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First Support on Ginger and OMAP TI
[linux-ginger.git] / arch / s390 / mm / extmem.c
blob5c8457129603233e020c6799101360707f51354c
1 /*
2 * File...........: arch/s390/mm/extmem.c
3 * Author(s)......: Carsten Otte <cotte@de.ibm.com>
4 * Rob M van der Heij <rvdheij@nl.ibm.com>
5 * Steven Shultz <shultzss@us.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * (C) IBM Corporation 2002-2004
8 */
9
10 #define KMSG_COMPONENT "extmem"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/spinlock.h>
16 #include <linux/list.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <linux/bootmem.h>
20 #include <linux/ctype.h>
21 #include <linux/ioport.h>
22 #include <asm/page.h>
23 #include <asm/pgtable.h>
24 #include <asm/ebcdic.h>
25 #include <asm/errno.h>
26 #include <asm/extmem.h>
27 #include <asm/cpcmd.h>
28 #include <asm/setup.h>
29
30 #define DCSS_LOADSHR 0x00
31 #define DCSS_LOADNSR 0x04
32 #define DCSS_PURGESEG 0x08
33 #define DCSS_FINDSEG 0x0c
34 #define DCSS_LOADNOLY 0x10
35 #define DCSS_SEGEXT 0x18
36 #define DCSS_LOADSHRX 0x20
37 #define DCSS_LOADNSRX 0x24
38 #define DCSS_FINDSEGX 0x2c
39 #define DCSS_SEGEXTX 0x38
40 #define DCSS_FINDSEGA 0x0c
41
42 struct qrange {
43 unsigned long start; /* last byte type */
44 unsigned long end; /* last byte reserved */
45 };
46
47 struct qout64 {
48 unsigned long segstart;
49 unsigned long segend;
50 int segcnt;
51 int segrcnt;
52 struct qrange range[6];
53 };
54
55 #ifdef CONFIG_64BIT
56 struct qrange_old {
57 unsigned int start; /* last byte type */
58 unsigned int end; /* last byte reserved */
59 };
60
61 /* output area format for the Diag x'64' old subcode x'18' */
62 struct qout64_old {
63 int segstart;
64 int segend;
65 int segcnt;
66 int segrcnt;
67 struct qrange_old range[6];
68 };
69 #endif
70
71 struct qin64 {
72 char qopcode;
73 char rsrv1[3];
74 char qrcode;
75 char rsrv2[3];
76 char qname[8];
77 unsigned int qoutptr;
78 short int qoutlen;
79 };
80
81 struct dcss_segment {
82 struct list_head list;
83 char dcss_name[8];
84 char res_name[15];
85 unsigned long start_addr;
86 unsigned long end;
87 atomic_t ref_count;
88 int do_nonshared;
89 unsigned int vm_segtype;
90 struct qrange range[6];
91 int segcnt;
92 struct resource *res;
93 };
94
95 static DEFINE_MUTEX(dcss_lock);
96 static LIST_HEAD(dcss_list);
97 static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
98 "EW/EN-MIXED" };
99 static int loadshr_scode, loadnsr_scode, findseg_scode;
100 static int segext_scode, purgeseg_scode;
101 static int scode_set;
102
103 /* set correct Diag x'64' subcodes. */
104 static int
105 dcss_set_subcodes(void)
106 {
107 #ifdef CONFIG_64BIT
108 char *name = kmalloc(8 * sizeof(char), GFP_DMA);
109 unsigned long rx, ry;
110 int rc;
111
112 if (name == NULL)
113 return -ENOMEM;
114
115 rx = (unsigned long) name;
116 ry = DCSS_FINDSEGX;
117
118 strcpy(name, "dummy");
119 asm volatile(
120 " diag %0,%1,0x64\n"
121 "0: ipm %2\n"
122 " srl %2,28\n"
123 " j 2f\n"
124 "1: la %2,3\n"
125 "2:\n"
126 EX_TABLE(0b, 1b)
127 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
128
129 kfree(name);
130 /* Diag x'64' new subcodes are supported, set to new subcodes */
131 if (rc != 3) {
132 loadshr_scode = DCSS_LOADSHRX;
133 loadnsr_scode = DCSS_LOADNSRX;
134 purgeseg_scode = DCSS_PURGESEG;
135 findseg_scode = DCSS_FINDSEGX;
136 segext_scode = DCSS_SEGEXTX;
137 return 0;
138 }
139 #endif
140 /* Diag x'64' new subcodes are not supported, set to old subcodes */
141 loadshr_scode = DCSS_LOADNOLY;
142 loadnsr_scode = DCSS_LOADNSR;
143 purgeseg_scode = DCSS_PURGESEG;
144 findseg_scode = DCSS_FINDSEG;
145 segext_scode = DCSS_SEGEXT;
146 return 0;
147 }
148
149 /*
150 * Create the 8 bytes, ebcdic VM segment name from
151 * an ascii name.
