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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/diag.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
42struct qrange {
43 unsigned long start; /* last byte type */
44 unsigned long end; /* last byte reserved */
45};
46
47struct qout64 {
48 unsigned long segstart;
49 unsigned long segend;
50 int segcnt;
51 int segrcnt;
52 struct qrange range[6];
53};
54
55struct 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' */
61struct qout64_old {
62 int segstart;
63 int segend;
64 int segcnt;
65 int segrcnt;
66 struct qrange_old range[6];
67};
68
69struct qin64 {
70 char qopcode;
71 char rsrv1[3];
72 char qrcode;
73 char rsrv2[3];
74 char qname[8];
75 unsigned int qoutptr;
76 short int qoutlen;
77};
78
79struct dcss_segment {
80 struct list_head list;
81 char dcss_name[8];
82 char res_name[15];
83 unsigned long start_addr;
84 unsigned long end;
85 atomic_t ref_count;
86 int do_nonshared;
87 unsigned int vm_segtype;
88 struct qrange range[6];
89 int segcnt;
90 struct resource *res;
91};
92
93static DEFINE_MUTEX(dcss_lock);
94static LIST_HEAD(dcss_list);
95static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
96 "EW/EN-MIXED" };
97static int loadshr_scode, loadnsr_scode;
98static int segext_scode, purgeseg_scode;
99static int scode_set;
100
101/* set correct Diag x'64' subcodes. */
102static int
103dcss_set_subcodes(void)
104{
105 char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA);
106 unsigned long rx, ry;
107 int rc;
108
109 if (name == NULL)
110 return -ENOMEM;
111
112 rx = (unsigned long) name;
113 ry = DCSS_FINDSEGX;
114
115 strcpy(name, "dummy");
116 diag_stat_inc(DIAG_STAT_X064);
117 asm volatile(
118 " diag %0,%1,0x64\n"
119 "0: ipm %2\n"
120 " srl %2,28\n"
121 " j 2f\n"
122 "1: la %2,3\n"
123 "2:\n"
124 EX_TABLE(0b, 1b)
125 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
126
127 kfree(name);
128 /* Diag x'64' new subcodes are supported, set to new subcodes */
129 if (rc != 3) {
130 loadshr_scode = DCSS_LOADSHRX;
131 loadnsr_scode = DCSS_LOADNSRX;
132 purgeseg_scode = DCSS_PURGESEG;
133 segext_scode = DCSS_SEGEXTX;
134 return 0;
135 }
136 /* Diag x'64' new subcodes are not supported, set to old subcodes */
137 loadshr_scode = DCSS_LOADNOLY;
138 loadnsr_scode = DCSS_LOADNSR;
139 purgeseg_scode = DCSS_PURGESEG;
140 segext_scode = DCSS_SEGEXT;
141 return 0;
142}
143
144/*
145 * Create the 8 bytes, ebcdic VM segment name from
146 * an ascii name.
147 */
148static void
149dcss_mkname(char *name, char *dcss_name)
150{
151 int i;
152
153 for (i = 0; i < 8; i++) {
154 if (name[i] == '\0')
155 break;
156 dcss_name[i] = toupper(name[i]);
157 };
158 for (; i < 8; i++)
159 dcss_name[i] = ' ';
160 ASCEBC(dcss_name, 8);
161}
162
163
164/*
165 * search all segments in dcss_list, and return the one
166 * namend *name. If not found, return NULL.
167 */
168static struct dcss_segment *
169segment_by_name (char *name)
170{
171 char dcss_name[9];
172 struct list_head *l;
173 struct dcss_segment *tmp, *retval = NULL;
174
175 BUG_ON(!mutex_is_locked(&dcss_lock));
176 dcss_mkname (name, dcss_name);
177 list_for_each (l, &dcss_list) {
178 tmp = list_entry (l, struct dcss_segment, list);
179 if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
180 retval = tmp;
181 break;
182 }
183 }
184 return retval;
185}
186
187
188/*
189 * Perform a function on a dcss segment.
