1 /* 2 * Author(s)......: Carsten Otte <cotte@de.ibm.com> 3 * Rob M van der Heij <rvdheij@nl.ibm.com> 4 * Steven Shultz <shultzss@us.ibm.com> 5 * Bugreports.to..: <Linux390@de.ibm.com> 6 * Copyright IBM Corp. 2002, 2004 7 */ 8 9 #define KMSG_COMPONENT "extmem" 10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12 #include <linux/kernel.h> 13 #include <linux/string.h> 14 #include <linux/spinlock.h> 15 #include <linux/list.h> 16 #include <linux/slab.h> 17 #include <linux/module.h> 18 #include <linux/bootmem.h> 19 #include <linux/ctype.h> 20 #include <linux/ioport.h> 21 #include <asm/page.h> 22 #include <asm/pgtable.h> 23 #include <asm/ebcdic.h> 24 #include <asm/errno.h> 25 #include <asm/extmem.h> 26 #include <asm/cpcmd.h> 27 #include <asm/setup.h> 28 29 #define DCSS_LOADSHR 0x00 30 #define DCSS_LOADNSR 0x04 31 #define DCSS_PURGESEG 0x08 32 #define DCSS_FINDSEG 0x0c 33 #define DCSS_LOADNOLY 0x10 34 #define DCSS_SEGEXT 0x18 35 #define DCSS_LOADSHRX 0x20 36 #define DCSS_LOADNSRX 0x24 37 #define DCSS_FINDSEGX 0x2c 38 #define DCSS_SEGEXTX 0x38 39 #define DCSS_FINDSEGA 0x0c 40 41 struct qrange { 42 unsigned long start; /* last byte type */ 43 unsigned long end; /* last byte reserved */ 44 }; 45 46 struct qout64 { 47 unsigned long segstart; 48 unsigned long segend; 49 int segcnt; 50 int segrcnt; 51 struct qrange range[6]; 52 }; 53 54 #ifdef CONFIG_64BIT 55 struct qrange_old { 56 unsigned int start; /* last byte type */ 57 unsigned int end; /* last byte reserved */ 58 }; 59 60 /* output area format for the Diag x'64' old subcode x'18' */ 61 struct qout64_old { 62 int segstart; 63 int segend; 64 int segcnt; 65 int segrcnt; 66 struct qrange_old range[6]; 67 }; 68 #endif 69 70 struct qin64 { 71 char qopcode; 72 char rsrv1[3]; 73 char qrcode; 74 char rsrv2[3]; 75 char qname[8]; 76 unsigned int qoutptr; 77 short int qoutlen; 78 }; 79 80 struct dcss_segment { 81 struct list_head list; 82 char dcss_name[8]; 83 char res_name[15]; 84 unsigned long start_addr; 85 unsigned long end; 86 atomic_t ref_count; 87 int do_nonshared; 88 unsigned int vm_segtype; 89 struct qrange range[6]; 90 int segcnt; 91 struct resource *res; 92 }; 93 94 static DEFINE_MUTEX(dcss_lock); 95 static LIST_HEAD(dcss_list); 96 static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC", 97 "EW/EN-MIXED" }; 98 static int loadshr_scode, loadnsr_scode, findseg_scode; 99 static int segext_scode, purgeseg_scode; 100 static int scode_set; 101 102 /* set correct Diag x'64' subcodes. */ 103 static int 104 dcss_set_subcodes(void) 105 { 106 #ifdef CONFIG_64BIT 107 char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA); 108 unsigned long rx, ry; 109 int rc; 110 111 if (name == NULL) 112 return -ENOMEM; 113 114 rx = (unsigned long) name; 115 ry = DCSS_FINDSEGX; 116 117 strcpy(name, "dummy"); 118 asm volatile( 119 " diag %0,%1,0x64\n" 120 "0: ipm %2\n" 121 " srl %2,28\n" 122 " j 2f\n" 123 "1: la %2,3\n" 124 "2:\n" 125 EX_TABLE(0b, 1b) 126 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); 127 128 kfree(name); 129 /* Diag x'64' new subcodes are supported, set to new subcodes */ 130 if (rc != 3) { 131 loadshr_scode = DCSS_LOADSHRX; 132 loadnsr_scode = DCSS_LOADNSRX; 133 purgeseg_scode = DCSS_PURGESEG; 134 findseg_scode = DCSS_FINDSEGX; 135 segext_scode = DCSS_SEGEXTX; 136 return 0; 137 } 138 #endif 139 /* Diag x'64' new subcodes are not supported, set to old subcodes */ 140 loadshr_scode = DCSS_LOADNOLY; 141 loadnsr_scode = DCSS_LOADNSR; 142 purgeseg_scode = DCSS_PURGESEG; 143 findseg_scode = DCSS_FINDSEG; 144 segext_scode = DCSS_SEGEXT; 145 return 0; 146 } 147 148 /* 149 * Create the 8 bytes, ebcdic VM segment name from 150 * an ascii name. 151 */ 152 static void 153 dcss_mkname(char *name, char *dcss_name) 154 { 155 int i; 156 157 for (i = 0; i < 8; i++) { 158 if (name[i] == '\0') 159 break; 160 dcss_name[i] = toupper(name[i]); 161 }; 162 for (; i < 8; i++) 163 dcss_name[i] = ' '; 164 ASCEBC(dcss_name, 8); 165 } 166 167 168 /* 169 * search all segments in dcss_list, and return the one 170 * namend *name. If not found, return NULL. 171 */ 172 static struct dcss_segment * 173 segment_by_name (char *name) 174 { 175 char dcss_name[9]; 176 struct list_head *l; 177 struct dcss_segment *tmp, *retval = NULL; 178 179 BUG_ON(!mutex_is_locked(&dcss_lock)); 180 dcss_mkname (name, dcss_name); 181 list_for_each (l, &dcss_list) { 182 tmp = list_entry (l, struct dcss_segment, list); 183 if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) { 184 retval = tmp; 185 break; 186 } 187 } 188 return retval; 189 } 190 191 192 /* 193 * Perform a function on a dcss segment. 194 */ 195 static inline int 196 dcss_diag(int *func, void *parameter, 197 unsigned long *ret1, unsigned long *ret2) 198 { 199 unsigned long rx, ry; 200 int rc; 201 202 if (scode_set == 0) { 203 rc = dcss_set_subcodes(); 204 if (rc < 0) 205 return rc; 206 scode_set = 1; 207 } 208 rx = (unsigned long) parameter; 209 ry = (unsigned long) *func; 210 211 #ifdef CONFIG_64BIT 212 /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */ 213 if (*func > DCSS_SEGEXT) 214 asm volatile( 215 " diag %0,%1,0x64\n" 216 " ipm %2\n" 217 " srl %2,28\n" 218 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); 219 /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */ 220 else 221 asm volatile( 222 " sam31\n" 223 " diag %0,%1,0x64\n" 224 " sam64\n" 225 " ipm %2\n" 226 " srl %2,28\n" 227 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); 228 #else 229 asm volatile( 230 " diag %0,%1,0x64\n" 231 " ipm %2\n" 232 " srl %2,28\n" 233 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); 234 #endif 235 *ret1 = rx; 236 *ret2 = ry; 237 return rc; 238 } 239 240 static inline int 241 dcss_diag_translate_rc (int vm_rc) { 242 if (vm_rc == 44) 243 return -ENOENT; 244 return -EIO; 245 } 246 247 248 /* do a diag to get info about a segment. 249 * fills start_address, end and vm_segtype fields 250 */ 251 static int 252 query_segment_type (struct dcss_segment *seg) 253 { 254 unsigned long dummy, vmrc; 255 int diag_cc, rc, i; 256 struct qout64 *qout; 257 struct qin64 *qin; 258 259 qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA); 260 qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA); 261 if ((qin == NULL) || (qout == NULL)) { 262 rc = -ENOMEM; 263 goto out_free; 264 } 265 266 /* initialize diag input parameters */ 267 qin->qopcode = DCSS_FINDSEGA; 268 qin->qoutptr = (unsigned long) qout; 269 qin->qoutlen = sizeof(struct qout64); 270 memcpy (qin->qname, seg->dcss_name, 8); 271 272 diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc); 273 274 if (diag_cc < 0) { 275 rc = diag_cc; 276 goto out_free; 277 } 278 if (diag_cc > 1) { 279 pr_warning("Querying a DCSS type failed with rc=%ld\n", vmrc); 280 rc = dcss_diag_translate_rc (vmrc); 281 goto out_free; 282 } 283 284 #ifdef CONFIG_64BIT 285 /* Only old format of output area of Diagnose x'64' is supported, 286 copy data