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Linux/arch/s390/mm/extmem.c

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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/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 struct qrange_old {
 55         unsigned int start; /* last byte type */
 56         unsigned int end;   /* last byte reserved */
 57 };
 58 
 59 /* output area format for the Diag x'64' old subcode x'18' */
 60 struct qout64_old {
 61         int segstart;
 62         int segend;
 63         int segcnt;
 64         int segrcnt;
 65         struct qrange_old range[6];
 66 };
 67 
 68 struct qin64 {
 69         char qopcode;
 70         char rsrv1[3];
 71         char qrcode;
 72         char rsrv2[3];
 73         char qname[8];
 74         unsigned int qoutptr;
 75         short int qoutlen;
 76 };
 77 
 78 struct dcss_segment {
 79         struct list_head list;
 80         char dcss_name[8];
 81         char res_name[15];
 82         unsigned long start_addr;
 83         unsigned long end;
 84         atomic_t ref_count;
 85         int do_nonshared;
 86         unsigned int vm_segtype;
 87         struct qrange range[6];
 88         int segcnt;
 89         struct resource *res;
 90 };
 91 
 92 static DEFINE_MUTEX(dcss_lock);
 93 static LIST_HEAD(dcss_list);
 94 static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
 95                                         "EW/EN-MIXED" };
 96 static int loadshr_scode, loadnsr_scode, findseg_scode;
 97 static int segext_scode, purgeseg_scode;
 98 static int scode_set;
 99 
100 /* set correct Diag x'64' subcodes. */
101 static int
102 dcss_set_subcodes(void)
103 {
104         char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA);
105         unsigned long rx, ry;
106         int rc;
107 
108         if (name == NULL)
109                 return -ENOMEM;
110 
111         rx = (unsigned long) name;
112         ry = DCSS_FINDSEGX;
113 
114         strcpy(name, "dummy");
115         asm volatile(
116                 "       diag    %0,%1,0x64\n"
117                 "0:     ipm     %2\n"
118                 "       srl     %2,28\n"
119                 "       j       2f\n"
120                 "1:     la      %2,3\n"
121                 "2:\n"
122                 EX_TABLE(0b, 1b)
123                 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
124 
125         kfree(name);
126         /* Diag x'64' new subcodes are supported, set to new subcodes */
127         if (rc != 3) {
128                 loadshr_scode = DCSS_LOADSHRX;
129                 loadnsr_scode = DCSS_LOADNSRX;
130                 purgeseg_scode = DCSS_PURGESEG;
131                 findseg_scode = DCSS_FINDSEGX;
132                 segext_scode = DCSS_SEGEXTX;
133                 return 0;
134         }
135         /* Diag x'64' new subcodes are not supported, set to old subcodes */
136         loadshr_scode = DCSS_LOADNOLY;
137         loadnsr_scode = DCSS_LOADNSR;
138         purgeseg_scode = DCSS_PURGESEG;
139         findseg_scode = DCSS_FINDSEG;
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  */
148 static void
149 dcss_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  */
168 static struct dcss_segment *
169 segment_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  */
191 static inline int
192 dcss_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         if (*func > DCSS_SEGEXT)
209                 asm volatile(
210                         "       diag    %0,%1,0x64\n"
211                         "       ipm     %2\n"
212                         "       srl     %2,28\n"
213                         : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
214         /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
215         else
216                 asm volatile(
217                         "       sam31\n"
218                         "       diag    %0,%1,0x64\n"
219                         "       sam64\n"
220                         "       ipm     %2\n"
221                         "       srl     %2,28\n"
222                         : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
223         *ret1 = rx;
224         *ret2 = ry;
225         return rc;
226 }
227 
228 static inline int
229 dcss_diag_translate_rc (int vm_rc) {
230         if (vm_rc == 44)
231                 return -ENOENT;
232         return -EIO;
233 }
234 
235 
236 /* do a diag to get info about a segment.