152 */
153 static void
154 dcss_mkname(char *name, char *dcss_name)
155 {
156 int i;
157
158 for (i = 0; i < 8; i++) {
159 if (name[i] == '\0')
160 break;
161 dcss_name[i] = toupper(name[i]);
162 };
163 for (; i < 8; i++)
164 dcss_name[i] = ' ';
165 ASCEBC(dcss_name, 8);
166 }
167
168
169 /*
170 * search all segments in dcss_list, and return the one
171 * namend *name. If not found, return NULL.
172 */
173 static struct dcss_segment *
174 segment_by_name (char *name)
175 {
176 char dcss_name[9];
177 struct list_head *l;
178 struct dcss_segment *tmp, *retval = NULL;
179
180 BUG_ON(!mutex_is_locked(&dcss_lock));
181 dcss_mkname (name, dcss_name);
182 list_for_each (l, &dcss_list) {
183 tmp = list_entry (l, struct dcss_segment, list);
184 if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
185 retval = tmp;
186 break;
187 }
188 }
189 return retval;
190 }
191
192
193 /*
194 * Perform a function on a dcss segment.
195 */
196 static inline int
197 dcss_diag(int *func, void *parameter,
198 unsigned long *ret1, unsigned long *ret2)
199 {
200 unsigned long rx, ry;
201 int rc;
202
203 if (scode_set == 0) {
204 rc = dcss_set_subcodes();
205 if (rc < 0)
206 return rc;
207 scode_set = 1;
208 }
209 rx = (unsigned long) parameter;
210 ry = (unsigned long) *func;
211
212 #ifdef CONFIG_64BIT
213 /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
214 if (*func > DCSS_SEGEXT)
215 asm volatile(
216 " diag %0,%1,0x64\n"
217 " ipm %2\n"
218 " srl %2,28\n"
219 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
220 /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
221 else
222 asm volatile(
223 " sam31\n"
224 " diag %0,%1,0x64\n"
225 " sam64\n"
226 " ipm %2\n"
227 " srl %2,28\n"
228 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
229 #else
230 asm volatile(
231 " diag %0,%1,0x64\n"
232 " ipm %2\n"
233 " srl %2,28\n"
234 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
235 #endif
236 *ret1 = rx;
237 *ret2 = ry;
238 return rc;
239 }
240
241 static inline int
242 dcss_diag_translate_rc (int vm_rc) {
243 if (vm_rc == 44)
244 return -ENOENT;
245 return -EIO;
246 }
247
248
249 /* do a diag to get info about a segment.
