139 static int chsc_subchannel_freeze(struct subchannel *sch) 140 { 141 return cio_disable_subchannel(sch); 142 } 143 144 static int chsc_subchannel_restore(struct subchannel *sch) 145 { 146 return cio_enable_subchannel(sch, (u32)(unsigned long)sch); 147 } 148 149 static struct css_device_id chsc_subchannel_ids[] = { 150 { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, }, 151 { /* end of list */ }, 152 }; 153 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids); 154 155 static struct css_driver chsc_subchannel_driver = { 156 .drv = { 157 .owner = THIS_MODULE, 158 .name = "chsc_subchannel", 159 }, 160 .subchannel_type = chsc_subchannel_ids, 161 .irq = chsc_subchannel_irq, 162 .probe = chsc_subchannel_probe, 163 .remove = chsc_subchannel_remove, 164 .shutdown = chsc_subchannel_shutdown, 165 .prepare = chsc_subchannel_prepare, 166 .freeze = chsc_subchannel_freeze, 167 .thaw = chsc_subchannel_restore, 168 .restore = chsc_subchannel_restore, 169 }; 170 171 static int __init chsc_init_dbfs(void) 172 { 173 chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * 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 debug_unregister(chsc_debug_msg_id); 186 return -ENOMEM; 187 } 188 189 static void chsc_remove_dbfs(void) 190 { 191 debug_unregister(chsc_debug_log_id); 192 debug_unregister(chsc_debug_msg_id); 193 } 194 195 static int __init chsc_init_sch_driver(void) 196 { 197 return css_driver_register(&chsc_subchannel_driver); 198 } 199 200 static void chsc_cleanup_sch_driver(void) 201 { 202 css_driver_unregister(&chsc_subchannel_driver); 203 } 204 205 static DEFINE_SPINLOCK(chsc_lock); 206 207 static int chsc_subchannel_match_next_free(struct device *dev, void *data) 208 { 209 struct subchannel *sch = to_subchannel(dev); 210 211 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw); 212 } 213 214 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch) 215 { 216 struct device *dev; 217 218 dev = driver_find_device(&chsc_subchannel_driver.drv, 219 sch ? &sch->dev : NULL, NULL, 220 chsc_subchannel_match_next_free); 221 return dev ? to_subchannel(dev) : NULL; 222 } 223 224 /** 225 * chsc_async() - try to start a chsc request asynchronously 226 * @chsc_area: request to be started 227 * @request: request structure to associate 228 * 229 * Tries to start a chsc request on one of the existing chsc subchannels. 230 * Returns: 231 * %0 if the request was performed synchronously 232 * %-EINPROGRESS if the request was successfully started 233 * %-EBUSY if all chsc subchannels are busy 234 * %-ENODEV if no chsc subchannels are available 235 * Context: 236 * interrupts disabled, chsc_lock held 237 */ 238 static int chsc_async(struct chsc_async_area *chsc_area, 239 struct chsc_request *request) 240 { 241 int cc; 242 struct chsc_private *private; 243 struct subchannel *sch = NULL; 244 int ret = -ENODEV; 245 char dbf[10]; 246 247 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4; 248 while ((sch = chsc_get_next_subchannel(sch))) { 249 spin_lock(sch->lock); 250 private = dev_get_drvdata(&sch->dev); 251 if (private->request) { 252 spin_unlock(sch->lock); 253 ret = -EBUSY; 254 continue; 255 } 256 chsc_area->header.sid = sch->schid; 257 