for the new format. */ 287 if (segext_scode == DCSS_SEGEXT) { 288 struct qout64_old *qout_old; 289 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA); 290 if (qout_old == NULL) { 291 rc = -ENOMEM; 292 goto out_free; 293 } 294 memcpy(qout_old, qout, sizeof(struct qout64_old)); 295 qout->segstart = (unsigned long) qout_old->segstart; 296 qout->segend = (unsigned long) qout_old->segend; 297 qout->segcnt = qout_old->segcnt; 298 qout->segrcnt = qout_old->segrcnt; 299 300 if (qout->segcnt > 6) 301 qout->segrcnt = 6; 302 for (i = 0; i < qout->segrcnt; i++) { 303 qout->range[i].start = 304 (unsigned long) qout_old->range[i].start; 305 qout->range[i].end = 306 (unsigned long) qout_old->range[i].end; 307 } 308 kfree(qout_old); 309 } 310 #endif 311 if (qout->segcnt > 6) { 312 rc = -EOPNOTSUPP; 313 goto out_free; 314 } 315 316 if (qout->segcnt == 1) { 317 seg->vm_segtype = qout->range[0].start & 0xff; 318 } else { 319 /* multi-part segment. only one type supported here: 320 - all parts are contiguous 321 - all parts are either EW or EN type 322 - maximum 6 parts allowed */ 323 unsigned long start = qout->segstart >> PAGE_SHIFT; 324 for (i=0; i<qout->segcnt; i++) { 325 if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) && 326 ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) { 327 rc = -EOPNOTSUPP; 328 goto out_free; 329 } 330 if (start != qout->range[i].start >> PAGE_SHIFT) { 331 rc = -EOPNOTSUPP; 332 goto out_free; 333 } 334 start = (qout->range[i].end >> PAGE_SHIFT) + 1; 335 } 336 seg->vm_segtype = SEG_TYPE_EWEN; 337 } 338 339 /* analyze diag output and update seg */ 340 seg->start_addr = qout->segstart; 341 seg->end = qout->segend; 342 343 memcpy (seg->range, qout->range, 6*sizeof(struct qrange)); 344 seg->segcnt = qout->segcnt; 345 346 rc = 0; 347 348 out_free: 349 kfree(qin); 350 kfree(qout); 351 return rc; 352 } 353 354 /* 355 * get info about a segment 356 * possible return values: 357 * -ENOSYS : we are not running on VM 358 * -EIO : could not perform query diagnose 359 * -ENOENT : no such segment 360 * -EOPNOTSUPP: multi-part segment cannot be used with linux 361 * -ENOMEM : out of memory 362 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h 363 */ 364 int 365 segment_type (char* name) 366 { 367 int rc; 368 struct dcss_segment seg; 369 370 if (!MACHINE_IS_VM) 371 return -ENOSYS; 372 373 dcss_mkname(name, seg.dcss_name); 374 rc = query_segment_type (&seg); 375 if (rc < 0) 376 return rc; 377 return seg.vm_segtype; 378 } 379 380 /* 381 * check if segment collides with other segments that are currently loaded 382 * returns 1 if this is the case, 0 if no collision was found 383 */ 384 static int 385 segment_overlaps_others (struct dcss_segment *seg) 386 { 387 struct list_head *l; 388 struct dcss_segment *tmp; 389 390 BUG_ON(!mutex_is_locked(&dcss_lock)); 391 list_for_each(l, &dcss_list) { 392 tmp = list_entry(l, struct dcss_segment, list); 393 if ((tmp->start_addr >> 20) > (seg->end >> 20)) 394 continue; 395 if ((tmp->end >> 20) < (seg->start_addr >> 20)) 396 continue; 397 if (seg == tmp) 398 continue; 399 return 1; 400 } 401 return 0; 402 } 403 404 /* 405 * real segment loading function, called from segment_load 406 */ 407 static int 408 __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end) 409 { 410 unsigned long start_addr, end_addr, dummy; 411 struct dcss_segment *seg; 412 int rc, diag_cc; 413 414 start_addr = end_addr = 0; 415 seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA); 416 if (seg == NULL) { 417 rc = -ENOMEM; 418 goto out; 419 } 420 dcss_mkname (name, seg->dcss_name); 421 rc = query_segment_type (seg); 422 if (rc < 0) 423 goto out_free; 424 425 if (loadshr_scode == DCSS_LOADSHRX) { 426 if (segment_overlaps_others(seg)) { 427 rc = -EBUSY; 428 goto out_free; 429 } 430 } 431 432 rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1); 433 434 if (rc) 435 goto out_free; 436 437 seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL); 438 if (seg->res == NULL) { 439 rc = -ENOMEM; 440 goto out_shared; 441 } 442 seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 443 seg->res->start = seg->start_addr; 444 seg->res->end = seg->end; 445 memcpy(&seg->res_name, seg->dcss_name, 8); 446 EBCASC(seg->res_name, 8); 447 seg->res_name[8] = '\0'; 448 strncat(seg->res_name, " (DCSS)", 7); 449 seg->res->name = seg->res_name; 450 rc = seg->vm_segtype; 451 if (rc == SEG_TYPE_SC || 452 ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared)) 453 seg->res->flags |= IORESOURCE_READONLY; 454 if (request_resource(&iomem_resource, seg->res)) { 455 rc = -EBUSY; 456 kfree(seg->res); 457 goto out_shared; 458 } 459 460 if (do_nonshared) 461 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name, 462 &start_addr, &end_addr); 463 else 464 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name, 465 &start_addr, &end_addr); 466 if (diag_cc < 0) { 467 dcss_diag(&purgeseg_scode, seg->dcss_name, 468 &dummy, &dummy); 469 rc = diag_cc; 470 goto out_resource; 471 } 472 if (diag_cc > 1) { 473 pr_warning("Loading DCSS %s failed with rc=%ld\n", name, 474 end_addr); 475 rc = dcss_diag_translate_rc(end_addr); 476 dcss_diag(&purgeseg_scode, seg->dcss_name, 477 &dummy, &dummy); 478 goto out_resource; 479 } 480 seg->start_addr = start_addr; 481 seg->end = end_addr; 482 seg->do_nonshared = do_nonshared; 483 atomic_set(&seg->ref_count, 1); 484 list_add(&seg->list, &dcss_list); 485 *addr = seg->start_addr; 486 *end = seg->end; 487 if (do_nonshared) 488 pr_info("DCSS %s of range %p to %p and type %s loaded as " 489 "exclusive-writable\n", name, (void*) seg->start_addr, 490 (void*) seg->end, segtype_string[seg->vm_segtype]); 491 else { 492 pr_info("DCSS %s of range %p to %p and type %s loaded in " 493 "shared access mode\n", name, (void*) seg->start_addr, 494 (void*) seg->end, segtype_string[seg->vm_segtype]); 495 } 496 goto out; 497 out_resource: 498 release_resource(seg->res); 499 kfree(seg->res); 500 out_shared: 501 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); 502 out_free: 503 kfree(seg); 504 out: 505 return rc; 506 } 507 508 /* 509 * this function loads a DCSS segment 510 * name : name of the DCSS 511 * do_nonshared : 0 indicates that the dcss should be shared with other linux images 512 * 1 indicates that the dcss should be exclusive for this linux image 513 * addr : will be filled with start address of the segment 514 * end : will be filled with end address of the segment 515 * return values: 516 * -ENOSYS : we are not running on VM 517 * -EIO : could not perform query or load diagnose 518 * -ENOENT : no such segment 519 * -EOPNOTSUPP: multi-part segment cannot be used with linux 520 * -ENOSPC : segment cannot be used (overlaps with storage) 521 * -EBUSY : segment can temporarily not be used (overlaps with dcss) 522 * -ERANGE : segment cannot be used (exceeds kernel mapping range) 523 * -EPERM : segment is currently loaded with incompatible