190 */
191static inline int
192dcss_diag(int *func, void *parameter,
193 unsigned long *ret1, unsigned long *ret2)
194{
195 unsigned long rx, ry;
196 int rc;
197
198 if (scode_set == 0) {
199 rc = dcss_set_subcodes();
200 if (rc < 0)
201 return rc;
202 scode_set = 1;
203 }
204 rx = (unsigned long) parameter;
205 ry = (unsigned long) *func;
206
207 /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
208 diag_stat_inc(DIAG_STAT_X064);
209 if (*func > DCSS_SEGEXT)
210 asm volatile(
211 " diag %0,%1,0x64\n"
212 " ipm %2\n"
213 " srl %2,28\n"
214 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
215 /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
216 else
217 asm volatile(
218 " sam31\n"
219 " diag %0,%1,0x64\n"
220 " sam64\n"
221 " ipm %2\n"
222 " srl %2,28\n"
223 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
224 *ret1 = rx;
225 *ret2 = ry;
226 return rc;
227}
228
229static inline int
230dcss_diag_translate_rc (int vm_rc) {
231 if (vm_rc == 44)
232 return -ENOENT;
233 return -EIO;
234}
235
236
237/* do a diag to get info about a segment.
238 * fills start_address, end and vm_segtype fields
239 */
240static int
241query_segment_type (struct dcss_segment *seg)
242{
243 unsigned long dummy, vmrc;
244 int diag_cc, rc, i;
245 struct qout64 *qout;
246 struct qin64 *qin;
247
248 qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
249 qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
250 if ((qin == NULL) || (qout == NULL)) {
251 rc = -ENOMEM;
252 goto out_free;
253 }
254
255 /* initialize diag input parameters */
256 qin->qopcode = DCSS_FINDSEGA;
257 qin->qoutptr = (unsigned long) qout;
258 qin->qoutlen = sizeof(struct qout64);
259 memcpy (qin->qname, seg->dcss_name, 8);
260
261 diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
262
263 if (diag_cc < 0) {
264 rc = diag_cc;
265 goto out_free;
266 }
267 if (diag_cc > 1) {
268 pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc);
269 rc = dcss_diag_translate_rc (vmrc);
270 goto out_free;
271 }
272
273 /* Only old format of output area of Diagnose x'64' is supported,
274 copy data for the new format. */
275 if (segext_scode == DCSS_SEGEXT) {
276 struct qout64_old *qout_old;
277 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
278 if (qout_old == NULL) {
279 rc = -ENOMEM;
280 goto out_free;
281 }
282 memcpy(qout_old, qout, sizeof(struct qout64_old));
283 qout->segstart = (unsigned long) qout_old->segstart;
284 qout->segend = (unsigned long) qout_old->segend;
285 qout->segcnt = qout_old->segcnt;
286 qout->segrcnt = qout_old->segrcnt;
287
288 if (qout->segcnt > 6)
289 qout->segrcnt = 6;
290 for (i = 0; i < qout->segrcnt; i++) {
291 qout->range[i].start =
292 (unsigned long) qout_old->range[i].start;
293 qout->range[i].end =
294 (unsigned long) qout_old->range[i].end;
295 }
296 kfree(qout_old);
297 }
298 if (qout->segcnt > 6) {
299 rc = -EOPNOTSUPP;
300 goto out_free;
301 }
302
303 if (qout->segcnt == 1) {
304 seg->vm_segtype = qout->range[0].start & 0xff;
305 } else {
306 /* multi-part segment. only one type supported here:
307 - all parts are contiguous
308 - all parts are either EW or EN type
309 - maximum 6 parts allowed */
310 unsigned long start = qout->segstart >> PAGE_SHIFT;
311 for (i=0; i<qout->segcnt; i++) {
312 if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