CHSC_LOG(2, "schid"); 258 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid)); 259 cc = chsc(chsc_area); 260 snprintf(dbf, sizeof(dbf), "cc:%d", cc); 261 CHSC_LOG(2, dbf); 262 switch (cc) { 263 case 0: 264 ret = 0; 265 break; 266 case 1: 267 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC; 268 ret = -EINPROGRESS; 269 private->request = request; 270 break; 271 case 2: 272 ret = -EBUSY; 273 break; 274 default: 275 ret = -ENODEV; 276 } 277 spin_unlock(sch->lock); 278 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n", 279 sch->schid.ssid, sch->schid.sch_no, cc); 280 if (ret == -EINPROGRESS) 281 return -EINPROGRESS; 282 put_device(&sch->dev); 283 if (ret == 0) 284 return 0; 285 } 286 return ret; 287 } 288 289 static void chsc_log_command(void *chsc_area) 290 { 291 char dbf[10]; 292 293 snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]); 294 CHSC_LOG(0, dbf); 295 CHSC_LOG_HEX(0, chsc_area, 32); 296 } 297 298 static int chsc_examine_irb(struct chsc_request *request) 299 { 300 int backed_up; 301 302 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND)) 303 return -EIO; 304 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK; 305 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK; 306 if (scsw_cstat(&request->irb.scsw) == 0) 307 return 0; 308 if (!backed_up) 309 return 0; 310 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK) 311 return -EIO; 312 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK) 313 return -EPERM; 314 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK) 315 return -EAGAIN; 316 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK) 317 return -EAGAIN; 318 return -EIO; 319 } 320 321 static int chsc_ioctl_start(void __user *user_area) 322 { 323 struct chsc_request *request; 324 struct chsc_async_area *chsc_area; 325 int ret; 326 char dbf[10]; 327 328 if (!css_general_characteristics.dynio) 329 /* It makes no sense to try. */ 330 return -EOPNOTSUPP; 331 chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL); 332 if (!chsc_area) 333 return -ENOMEM; 334 request = kzalloc(sizeof(*request), GFP_KERNEL); 335 if (!request) { 336 ret = -ENOMEM; 337 goto out_free; 338 } 339 init_completion(&request->completion); 340 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) { 341 ret = -EFAULT; 342 goto out_free; 343 } 344 chsc_log_command(chsc_area); 345 spin_lock_irq(&chsc_lock); 346 ret = chsc_async(chsc_area, request); 347 spin_unlock_irq(&chsc_lock); 348 if (ret == -EINPROGRESS) { 349 wait_for_completion(&request->completion); 350 ret = chsc_examine_irb(request); 351 } 352 /* copy area back to user */ 353 if (!ret) 354 if (copy_to_user(user_area, chsc_area, PAGE_SIZE)) 355 ret = -EFAULT; 356 out_free: 357 snprintf(dbf, sizeof(dbf), "ret:%d", ret); 358 CHSC_LOG(0, dbf); 359 kfree(request); 360 free_page((unsigned long)chsc_area); 361 return ret; 362 } 363 364 static int chsc_ioctl_on_close_set(void __user *user_area) 365 { 366 char dbf[13]; 367 int ret; 368 369 mutex_lock(&on_close_mutex); 370 if (on_close_chsc_area) { 371 ret = -EBUSY; 372 goto out_unlock; 373 } 374 on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL); 375 if (!on_close_request) { 376 ret = -ENOMEM; 377 goto