250 * fills start_address, end and vm_segtype fields
251 */
252 static int
253 query_segment_type (struct dcss_segment *seg)
254 {
255 struct qin64 *qin = kmalloc (sizeof(struct qin64), GFP_DMA);
256 struct qout64 *qout = kmalloc (sizeof(struct qout64), GFP_DMA);
257
258 int diag_cc, rc, i;
259 unsigned long dummy, vmrc;
260
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(struct qout64_old), 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 = -ENOTSUPP;
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 = -ENOTSUPP;
328 goto out_free;
329 }
330 if (start != qout->range[i].start >> PAGE_SHIFT) {
331 rc = -ENOTSUPP;
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 * -ENOTSUPP: 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 struct dcss_segment *seg = kmalloc(sizeof(struct dcss_segment),
411 GFP_DMA);
412 int rc, diag_cc;
413 unsigned long start_addr, end_addr, dummy;
414
415 if (seg == NULL) {
416 rc = -ENOMEM;
417 goto out;
418 }
419 dcss_mkname (name, seg->dcss_name);
420 rc = query_segment_type (seg);
421 if (rc < 0)
422 goto out_free;
423
424 if (loadshr_scode == DCSS_LOADSHRX) {
425 if (segment_overlaps_others(seg)) {
426 rc = -EBUSY;
427 goto out_free;
428 }
429 }
430
431 rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
432
433 if (rc)
434 goto out_free;
435
436 seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
437 if (seg->res == NULL) {
438 rc = -ENOMEM;
439 goto out_shared;
440 }
441 seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
442 seg->res->start = seg->start_addr;
443 seg->res->end = seg->end;
444 memcpy(&seg->res_name, seg->dcss_name, 8);
445 EBCASC(seg->res_name, 8);
446 seg->res_name[8] = '\0';
447 strncat(seg->res_name, " (DCSS)", 7);
448 seg->res->name = seg->res_name;
449 rc = seg->vm_segtype;
450 if (rc == SEG_TYPE_SC ||
451 ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
452 seg->res->flags |= IORESOURCE_READONLY;
453 if (request_resource(&iomem_resource, seg->res)) {
454 rc = -EBUSY;
455 kfree(seg->res);
456 goto out_shared;
457 }
458
459 if (do_nonshared)
460 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
461 &start_addr, &end_addr);
462 else
463 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
464 &start_addr, &end_addr);
465 if (diag_cc < 0) {
466 dcss_diag(&purgeseg_scode, seg->dcss_name,
467 &dummy, &dummy);
468 rc = diag_cc;
469 goto out_resource;
470 }
471 if (diag_cc > 1) {
472 pr_warning("Loading DCSS %s failed with rc=%ld\n", name,
473 end_addr);
474 rc = dcss_diag_translate_rc(end_addr);
475 dcss_diag(&purgeseg_scode, seg->dcss_name,
476 &dummy, &dummy);
477 goto out_resource;
478 }
479 seg->start_addr = start_addr;
480 seg->end = end_addr;
481 seg->do_nonshared = do_nonshared;
482 atomic_set(&seg->ref_count, 1);
483 list_add(&seg->list, &dcss_list);
484 *addr = seg->start_addr;
485 *end = seg->end;
486 if (do_nonshared)
487 pr_info("DCSS %s of range %p to %p and type %s loaded as "
488 "exclusive-writable\n", name, (void*) seg->start_addr,
489 (void*) seg->end, segtype_string[seg->vm_segtype]);
490 else {
491 pr_info("DCSS %s of range %p to %p and type %s loaded in "
492 "shared access mode\n", name, (void*) seg->start_addr,
493 (void*) seg->end, segtype_string[seg->vm_segtype]);
494 }
495 goto out;
496 out_resource:
497 release_resource(seg->res);
498 kfree(seg->res);
499 out_shared:
500 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
501 out_free:
502 kfree(seg);
503 out:
504 return rc;
505 }
506
507 /*
508 * this function loads a DCSS segment
509 * name : name of the DCSS
510 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
511 * 1 indicates that the dcss should be exclusive for this linux image
512 * addr : will be filled with start address of the segment
513 * end : will be filled with end address of the segment
514 * return values:
515 * -ENOSYS : we are not running on VM
516 * -EIO : could not perform query or load diagnose