313 ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
314 rc = -EOPNOTSUPP;
315 goto out_free;
316 }
317 if (start != qout->range[i].start >> PAGE_SHIFT) {
318 rc = -EOPNOTSUPP;
319 goto out_free;
320 }
321 start = (qout->range[i].end >> PAGE_SHIFT) + 1;
322 }
323 seg->vm_segtype = SEG_TYPE_EWEN;
324 }
325
326 /* analyze diag output and update seg */
327 seg->start_addr = qout->segstart;
328 seg->end = qout->segend;
329
330 memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
331 seg->segcnt = qout->segcnt;
332
333 rc = 0;
334
335 out_free:
336 kfree(qin);
337 kfree(qout);
338 return rc;
339}
340
341/*
342 * get info about a segment
343 * possible return values:
344 * -ENOSYS : we are not running on VM
345 * -EIO : could not perform query diagnose
346 * -ENOENT : no such segment
347 * -EOPNOTSUPP: multi-part segment cannot be used with linux
348 * -ENOMEM : out of memory
349 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
350 */
351int
352segment_type (char* name)
353{
354 int rc;
355 struct dcss_segment seg;
356
357 if (!MACHINE_IS_VM)
358 return -ENOSYS;
359
360 dcss_mkname(name, seg.dcss_name);
361 rc = query_segment_type (&seg);
362 if (rc < 0)
363 return rc;
364 return seg.vm_segtype;
365}
366
367/*
368 * check if segment collides with other segments that are currently loaded
369 * returns 1 if this is the case, 0 if no collision was found
370 */
371static int
372segment_overlaps_others (struct dcss_segment *seg)
373{
374 struct list_head *l;
375 struct dcss_segment *tmp;
376
377 BUG_ON(!mutex_is_locked(&dcss_lock));
378 list_for_each(l, &dcss_list) {
379 tmp = list_entry(l, struct dcss_segment, list);
380 if ((tmp->start_addr >> 20) > (seg->end >> 20))
381 continue;
382 if ((tmp->end >> 20) < (seg->start_addr >> 20))
383 continue;
384 if (seg == tmp)
385 continue;
386 return 1;
387 }
388 return 0;
389}
390
391/*
392 * real segment loading function, called from segment_load
393 */
394static int
395__segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
396{
397 unsigned long start_addr, end_addr, dummy;
398 struct dcss_segment *seg;
399 int rc, diag_cc;
400
401 start_addr = end_addr = 0;
402 seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
403 if (seg == NULL) {
404 rc = -ENOMEM;
405 goto out;
406 }
407 dcss_mkname (name, seg->dcss_name);
408 rc = query_segment_type (seg);
409 if (rc < 0)
410 goto out_free;
411
412 if (loadshr_scode == DCSS_LOADSHRX) {
413 if (segment_overlaps_others(seg)) {
414 rc = -EBUSY;
415 goto out_free;
416 }
417 }
418
419 rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
420
421 if (rc)
422 goto out_free;
423
424 seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
425 if (seg->res == NULL) {
426 rc = -ENOMEM;
427 goto out_shared;
428 }
429 seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
430 seg->res->start = seg->start_addr;
431 seg->res->end = seg->end;
432 memcpy(&seg->res_name, seg->dcss_name, 8);
433 EBCASC(seg->res_name, 8);
434 seg->res_name[8] = '\0';
435 strncat(seg->res_name, " (DCSS)", 7);
436 seg->res->name = seg->res_name;
437 rc = seg->vm_segtype;
438 if (rc == SEG_TYPE_SC ||
439 ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
440 seg->res->flags |= IORESOURCE_READONLY;
441 if (request_resource(&iomem_resource, seg->res)) {
442 rc = -EBUSY;
443 kfree(seg->res);
444 goto out_shared;