out_unlock; 378 } 379 on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL); 380 if (!on_close_chsc_area) { 381 ret = -ENOMEM; 382 goto out_free_request; 383 } 384 if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) { 385 ret = -EFAULT; 386 goto out_free_chsc; 387 } 388 ret = 0; 389 goto out_unlock; 390 391 out_free_chsc: 392 free_page((unsigned long)on_close_chsc_area); 393 on_close_chsc_area = NULL; 394 out_free_request: 395 kfree(on_close_request); 396 on_close_request = NULL; 397 out_unlock: 398 mutex_unlock(&on_close_mutex); 399 snprintf(dbf, sizeof(dbf), "ocsret:%d", ret); 400 CHSC_LOG(0, dbf); 401 return ret; 402 } 403 404 static int chsc_ioctl_on_close_remove(void) 405 { 406 char dbf[13]; 407 int ret; 408 409 mutex_lock(&on_close_mutex); 410 if (!on_close_chsc_area) { 411 ret = -ENOENT; 412 goto out_unlock; 413 } 414 free_page((unsigned long)on_close_chsc_area); 415 on_close_chsc_area = NULL; 416 kfree(on_close_request); 417 on_close_request = NULL; 418 ret = 0; 419 out_unlock: 420 mutex_unlock(&on_close_mutex); 421 snprintf(dbf, sizeof(dbf), "ocrret:%d", ret); 422 CHSC_LOG(0, dbf); 423 return ret; 424 } 425 426 static int chsc_ioctl_start_sync(void __user *user_area) 427 { 428 struct chsc_sync_area *chsc_area; 429 int ret, ccode; 430 431 chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 432 if (!chsc_area) 433 return -ENOMEM; 434 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) { 435 ret = -EFAULT; 436 goto out_free; 437 } 438 if (chsc_area->header.code & 0x4000) { 439 ret = -EINVAL; 440 goto out_free; 441 } 442 chsc_log_command(chsc_area); 443 ccode = chsc(chsc_area); 444 if (ccode != 0) { 445 ret = -EIO; 446 goto out_free; 447 } 448 if (copy_to_user(user_area, chsc_area, PAGE_SIZE)) 449 ret = -EFAULT; 450 else 451 ret = 0; 452 out_free: 453 free_page((unsigned long)chsc_area); 454 return ret; 455 } 456 457 static int chsc_ioctl_info_channel_path(void __user *user_cd) 458 { 459 struct chsc_chp_cd *cd; 460 int ret, ccode; 461 struct { 462 struct chsc_header request; 463 u32 : 2; 464 u32 m : 1; 465 u32 : 1; 466 u32 fmt1 : 4; 467 u32 cssid : 8; 468 u32 : 8; 469 u32 first_chpid : 8; 470 u32 : 24; 471 u32 last_chpid : 8; 472 u32 : 32; 473 struct chsc_header response; 474 u8 data[PAGE_SIZE - 20]; 475 } __attribute__ ((packed)) *scpcd_area; 476 477 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 478 if (!scpcd_area) 479 return -ENOMEM; 480 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 481 if (!cd) { 482 ret = -ENOMEM; 483 goto out_free; 484 } 485 if (copy_from_user(cd, user_cd, sizeof(*cd))) { 486 ret = -EFAULT; 487 goto out_free; 488 } 489 scpcd_area->request.length = 0x0010; 490 scpcd_area->request.code = 0x0028; 491 scpcd_area->m = cd->m; 492 scpcd_area->fmt1 = cd->fmt; 493 scpcd_area->cssid = cd->chpid.cssid; 494 scpcd_area->first_chpid = cd->chpid.id; 495 scpcd_area->last_chpid = cd->chpid.id; 496 497 ccode = chsc(scpcd_area); 498 if (ccode != 0) { 499 ret = -EIO; 500 goto out_free; 501 } 502 if (scpcd_area->response.code != 0x0001) { 503 ret = -EIO; 504 CHSC_MSG(0, "scpcd: response code=%x\n", 505 scpcd_area->response.code); 506 goto out_free; 507 } 508 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length); 