517 * -ENOENT : no such segment
518 * -ENOTSUPP: multi-part segment cannot be used with linux
519 * -ENOSPC : segment cannot be used (overlaps with storage)
520 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
521 * -ERANGE : segment cannot be used (exceeds kernel mapping range)
522 * -EPERM : segment is currently loaded with incompatible permissions
523 * -ENOMEM : out of memory
524 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
525 */
526 int
527 segment_load (char *name, int do_nonshared, unsigned long *addr,
528 unsigned long *end)
529 {
530 struct dcss_segment *seg;
531 int rc;
532
533 if (!MACHINE_IS_VM)
534 return -ENOSYS;
535
536 mutex_lock(&dcss_lock);
537 seg = segment_by_name (name);
538 if (seg == NULL)
539 rc = __segment_load (name, do_nonshared, addr, end);
540 else {
541 if (do_nonshared == seg->do_nonshared) {
542 atomic_inc(&seg->ref_count);
543 *addr = seg->start_addr;
544 *end = seg->end;
545 rc = seg->vm_segtype;
546 } else {
547 *addr = *end = 0;
548 rc = -EPERM;
549 }
550 }
551 mutex_unlock(&dcss_lock);
552 return rc;
553 }
554
555 /*
556 * this function modifies the shared state of a DCSS segment. note that
557 * name : name of the DCSS
558 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
559 * 1 indicates that the dcss should be exclusive for this linux image
560 * return values:
561 * -EIO : could not perform load diagnose (segment gone!)
562 * -ENOENT : no such segment (segment gone!)
563 * -EAGAIN : segment is in use by other exploiters, try later
564 * -EINVAL : no segment with the given name is currently loaded - name invalid
565 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
566 * 0 : operation succeeded
567 */
568 int
569 segment_modify_shared (char *name, int do_nonshared)
570 {
571 struct dcss_segment *seg;
572 unsigned long start_addr, end_addr, dummy;
573 int rc, diag_cc;
574
575 mutex_lock(&dcss_lock);
576 seg = segment_by_name (name);
577 if (seg == NULL) {
578 rc = -EINVAL;
579 goto out_unlock;
580 }
581 if (do_nonshared == seg->do_nonshared) {
582 pr_info("DCSS %s is already in the requested access "
583 "mode\n", name);
584 rc = 0;
585 goto out_unlock;
586 }
587 if (atomic_read (&seg->ref_count) != 1) {
588 pr_warning("DCSS %s is in use and cannot be reloaded\n",
589 name);
590 rc = -EAGAIN;
591 goto out_unlock;
592 }
593 release_resource(seg->res);
594 if (do_nonshared)
595 seg->res->flags &= ~IORESOURCE_READONLY;
596 else
597 if (seg->vm_segtype == SEG_TYPE_SR ||
598 seg->vm_segtype == SEG_TYPE_ER)
599 seg->res->flags |= IORESOURCE_READONLY;
600
601 if (request_resource(&iomem_resource, seg->res)) {
602 pr_warning("DCSS %s overlaps with used memory resources "
603 "and cannot be reloaded\n", name);
604 rc = -EBUSY;
605 kfree(seg->res);
606 goto out_del_mem;
607 }
608
609 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
610 if (do_nonshared)
611 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
612 &start_addr, &end_addr);
613 else
614 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
615 &start_addr, &end_addr);
616 if (diag_cc < 0) {
617 rc = diag_cc;
618 goto out_del_res;
619 }
620 if (diag_cc > 1) {
621 pr_warning("Reloading DCSS %s failed with rc=%ld\n", name,
622 end_addr);
623 rc = dcss_diag_translate_rc(end_addr);
624 goto out_del_res;
625 }
626 seg->start_addr = start_addr;
627 seg->end = end_addr;
628 seg->do_nonshared = do_nonshared;
629 rc = 0;
630 goto out_unlock;
631 out_del_res:
632 release_resource(seg->res);
633 kfree(seg->res);
634 out_del_mem:
635 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
636 list_del(&seg->list);
637 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
638 kfree(seg);
639 out_unlock:
640 mutex_unlock(&dcss_lock);
641 return rc;
642 }
643
644 /*
645 * Decrease the use count of a DCSS segment and remove
646 * it from the address space if nobody is using it
647 * any longer.