445 }
446
447 if (do_nonshared)
448 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
449 &start_addr, &end_addr);
450 else
451 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
452 &start_addr, &end_addr);
453 if (diag_cc < 0) {
454 dcss_diag(&purgeseg_scode, seg->dcss_name,
455 &dummy, &dummy);
456 rc = diag_cc;
457 goto out_resource;
458 }
459 if (diag_cc > 1) {
460 pr_warn("Loading DCSS %s failed with rc=%ld\n", name, end_addr);
461 rc = dcss_diag_translate_rc(end_addr);
462 dcss_diag(&purgeseg_scode, seg->dcss_name,
463 &dummy, &dummy);
464 goto out_resource;
465 }
466 seg->start_addr = start_addr;
467 seg->end = end_addr;
468 seg->do_nonshared = do_nonshared;
469 atomic_set(&seg->ref_count, 1);
470 list_add(&seg->list, &dcss_list);
471 *addr = seg->start_addr;
472 *end = seg->end;
473 if (do_nonshared)
474 pr_info("DCSS %s of range %p to %p and type %s loaded as "
475 "exclusive-writable\n", name, (void*) seg->start_addr,
476 (void*) seg->end, segtype_string[seg->vm_segtype]);
477 else {
478 pr_info("DCSS %s of range %p to %p and type %s loaded in "
479 "shared access mode\n", name, (void*) seg->start_addr,
480 (void*) seg->end, segtype_string[seg->vm_segtype]);
481 }
482 goto out;
483 out_resource:
484 release_resource(seg->res);
485 kfree(seg->res);
486 out_shared:
487 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
488 out_free:
489 kfree(seg);
490 out:
491 return rc;
492}
493
494/*
495 * this function loads a DCSS segment
496 * name : name of the DCSS
497 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
498 * 1 indicates that the dcss should be exclusive for this linux image
499 * addr : will be filled with start address of the segment
500 * end : will be filled with end address of the segment
501 * return values:
502 * -ENOSYS : we are not running on VM
503 * -EIO : could not perform query or load diagnose
504 * -ENOENT : no such segment
505 * -EOPNOTSUPP: multi-part segment cannot be used with linux
506 * -ENOSPC : segment cannot be used (overlaps with storage)
507 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
508 * -ERANGE : segment cannot be used (exceeds kernel mapping range)
509 * -EPERM : segment is currently loaded with incompatible permissions
510 * -ENOMEM : out of memory
511 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
512 */
513int
514segment_load (char *name, int do_nonshared, unsigned long *addr,
515 unsigned long *end)
516{
517 struct dcss_segment *seg;
518 int rc;
519
520 if (!MACHINE_IS_VM)
521 return -ENOSYS;
522
523 mutex_lock(&dcss_lock);
524 seg = segment_by_name (name);
525 if (seg == NULL)
526 rc = __segment_load (name, do_nonshared, addr, end);
527 else {
528 if (do_nonshared == seg->do_nonshared) {
529 atomic_inc(&seg->ref_count);
530 *addr = seg->start_addr;
531 *end = seg->end;
532 rc = seg->vm_segtype;
533 } else {
534 *addr = *end = 0;
535 rc = -EPERM;
536 }
537 }
538 mutex_unlock(&dcss_lock);
539 return rc;
540}
541
542/*
543 * this function modifies the shared state of a DCSS segment. note that
544 * name : name of the DCSS
545 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
546 * 1 indicates that the dcss should be exclusive for this linux image
547 * return values:
548 * -EIO : could not perform load diagnose (segment gone!)
549 * -ENOENT : no such segment (segment gone!)
