x86/PCI: truncate _CRS windows with _LEN > _MAX - _MIN + 1
[linux-2.6.git] / arch / s390 / mm / extmem.c
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 = -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         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  * -EOPNOTSUPP: 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 -EOPNOTSUPP:
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);