permissions 524 * -ENOMEM : out of memory 525 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h 526 */ 527 int 528 segment_load (char *name, int do_nonshared, unsigned long *addr, 529 unsigned long *end) 530 { 531 struct dcss_segment *seg; 532 int rc; 533 534 if (!MACHINE_IS_VM) 535 return -ENOSYS; 536 537 mutex_lock(&dcss_lock); 538 seg = segment_by_name (name); 539 if (seg == NULL) 540 rc = __segment_load (name, do_nonshared, addr, end); 541 else { 542 if (do_nonshared == seg->do_nonshared) { 543 atomic_inc(&seg->ref_count); 544 *addr = seg->start_addr; 545 *end = seg->end; 546 rc = seg->vm_segtype; 547 } else { 548 *addr = *end = 0; 549 rc = -EPERM; 550 } 551 } 552 mutex_unlock(&dcss_lock); 553 return rc; 554 } 555 556 /* 557 * this function modifies the shared state of a DCSS segment. note that 558 * name : name of the DCSS 559 * do_nonshared : 0 indicates that the dcss should be shared with other linux images 560 * 1 indicates that the dcss should be exclusive for this linux image 561 * return values: 562 * -EIO : could not perform load diagnose (segment gone!) 563 * -ENOENT : no such segment (segment gone!) 564 * -EAGAIN : segment is in use by other exploiters, try later 565 * -EINVAL : no segment with the given name is currently loaded - name invalid 566 * -EBUSY : segment can temporarily not be used (overlaps with dcss) 567 * 0 : operation succeeded 568 */ 569 int 570 segment_modify_shared (char *name, int do_nonshared) 571 { 572 struct dcss_segment *seg; 573 unsigned long start_addr, end_addr, dummy; 574 int rc, diag_cc; 575 576 start_addr = end_addr = 0; 577 mutex_lock(&dcss_lock); 578 seg = segment_by_name (name); 579 if (seg == NULL) { 580 rc = -EINVAL; 581 goto out_unlock; 582 } 583 if (do_nonshared == seg->do_nonshared) { 584 pr_info("DCSS %s is already in the requested access " 585 "mode\n", name); 586 rc = 0; 587 goto out_unlock; 588 } 589 if (atomic_read (&seg->ref_count) != 1) { 590 pr_warning("DCSS %s is in use and cannot be reloaded\n", 591 name); 592 rc = -EAGAIN; 593 goto out_unlock; 594 } 595 release_resource(seg->res); 596 if (do_nonshared) 597 seg->res->flags &= ~IORESOURCE_READONLY; 598 else 599 if (seg->vm_segtype == SEG_TYPE_SR || 600 seg->vm_segtype == SEG_TYPE_ER) 601 seg->res->flags |= IORESOURCE_READONLY; 602 603 if (request_resource(&iomem_resource, seg->res)) { 604 pr_warning("DCSS %s overlaps with used memory resources " 605 "and cannot be reloaded\n", name); 606 rc = -EBUSY; 607 kfree(seg->res); 608 goto out_del_mem; 609 } 610 611 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); 612 if (do_nonshared) 613 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name, 614 &start_addr, &end_addr); 615 else 616 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name, 617 &start_addr, &end_addr); 618 if (diag_cc < 0) { 619 rc = diag_cc; 620 goto out_del_res; 621 } 622 if (diag_cc > 1) { 623 pr_warning("Reloading DCSS %s failed with rc=%ld\n", name, 624 end_addr); 625 rc = dcss_diag_translate_rc(end_addr); 626 goto out_del_res; 627 } 628 seg->start_addr = start_addr; 629 seg->end = end_addr; 630 seg->do_nonshared = do_nonshared; 631 rc = 0; 632 goto out_unlock; 633 out_del_res: 634 release_resource(seg->res); 635 kfree(seg->res); 636 out_del_mem: 637 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); 638 list_del(&seg->list); 639 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); 640 kfree(seg); 641 out_unlock: 642 mutex_unlock(&dcss_lock); 643 return rc; 644 } 645 646 /* 647 * Decrease the use count of a DCSS segment and remove 648 * it from the address space if nobody is using it 649 * any longer. 