550 * -EAGAIN : segment is in use by other exploiters, try later
551 * -EINVAL : no segment with the given name is currently loaded - name invalid
552 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
553 * 0 : operation succeeded
554 */
555int
556segment_modify_shared (char *name, int do_nonshared)
557{
558 struct dcss_segment *seg;
559 unsigned long start_addr, end_addr, dummy;
560 int rc, diag_cc;
561
562 start_addr = end_addr = 0;
563 mutex_lock(&dcss_lock);
564 seg = segment_by_name (name);
565 if (seg == NULL) {
566 rc = -EINVAL;
567 goto out_unlock;
568 }
569 if (do_nonshared == seg->do_nonshared) {
570 pr_info("DCSS %s is already in the requested access "
571 "mode\n", name);
572 rc = 0;
573 goto out_unlock;
574 }
575 if (atomic_read (&seg->ref_count) != 1) {
576 pr_warn("DCSS %s is in use and cannot be reloaded\n", name);
577 rc = -EAGAIN;
578 goto out_unlock;
579 }
580 release_resource(seg->res);
581 if (do_nonshared)
582 seg->res->flags &= ~IORESOURCE_READONLY;
583 else
584 if (seg->vm_segtype == SEG_TYPE_SR ||
585 seg->vm_segtype == SEG_TYPE_ER)
586 seg->res->flags |= IORESOURCE_READONLY;
587
588 if (request_resource(&iomem_resource, seg->res)) {
589 pr_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n",
590 name);
591 rc = -EBUSY;
592 kfree(seg->res);
593 goto out_del_mem;
594 }
595
596 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
597 if (do_nonshared)
598 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
599 &start_addr, &end_addr);
600 else
601 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
602 &start_addr, &end_addr);
603 if (diag_cc < 0) {
604 rc = diag_cc;
605 goto out_del_res;
606 }
607 if (diag_cc > 1) {
608 pr_warn("Reloading DCSS %s failed with rc=%ld\n",
609 name, end_addr);
610 rc = dcss_diag_translate_rc(end_addr);
611 goto out_del_res;
612 }
613 seg->start_addr = start_addr;
614 seg->end = end_addr;
615 seg->do_nonshared = do_nonshared;
616 rc = 0;
617 goto out_unlock;
618 out_del_res:
619 release_resource(seg->res);
620 kfree(seg->res);
621 out_del_mem:
622 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
623 list_del(&seg->list);
624 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
625 kfree(seg);
626 out_unlock:
627 mutex_unlock(&dcss_lock);
628 return rc;
629}
630
631/*
632 * Decrease the use count of a DCSS segment and remove
633 * it from the address space if nobody is using it
634 * any longer.
635 */
636void
637segment_unload(char *name)
638{
639 unsigned long dummy;
640 struct dcss_segment *seg;
641
642 if (!MACHINE_IS_VM)
643 return;
644
645 mutex_lock(&dcss_lock);
646 seg = segment_by_name (name);
647 if (seg == NULL) {
648 pr_err("Unloading unknown DCSS %s failed\n", name);
649 goto out_unlock;
650 }
651 if (atomic_dec_return(&seg->ref_count) != 0)
652 goto out_unlock;
653 release_resource(seg->res);
654 kfree(seg->res);
655 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
656 list_del(&seg->list);
657 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
658 kfree(seg);
659out_unlock:
660 mutex_unlock(&dcss_lock);
661}
662
663/*
664 * save segment content permanently
665 */
666void
667segment_save(char *name)
668{
669 struct dcss_segment *seg;
670 char cmd1[160];
671 char cmd2[80];
672 int i, response;
673
674 if (!MACHINE_IS_VM)
675 return;
676
677 mutex_lock(&dcss_lock);
678 seg = segment_by_name (name);
679
680 if (seg == NULL) {
681 pr_err("Saving unknown DCSS %s failed\n", name);
682 goto out;
683 }
684
685 sprintf(cmd1, "DEFSEG %s", name);
686 for (i=0; i<seg->segcnt; i++) {
687 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
688 seg->range[i].start >> PAGE_SHIFT,
689 seg->range[i].end >> PAGE_SHIFT,
690 segtype_string[seg->range[i].start & 0xff]);
691 }
692 sprintf(cmd2, "SAVESEG %s", name);
693 response = 0;
694 cpcmd(cmd1, NULL, 0, &response);
695 if (response) {
696 pr_err("Saving a DCSS failed with DEFSEG response code "
697 "%i\n", response);
698 goto out;
699 }
700 cpcmd(cmd2, NULL, 0, &response);
701 if (response) {
702 pr_err("Saving a DCSS failed with SAVESEG response code "