509 if (copy_to_user(user_cd, cd, sizeof(*cd))) 510 ret = -EFAULT; 511 else 512 ret = 0; 513 out_free: 514 kfree(cd); 515 free_page((unsigned long)scpcd_area); 516 return ret; 517 } 518 519 static int chsc_ioctl_info_cu(void __user *user_cd) 520 { 521 struct chsc_cu_cd *cd; 522 int ret, ccode; 523 struct { 524 struct chsc_header request; 525 u32 : 2; 526 u32 m : 1; 527 u32 : 1; 528 u32 fmt1 : 4; 529 u32 cssid : 8; 530 u32 : 8; 531 u32 first_cun : 8; 532 u32 : 24; 533 u32 last_cun : 8; 534 u32 : 32; 535 struct chsc_header response; 536 u8 data[PAGE_SIZE - 20]; 537 } __attribute__ ((packed)) *scucd_area; 538 539 scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 540 if (!scucd_area) 541 return -ENOMEM; 542 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 543 if (!cd) { 544 ret = -ENOMEM; 545 goto out_free; 546 } 547 if (copy_from_user(cd, user_cd, sizeof(*cd))) { 548 ret = -EFAULT; 549 goto out_free; 550 } 551 scucd_area->request.length = 0x0010; 552 scucd_area->request.code = 0x0026; 553 scucd_area->m = cd->m; 554 scucd_area->fmt1 = cd->fmt; 555 scucd_area->cssid = cd->cssid; 556 scucd_area->first_cun = cd->cun; 557 scucd_area->last_cun = cd->cun; 558 559 ccode = chsc(scucd_area); 560 if (ccode != 0) { 561 ret = -EIO; 562 goto out_free; 563 } 564 if (scucd_area->response.code != 0x0001) { 565 ret = -EIO; 566 CHSC_MSG(0, "scucd: response code=%x\n", 567 scucd_area->response.code); 568 goto out_free; 569 } 570 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length); 571 if (copy_to_user(user_cd, cd, sizeof(*cd))) 572 ret = -EFAULT; 573 else 574 ret = 0; 575 out_free: 576 kfree(cd); 577 free_page((unsigned long)scucd_area); 578 return ret; 579 } 580 581 static int chsc_ioctl_info_sch_cu(void __user *user_cud) 582 { 583 struct chsc_sch_cud *cud; 584 int ret, ccode; 585 struct { 586 struct chsc_header request; 587 u32 : 2; 588 u32 m : 1; 589 u32 : 5; 590 u32 fmt1 : 4; 591 u32 : 2; 592 u32 ssid : 2; 593 u32 first_sch : 16; 594 u32 : 8; 595 u32 cssid : 8; 596 u32 last_sch : 16; 597 u32 : 32; 598 struct chsc_header response; 599 u8 data[PAGE_SIZE - 20]; 600 } __attribute__ ((packed)) *sscud_area; 601 602 sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 603 if (!sscud_area) 604 return -ENOMEM; 605 cud = kzalloc(sizeof(*cud), GFP_KERNEL); 606 if (!cud) { 607 ret = -ENOMEM; 608 goto out_free; 609 } 610 if (copy_from_user(cud, user_cud, sizeof(*cud))) { 611 ret = -EFAULT; 612 goto out_free; 613 } 614 sscud_area->request.length = 0x0010; 615 sscud_area->request.code = 0x0006; 616 sscud_area->m = cud->schid.m; 617 sscud_area->fmt1 = cud->fmt; 618 sscud_area->ssid = cud->schid.ssid; 619 sscud_area->first_sch = cud->schid.sch_no; 620 sscud_area->cssid = cud->schid.cssid; 621 sscud_area->last_sch = cud->schid.sch_no; 622 623 ccode = chsc(sscud_area); 624 if (ccode != 0) { 625 ret = -EIO; 626 goto out_free; 627 } 628 if (sscud_area->response.code != 0x0001) { 629 ret = -EIO; 630 CHSC_MSG(0, "sscud: response code=%x\n", 631 sscud_area->response.code); 632 goto out_free; 633 } 634 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length); 635 if (copy_to_user(user_cud, cud, sizeof(*cud))) 636 ret = -EFAULT; 637 else 638 ret = 0; 639 out_free: 640 kfree(cud); 641 free_page((unsigned long)sscud_area); 642 return ret; 643 } 644 645 static int chsc_ioctl_conf_info(void __user *user_ci) 646 { 647 struct chsc_conf_info *ci; 648 int ret, ccode; 649 struct { 650 struct chsc_header request; 651 u32 : 2; 652 u32 m : 1; 653 u32 : 1; 654 u32 fmt1 : 4; 655 u32 cssid : 8; 656 u32 : 6; 657 u32 ssid : 2; 658 u32 : 8; 659 u64 : 64; 660 struct chsc_header response; 661 u8 data[PAGE_SIZE - 20]; 662 } __attribute__ ((packed)) *sci_area; 663 664 sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 665 if (!sci_area) 666 return -ENOMEM; 667 ci = kzalloc(sizeof(*ci), GFP_KERNEL); 668 if (!ci) { 669 ret = -ENOMEM; 670 goto out_free; 671 } 672 if (copy_from_user(ci, user_ci, sizeof(*ci))) { 673 ret = -EFAULT; 674 goto out_free; 675 } 676 sci_area->request.length = 0x0010; 677 sci_area->request.code = 0x0012; 678 sci_area->m = ci->id.m; 679 sci_area->fmt1 = ci->fmt; 680 sci_area->cssid = ci->id.cssid; 681 sci_area->ssid = ci->id.ssid; 682 683 ccode = chsc(sci_area); 684 if (ccode != 0) { 685 ret = -EIO; 686 goto out_free; 687 } 688 if (sci_area->response.code != 0x0001) { 689 ret = -EIO; 690 CHSC_MSG(0, "sci: response code=%x\n", 691 sci_area->response.code); 692 goto out_free; 693 } 694 memcpy(&ci->scid, &sci_area->response, sci_area->response.length); 695 if (copy_to_user(user_ci, ci, sizeof(*ci))) 696 ret = -EFAULT; 697 else 698 ret = 0; 699 out_free: 700 kfree(ci); 701 free_page((unsigned long)sci_area); 702 return ret; 703 } 704 705 static int chsc_ioctl_conf_comp_list(void __user *user_ccl) 706 { 707 struct chsc_comp_list *ccl; 708 int ret, ccode; 709 struct { 710 struct chsc_header request; 711 u32 ctype : 8; 712 u32 : 4; 713 u32 fmt : 4; 714 u32 : 16; 715 u64 : 64; 716 u32 list_parm[2]; 717 u64 : 64; 718 struct chsc_header response; 719 u8 data[PAGE_SIZE - 36]; 720 } __attribute__ ((packed)) *sccl_area; 721 struct { 722 u32 m : 1; 723 u32 : 31; 724 u32 cssid : 8; 725 u32 : 16; 726 u32 chpid : 8; 727 } __attribute__ ((packed)) *chpid_parm; 728 struct { 729 u32 f_cssid : 8; 730 u32 l_cssid : 8; 731 u32 : 16; 732 u32 res; 733 } __attribute__ ((packed)) *cssids_parm; 734 735 sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 736 if (!sccl_area) 737 return -ENOMEM; 738 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL); 739 if (!ccl) { 740 ret = -ENOMEM; 741 goto out_free; 742 } 743 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) { 744 ret = -EFAULT; 745 goto out_free; 746 } 747 sccl_area->request.length = 0x0020; 748 sccl_area->request.code = 0x0030; 749 sccl_area->fmt = ccl->req.fmt; 750 sccl_area->ctype = ccl->req.ctype; 751 switch (sccl_area->ctype) { 752 case CCL_CU_ON_CHP: 753 case CCL_IOP_CHP: 754 chpid_parm = (void *)&sccl_area->list_parm; 755 chpid_parm->m = ccl->req.chpid.m; 756 chpid_parm->cssid = ccl->req.chpid.chp.cssid; 757 chpid_parm->chpid = ccl->req.chpid.chp.id; 758 break; 759 case CCL_CSS_IMG: 760 case CCL_CSS_IMG_CONF_CHAR: 761 cssids_parm = (void *)&sccl_area->list_parm; 762 cssids_parm->f_cssid = ccl->req.cssids.f_cssid; 763 cssids_parm->l_cssid = ccl->req.cssids.l_cssid; 764 break; 765 } 766 ccode = chsc(sccl_area); 