650 */ 651 void 652 segment_unload(char *name) 653 { 654 unsigned long dummy; 655 struct dcss_segment *seg; 656 657 if (!MACHINE_IS_VM) 658 return; 659 660 mutex_lock(&dcss_lock); 661 seg = segment_by_name (name); 662 if (seg == NULL) { 663 pr_err("Unloading unknown DCSS %s failed\n", name); 664 goto out_unlock; 665 } 666 if (atomic_dec_return(&seg->ref_count) != 0) 667 goto out_unlock; 668 release_resource(seg->res); 669 kfree(seg->res); 670 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); 671 list_del(&seg->list); 672 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); 673 kfree(seg); 674 out_unlock: 675 mutex_unlock(&dcss_lock); 676 } 677 678 /* 679 * save segment content permanently 680 */ 681 void 682 segment_save(char *name) 683 { 684 struct dcss_segment *seg; 685 char cmd1[160]; 686 char cmd2[80]; 687 int i, response; 688 689 if (!MACHINE_IS_VM) 690 return; 691 692 mutex_lock(&dcss_lock); 693 seg = segment_by_name (name); 694 695 if (seg == NULL) { 696 pr_err("Saving unknown DCSS %s failed\n", name); 697 goto out; 698 } 699 700 sprintf(cmd1, "DEFSEG %s", name); 701 for (i=0; i<seg->segcnt; i++) { 702 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s", 703 seg->range[i].start >> PAGE_SHIFT, 704 seg->range[i].end >> PAGE_SHIFT, 705 segtype_string[seg->range[i].start & 0xff]); 706 } 707 sprintf(cmd2, "SAVESEG %s", name); 708 response = 0; 709 cpcmd(cmd1, NULL, 0, &response); 710 if (response) { 711 pr_err("Saving a DCSS failed with DEFSEG response code " 712 "%i\n", response); 713 goto out; 714 } 715 cpcmd(cmd2, NULL, 0, &response); 716 if (response) { 717 pr_err("Saving a DCSS failed with SAVESEG response code " 718 "%i\n", response); 719 goto out; 720 } 721 out: 722 mutex_unlock(&dcss_lock); 723 } 724 725 /* 726 * print appropriate error message for segment_load()/segment_type() 727 * return code 728 */ 729 void segment_warning(int rc, char *seg_name) 730 { 731 switch (rc) { 732 case -ENOENT: 733 pr_err("DCSS %s cannot be loaded or queried\n", seg_name); 734 break; 735 case -ENOSYS: 736 pr_err("DCSS %s cannot be loaded or queried without " 737 "z/VM\n", seg_name); 738 break; 739 case -EIO: 740 pr_err("Loading or querying DCSS %s resulted in a " 741 "hardware error\n", seg_name); 742 break; 743 case -EOPNOTSUPP: 744 pr_err("DCSS %s has multiple page ranges and cannot be " 745 "loaded or queried\n", seg_name); 746 break; 747 case -ENOSPC: 748 pr_err("DCSS %s overlaps with used storage and cannot " 749 "be loaded\n", seg_name); 750 break; 751 case -EBUSY: 752 pr_err("%s needs used memory resources and cannot be " 753 "loaded or queried\n", seg_name); 754 break; 755 case -EPERM: 756 pr_err("DCSS %s is already loaded in a different access " 757 "mode\n", seg_name); 758 break; 759 case -ENOMEM: 760 pr_err("There is not enough memory to load or query " 761 "DCSS %s\n", seg_name); 762 break; 763 case -ERANGE: 764 pr_err("DCSS %s exceeds the kernel mapping range (%lu) " 765 "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS); 766 break; 767 default: 768 break; 769 } 770 } 771 772 EXPORT_SYMBOL(segment_load); 773 EXPORT_SYMBOL(segment_unload); 774 EXPORT_SYMBOL(segment_save); 775 EXPORT_SYMBOL(segment_type); 776 EXPORT_SYMBOL(segment_modify_shared); 777 EXPORT_SYMBOL(segment_warning); 778