703 "%i\n", response);
704 goto out;
705 }
706out:
707 mutex_unlock(&dcss_lock);
708}
709
710/*
711 * print appropriate error message for segment_load()/segment_type()
712 * return code
713 */
714void segment_warning(int rc, char *seg_name)
715{
716 switch (rc) {
717 case -ENOENT:
718 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
719 break;
720 case -ENOSYS:
721 pr_err("DCSS %s cannot be loaded or queried without "
722 "z/VM\n", seg_name);
723 break;
724 case -EIO:
725 pr_err("Loading or querying DCSS %s resulted in a "
726 "hardware error\n", seg_name);
727 break;
728 case -EOPNOTSUPP:
729 pr_err("DCSS %s has multiple page ranges and cannot be "
730 "loaded or queried\n", seg_name);
731 break;
732 case -ENOSPC:
733 pr_err("DCSS %s overlaps with used storage and cannot "
734 "be loaded\n", seg_name);
735 break;
736 case -EBUSY:
737 pr_err("%s needs used memory resources and cannot be "
738 "loaded or queried\n", seg_name);
739 break;
740 case -EPERM:
741 pr_err("DCSS %s is already loaded in a different access "
742 "mode\n", seg_name);
743 break;
744 case -ENOMEM:
745 pr_err("There is not enough memory to load or query "
746 "DCSS %s\n", seg_name);
747 break;
748 case -ERANGE:
749 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
750 "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
751 break;
752 default:
753 break;
754 }
755}
756
757EXPORT_SYMBOL(segment_load);
758EXPORT_SYMBOL(segment_unload);
759EXPORT_SYMBOL(segment_save);
760EXPORT_SYMBOL(segment_type);
761EXPORT_SYMBOL(segment_modify_shared);
762EXPORT_SYMBOL(segment_warning);
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
41struct qrange {
42 unsigned long start; /* last byte type */
43 unsigned long end; /* last byte reserved */
44};
45
46struct 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
55struct 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' */
61struct qout64_old {
62 int segstart;
63 int segend;
64 int segcnt;
65 int segrcnt;
66 struct qrange_old range[6];
67};
68#endif
69
70struct 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
80struct 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
94static DEFINE_MUTEX(dcss_lock);
95static LIST_HEAD(dcss_list);
96static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
97 "EW/EN-MIXED" };
98static int loadshr_scode, loadnsr_scode, findseg_scode;
99static int segext_scode, purgeseg_scode;
100static int scode_set;
101
102/* set correct Diag x'64' subcodes. */
103static int
104dcss_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 */
152static void
153dcss_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 */
172static struct dcss_segment *
173segment_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 */
195static inline int
196dcss_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
240static inline int
241dcss_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 */
251static int
252query_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 */
364int
365segment_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 */
384static int
385segment_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 */
407static 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 */
527int
528segment_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 */
569int
570segment_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 */
651void
652segment_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);
674out_unlock:
675 mutex_unlock(&dcss_lock);
676}
677
678/*
679 * save segment content permanently
680 */
681void
682segment_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 }
721out:
722 mutex_unlock(&dcss_lock);
723}
724
725/*
726 * print appropriate error message for segment_load()/segment_type()
727 * return code
728 */
729void 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
772EXPORT_SYMBOL(segment_load);
773EXPORT_SYMBOL(segment_unload);
774EXPORT_SYMBOL(segment_save);
775EXPORT_SYMBOL(segment_type);
776EXPORT_SYMBOL(segment_modify_shared);
777EXPORT_SYMBOL(segment_warning);