648 */
649 void
650 segment_unload(char *name)
651 {
652 unsigned long dummy;
653 struct dcss_segment *seg;
654
655 if (!MACHINE_IS_VM)
656 return;
657
658 mutex_lock(&dcss_lock);
659 seg = segment_by_name (name);
660 if (seg == NULL) {
661 pr_err("Unloading unknown DCSS %s failed\n", name);
662 goto out_unlock;
663 }
664 if (atomic_dec_return(&seg->ref_count) != 0)
665 goto out_unlock;
666 release_resource(seg->res);
667 kfree(seg->res);
668 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
669 list_del(&seg->list);
670 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
671 kfree(seg);
672 out_unlock:
673 mutex_unlock(&dcss_lock);
674 }
675
676 /*
677 * save segment content permanently
678 */
679 void
680 segment_save(char *name)
681 {
682 struct dcss_segment *seg;
683 int startpfn = 0;
684 int endpfn = 0;
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 startpfn = seg->start_addr >> PAGE_SHIFT;
701 endpfn = (seg->end) >> PAGE_SHIFT;
702 sprintf(cmd1, "DEFSEG %s", name);
703 for (i=0; i<seg->segcnt; i++) {
704 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
705 seg->range[i].start >> PAGE_SHIFT,
706 seg->range[i].end >> PAGE_SHIFT,
707 segtype_string[seg->range[i].start & 0xff]);
708 }
709 sprintf(cmd2, "SAVESEG %s", name);
710 response = 0;
711 cpcmd(cmd1, NULL, 0, &response);
712 if (response) {
713 pr_err("Saving a DCSS failed with DEFSEG response code "
714 "%i\n", response);
715 goto out;
716 }
717 cpcmd(cmd2, NULL, 0, &response);
718 if (response) {
719 pr_err("Saving a DCSS failed with SAVESEG response code "
720 "%i\n", response);
721 goto out;
722 }
723 out:
724 mutex_unlock(&dcss_lock);
725 }
726
727 /*
728 * print appropriate error message for segment_load()/segment_type()
729 * return code
730 */
731 void segment_warning(int rc, char *seg_name)
732 {
733 switch (rc) {
734 case -ENOENT:
735 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
736 break;
737 case -ENOSYS:
738 pr_err("DCSS %s cannot be loaded or queried without "
739 "z/VM\n", seg_name);
740 break;
741 case -EIO:
742 pr_err("Loading or querying DCSS %s resulted in a "
743 "hardware error\n", seg_name);
744 break;
745 case -ENOTSUPP:
746 pr_err("DCSS %s has multiple page ranges and cannot be "
747 "loaded or queried\n", seg_name);
748 break;
749 case -ENOSPC:
750 pr_err("DCSS %s overlaps with used storage and cannot "
751 "be loaded\n", seg_name);
752 break;
753 case -EBUSY:
754 pr_err("%s needs used memory resources and cannot be "
755 "loaded or queried\n", seg_name);
756 break;
757 case -EPERM:
758 pr_err("DCSS %s is already loaded in a different access "
759 "mode\n", seg_name);
760 break;
761 case -ENOMEM:
762 pr_err("There is not enough memory to load or query "
763 "DCSS %s\n", seg_name);
764 break;
765 case -ERANGE:
766 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
767 "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
768 break;
769 default:
770 break;
771 }
772 }
773
774 EXPORT_SYMBOL(segment_load);
775 EXPORT_SYMBOL(segment_unload);
776 EXPORT_SYMBOL(segment_save);
777 EXPORT_SYMBOL(segment_type);
778 EXPORT_SYMBOL(segment_modify_shared);
779 EXPORT_SYMBOL(segment_warning);
Linux for Ginger Game Console