237  * fills start_address, end and vm_segtype fields
238  */
239 static int
240 query_segment_type (struct dcss_segment *seg)
241 {
242         unsigned long dummy, vmrc;
243         int diag_cc, rc, i;
244         struct qout64 *qout;
245         struct qin64 *qin;
246 
247         qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
248         qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
249         if ((qin == NULL) || (qout == NULL)) {
250                 rc = -ENOMEM;
251                 goto out_free;
252         }
253 
254         /* initialize diag input parameters */
255         qin->qopcode = DCSS_FINDSEGA;
256         qin->qoutptr = (unsigned long) qout;
257         qin->qoutlen = sizeof(struct qout64);
258         memcpy (qin->qname, seg->dcss_name, 8);
259 
260         diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
261 
262         if (diag_cc < 0) {
263                 rc = diag_cc;
264                 goto out_free;
265         }
266         if (diag_cc > 1) {
267                 pr_warning("Querying a DCSS type failed with rc=%ld\n", vmrc);
268                 rc = dcss_diag_translate_rc (vmrc);
269                 goto out_free;
270         }
271 
272         /* Only old format of output area of Diagnose x'64' is supported,
273            copy data for the new format. */
274         if (segext_scode == DCSS_SEGEXT) {
275                 struct qout64_old *qout_old;
276                 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
277                 if (qout_old == NULL) {
278                         rc = -ENOMEM;
279                         goto out_free;
280                 }
281                 memcpy(qout_old, qout, sizeof(struct qout64_old));
282                 qout->segstart = (unsigned long) qout_old->segstart;
283                 qout->segend = (unsigned long) qout_old->segend;
284                 qout->segcnt = qout_old->segcnt;
285                 qout->segrcnt = qout_old->segrcnt;
286 
287                 if (qout->segcnt > 6)
288                         qout->segrcnt = 6;
289                 for (i = 0; i < qout->segrcnt; i++) {
290                         qout->range[i].start =
291                                 (unsigned long) qout_old->range[i].start;
292                         qout->range[i].end =
293                                 (unsigned long) qout_old->range[i].end;
294                 }
295                 kfree(qout_old);
296         }
297         if (qout->segcnt > 6) {
298                 rc = -EOPNOTSUPP;
299                 goto out_free;
300         }
301 
302         if (qout->segcnt == 1) {
303                 seg->vm_segtype = qout->range[0].start & 0xff;
304         } else {
305                 /* multi-part segment. only one type supported here:
306                     - all parts are contiguous
307                     - all parts are either EW or EN type
308                     - maximum 6 parts allowed */
309                 unsigned long start = qout->segstart >> PAGE_SHIFT;
310                 for (i=0; i<qout->segcnt; i++) {
311                         if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
312                             ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
313                                 rc = -EOPNOTSUPP;
314                                 goto out_free;
315                         }
316                         if (start != qout->range[i].start >> PAGE_SHIFT) {
317                                 rc = -EOPNOTSUPP;
318                                 goto out_free;
319                         }
320                         start = (qout->range[i].end >> PAGE_SHIFT) + 1;
321                 }
322                 seg->vm_segtype = SEG_TYPE_EWEN;
323         }
324 
325         /* analyze diag output and update seg */
326         seg->start_addr = qout->segstart;
327         seg->end = qout->segend;
328 
329         memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
330         seg->segcnt = qout->segcnt;
331 
332         rc = 0;
333 
334  out_free:
335         kfree(qin);
336         kfree(qout);
337         return rc;
338 }
339 
340 /*
341  * get info about a segment
342  * possible return values:
343  * -ENOSYS  : we are not running on VM
344  * -EIO     : could not perform query diagnose
345  * -ENOENT  : no such segment
346  * -EOPNOTSUPP: multi-part segment cannot be used with linux
347  * -ENOMEM  : out of memory
348  * 0 .. 6   : type of segment as defined in include/asm-s390/extmem.h
349  */
350 int
351 segment_type (char* name)
352 {
353         int rc;
354         struct dcss_segment seg;
355 
356         if (!MACHINE_IS_VM)
357                 return -ENOSYS;
358 
359         dcss_mkname(name, seg.dcss_name);
360         rc = query_segment_type (&seg);
361         if (rc < 0)
362                 return rc;
363         return seg.vm_segtype;
364 }
365 
366 /*
367  * check if segment collides with other segments that are currently loaded
368  * returns 1 if this is the case, 0 if no collision was found
369  */
370 static int
371 segment_overlaps_others (struct dcss_segment *seg)
372 {
373         struct list_head *l;
374         struct dcss_segment *tmp;
375 
376         BUG_ON(!mutex_is_locked(&dcss_lock));
377         list_for_each(l, &dcss_list) {
378                 tmp = list_entry(l, struct dcss_segment, list);
379                 if ((tmp->start_addr >> 20) > (seg->end >> 20))
380                         continue;