767 if (ccode != 0) { 768 ret = -EIO; 769 goto out_free; 770 } 771 if (sccl_area->response.code != 0x0001) { 772 ret = -EIO; 773 CHSC_MSG(0, "sccl: response code=%x\n", 774 sccl_area->response.code); 775 goto out_free; 776 } 777 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length); 778 if (copy_to_user(user_ccl, ccl, sizeof(*ccl))) 779 ret = -EFAULT; 780 else 781 ret = 0; 782 out_free: 783 kfree(ccl); 784 free_page((unsigned long)sccl_area); 785 return ret; 786 } 787 788 static int chsc_ioctl_chpd(void __user *user_chpd) 789 { 790 struct chsc_scpd *scpd_area; 791 struct chsc_cpd_info *chpd; 792 int ret; 793 794 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL); 795 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 796 if (!scpd_area || !chpd) { 797 ret = -ENOMEM; 798 goto out_free; 799 } 800 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) { 801 ret = -EFAULT; 802 goto out_free; 803 } 804 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt, 805 chpd->rfmt, chpd->c, chpd->m, 806 scpd_area); 807 if (ret) 808 goto out_free; 809 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length); 810 if (copy_to_user(user_chpd, chpd, sizeof(*chpd))) 811 ret = -EFAULT; 812 out_free: 813 kfree(chpd); 814 free_page((unsigned long)scpd_area); 815 return ret; 816 } 817 818 static int chsc_ioctl_dcal(void __user *user_dcal) 819 { 820 struct chsc_dcal *dcal; 821 int ret, ccode; 822 struct { 823 struct chsc_header request; 824 u32 atype : 8; 825 u32 : 4; 826 u32 fmt : 4; 827 u32 : 16; 828 u32 res0[2]; 829 u32 list_parm[2]; 830 u32 res1[2]; 831 struct chsc_header response; 832 u8 data[PAGE_SIZE - 36]; 833 } __attribute__ ((packed)) *sdcal_area; 834 835 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 836 if (!sdcal_area) 837 return -ENOMEM; 838 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL); 839 if (!dcal) { 840 ret = -ENOMEM; 841 goto out_free; 842 } 843 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) { 844 ret = -EFAULT; 845 goto out_free; 846 } 847 sdcal_area->request.length = 0x0020; 848 sdcal_area->request.code = 0x0034; 849 sdcal_area->atype = dcal->req.atype; 850 sdcal_area->fmt = dcal->req.fmt; 851 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm, 852 sizeof(sdcal_area->list_parm)); 853 854 ccode = chsc(sdcal_area); 855 if (ccode != 0) { 856 ret = -EIO; 857 goto out_free; 858 } 859 if (sdcal_area->response.code != 0x0001) { 860 ret = -EIO; 861 CHSC_MSG(0, "sdcal: response code=%x\n", 862 sdcal_area->response.code); 863 goto out_free; 864 } 865 memcpy(&dcal->sdcal, &sdcal_area->response, 866 sdcal_area->response.length); 867 if (copy_to_user(user_dcal, dcal, sizeof(*dcal))) 868 ret = -EFAULT; 869 else 870 ret = 0; 871 out_free: 872 kfree(dcal); 873 free_page((unsigned long)sdcal_area); 874 return ret; 875 } 876 877 static long chsc_ioctl(struct file *filp, unsigned int cmd, 878 unsigned long arg) 879 { 880 void __user *argp; 881 882 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd); 883 if (is_compat_task()) 884 argp = compat_ptr(arg); 885 else 886 argp = (void __user *)arg; 887 switch (cmd) { 888 case CHSC_START: 889 return chsc_ioctl_start(argp); 890 case CHSC_START_SYNC: 