381                 if ((tmp->end >> 20) < (seg->start_addr >> 20))
382                         continue;
383                 if (seg == tmp)
384                         continue;
385                 return 1;
386         }
387         return 0;
388 }
389 
390 /*
391  * real segment loading function, called from segment_load
392  */
393 static int
394 __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
395 {
396         unsigned long start_addr, end_addr, dummy;
397         struct dcss_segment *seg;
398         int rc, diag_cc;
399 
400         start_addr = end_addr = 0;
401         seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
402         if (seg == NULL) {
403                 rc = -ENOMEM;
404                 goto out;
405         }
406         dcss_mkname (name, seg->dcss_name);
407         rc = query_segment_type (seg);
408         if (rc < 0)
409                 goto out_free;
410 
411         if (loadshr_scode == DCSS_LOADSHRX) {
412                 if (segment_overlaps_others(seg)) {
413                         rc = -EBUSY;
414                         goto out_free;
415                 }
416         }
417 
418         rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
419 
420         if (rc)
421                 goto out_free;
422 
423         seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
424         if (seg->res == NULL) {
425                 rc = -ENOMEM;
426                 goto out_shared;
427         }
428         seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
429         seg->res->start = seg->start_addr;
430         seg->res->end = seg->end;
431         memcpy(&seg->res_name, seg->dcss_name, 8);
432         EBCASC(seg->res_name, 8);
433         seg->res_name[8] = '\0';
434         strncat(seg->res_name, " (DCSS)", 7);
435         seg->res->name = seg->res_name;
436         rc = seg->vm_segtype;
437         if (rc == SEG_TYPE_SC ||
438             ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
439                 seg->res->flags |= IORESOURCE_READONLY;
440         if (request_resource(&iomem_resource, seg->res)) {
441                 rc = -EBUSY;
442                 kfree(seg->res);
443                 goto out_shared;
444         }
445 
446         if (do_nonshared)
447                 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
448                                 &start_addr, &end_addr);
449         else
450                 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
451                                 &start_addr, &end_addr);
452         if (diag_cc < 0) {
453                 dcss_diag(&purgeseg_scode, seg->dcss_name,
454                                 &dummy, &dummy);
455                 rc = diag_cc;
456                 goto out_resource;
457         }
458         if (diag_cc > 1) {
459                 pr_warning("Loading DCSS %s failed with rc=%ld\n", name,
460                            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  */
513 int
514 segment_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  */
555 int
556 segment_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_warning("DCSS %s is in use and cannot be reloaded\n",
577                            name);
578                 rc = -EAGAIN;
579                 goto out_unlock;
580         }
581         release_resource(seg->res);
582         if (do_nonshared)
583                 seg->res->flags &= ~IORESOURCE_READONLY;
584         else
585                 if (seg->vm_segtype == SEG_TYPE_SR ||
586                     seg->vm_segtype == SEG_TYPE_ER)
587                         seg->res->flags |= IORESOURCE_READONLY;
588 
589         if (request_resource(&iomem_resource, seg->res)) {
590                 pr_warning("DCSS %s overlaps with used memory resources "
591                            "and cannot be reloaded\n", name);
592                 rc = -EBUSY;
593                 kfree(seg->res);
594                 goto out_del_mem;
595         }
596 
597         dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
598         if (do_nonshared)
599                 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
600                                 &start_addr, &end_addr);
601         else
602                 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
603                                 &start_addr, &end_addr);
604         if (diag_cc < 0) {
605                 rc = diag_cc;
606                 goto out_del_res;
607         }
608         if (diag_cc > 1) {
609                 pr_warning("Reloading DCSS %s failed with rc=%ld\n", name,
610                            end_addr);
611                 rc = dcss_diag_translate_rc(end_addr);
612                 goto out_del_res;
613         }
614         seg->start_addr = start_addr;
615         seg->end = end_addr;
616         seg->do_nonshared = do_nonshared;
617         rc = 0;
618         goto out_unlock;
619  out_del_res:
620         release_resource(seg->res);
621         kfree(seg->res);
622  out_del_mem:
623         vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
624         list_del(&seg->list);
625         dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
626         kfree(seg);
627  out_unlock:
628         mutex_unlock(&dcss_lock);
629         return rc;
630 }
631 
632 /*
633  * Decrease the use count of a DCSS segment and remove
634  * it from the address space if nobody is using it
635  * any longer.