891 return chsc_ioctl_start_sync(argp); 892 case CHSC_INFO_CHANNEL_PATH: 893 return chsc_ioctl_info_channel_path(argp); 894 case CHSC_INFO_CU: 895 return chsc_ioctl_info_cu(argp); 896 case CHSC_INFO_SCH_CU: 897 return chsc_ioctl_info_sch_cu(argp); 898 case CHSC_INFO_CI: 899 return chsc_ioctl_conf_info(argp); 900 case CHSC_INFO_CCL: 901 return chsc_ioctl_conf_comp_list(argp); 902 case CHSC_INFO_CPD: 903 return chsc_ioctl_chpd(argp); 904 case CHSC_INFO_DCAL: 905 return chsc_ioctl_dcal(argp); 906 case CHSC_ON_CLOSE_SET: 907 return chsc_ioctl_on_close_set(argp); 908 case CHSC_ON_CLOSE_REMOVE: 909 return chsc_ioctl_on_close_remove(); 910 default: /* unknown ioctl number */ 911 return -ENOIOCTLCMD; 912 } 913 } 914 915 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1); 916 917 static int chsc_open(struct inode *inode, struct file *file) 918 { 919 if (!atomic_dec_and_test(&chsc_ready_for_use)) { 920 atomic_inc(&chsc_ready_for_use); 921 return -EBUSY; 922 } 923 return nonseekable_open(inode, file); 924 } 925 926 static int chsc_release(struct inode *inode, struct file *filp) 927 { 928 char dbf[13]; 929 int ret; 930 931 mutex_lock(&on_close_mutex); 932 if (!on_close_chsc_area) 933 goto out_unlock; 934 init_completion(&on_close_request->completion); 935 CHSC_LOG(0, "on_close"); 936 chsc_log_command(on_close_chsc_area); 937 spin_lock_irq(&chsc_lock); 938 ret = chsc_async(on_close_chsc_area, on_close_request); 939 spin_unlock_irq(&chsc_lock); 940 if (ret == -EINPROGRESS) { 941 wait_for_completion(&on_close_request->completion); 942 ret = chsc_examine_irb(on_close_request); 943 } 944 snprintf(dbf, sizeof(dbf), "relret:%d", ret); 945 CHSC_LOG(0, dbf); 946 free_page((unsigned long)on_close_chsc_area); 947 on_close_chsc_area = NULL; 948 kfree(on_close_request); 949 on_close_request = NULL; 950 out_unlock: 951 mutex_unlock(&on_close_mutex); 952 atomic_inc(&chsc_ready_for_use); 953 return 0; 954 } 955 956 static const struct file_operations chsc_fops = { 957 .owner = THIS_MODULE, 958 .open = chsc_open, 959 .release = chsc_release, 960 .unlocked_ioctl = chsc_ioctl, 961 .compat_ioctl = chsc_ioctl, 962 .llseek = no_llseek, 963 }; 964 965 static struct miscdevice chsc_misc_device = { 966 .minor = MISC_DYNAMIC_MINOR, 967 .name = "chsc", 968 .fops = &chsc_fops, 969 }; 970 971 static int __init chsc_misc_init(void) 972 { 973 return misc_register(&chsc_misc_device); 974 } 975 976 static void chsc_misc_cleanup(void) 977 { 978 misc_deregister(&chsc_misc_device); 979 } 980 981 static int __init chsc_sch_init(void) 982 { 983 int ret; 984 985 ret = chsc_init_dbfs(); 986 if (ret) 987 return ret; 988 isc_register(CHSC_SCH_ISC); 989 ret = chsc_init_sch_driver(); 990 if (ret) 991 goto out_dbf; 992 ret = chsc_misc_init(); 993 if (ret) 994 goto out_driver; 995 return ret; 996 out_driver: 997 chsc_cleanup_sch_driver(); 998 out_dbf: 999 isc_unregister(CHSC_SCH_ISC); 1000 chsc_remove_dbfs(); 1001 return ret; 1002 } 1003 1004 static void __exit chsc_sch_exit(void) 1005 { 1006 chsc_misc_cleanup(); 1007 chsc_cleanup_sch_driver(); 1008 isc_unregister(CHSC_SCH_ISC); 1009 chsc_remove_dbfs(); 1010 } 1011 1012 module_init(chsc_sch_init); 1013 module_exit(chsc_sch_exit); 1014