636  */
637 void
638 segment_unload(char *name)
639 {
640         unsigned long dummy;
641         struct dcss_segment *seg;
642 
643         if (!MACHINE_IS_VM)
644                 return;
645 
646         mutex_lock(&dcss_lock);
647         seg = segment_by_name (name);
648         if (seg == NULL) {
649                 pr_err("Unloading unknown DCSS %s failed\n", name);
650                 goto out_unlock;
651         }
652         if (atomic_dec_return(&seg->ref_count) != 0)
653                 goto out_unlock;
654         release_resource(seg->res);
655         kfree(seg->res);
656         vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
657         list_del(&seg->list);
658         dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
659         kfree(seg);
660 out_unlock:
661         mutex_unlock(&dcss_lock);
662 }
663 
664 /*
665  * save segment content permanently
666  */
667 void
668 segment_save(char *name)
669 {
670         struct dcss_segment *seg;
671         char cmd1[160];
672         char cmd2[80];
673         int i, response;
674 
675         if (!MACHINE_IS_VM)
676                 return;
677 
678         mutex_lock(&dcss_lock);
679         seg = segment_by_name (name);
680 
681         if (seg == NULL) {
682                 pr_err("Saving unknown DCSS %s failed\n", name);
683                 goto out;
684         }
685 
686         sprintf(cmd1, "DEFSEG %s", name);
687         for (i=0; i<seg->segcnt; i++) {
688                 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
689                         seg->range[i].start >> PAGE_SHIFT,
690                         seg->range[i].end >> PAGE_SHIFT,
691                         segtype_string[seg->range[i].start & 0xff]);
692         }
693         sprintf(cmd2, "SAVESEG %s", name);
694         response = 0;
695         cpcmd(cmd1, NULL, 0, &response);
696         if (response) {
697                 pr_err("Saving a DCSS failed with DEFSEG response code "
698                        "%i\n", response);
699                 goto out;
700         }
701         cpcmd(cmd2, NULL, 0, &response);
702         if (response) {
703                 pr_err("Saving a DCSS failed with SAVESEG response code "
704                        "%i\n", response);
705                 goto out;
706         }
707 out:
708         mutex_unlock(&dcss_lock);
709 }
710 
711 /*
712  * print appropriate error message for segment_load()/segment_type()
713  * return code
714  */
715 void segment_warning(int rc, char *seg_name)
716 {
717         switch (rc) {
718         case -ENOENT:
719                 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
720                 break;
721         case -ENOSYS:
722                 pr_err("DCSS %s cannot be loaded or queried without "
723                        "z/VM\n", seg_name);
724                 break;
725         case -EIO:
726                 pr_err("Loading or querying DCSS %s resulted in a "
727                        "hardware error\n", seg_name);
728                 break;
729         case -EOPNOTSUPP:
730                 pr_err("DCSS %s has multiple page ranges and cannot be "
731                        "loaded or queried\n", seg_name);
732                 break;
733         case -ENOSPC:
734                 pr_err("DCSS %s overlaps with used storage and cannot "
735                        "be loaded\n", seg_name);
736                 break;
737         case -EBUSY:
738                 pr_err("%s needs used memory resources and cannot be "
739                        "loaded or queried\n", seg_name);
740                 break;
741         case -EPERM:
742                 pr_err("DCSS %s is already loaded in a different access "
743                        "mode\n", seg_name);
744                 break;
745         case -ENOMEM:
746                 pr_err("There is not enough memory to load or query "
747                        "DCSS %s\n", seg_name);
748                 break;
749         case -ERANGE:
750                 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
751                        "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
752                 break;
753         default:
754                 break;
755         }
756 }
757 
758 EXPORT_SYMBOL(segment_load);
759 EXPORT_SYMBOL(segment_unload);
760 EXPORT_SYMBOL(segment_save);
761 EXPORT_SYMBOL(segment_type);
762 EXPORT_SYMBOL(segment_modify_shared);
763 EXPORT_SYMBOL(segment_warning);
764 

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