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TOMOYO Linux Cross Reference
Linux/arch/s390/mm/extmem.c

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  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_KERNEL | 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         unsigned long dummy, vmrc;
256         int diag_cc, rc, i;
257         struct qout64 *qout;
258         struct qin64 *qin;
259 
260         qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
261         qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
262         if ((qin == NULL) || (qout == NULL)) {
263                 rc = -ENOMEM;
264                 goto out_free;
265         }
266 
267         /* initialize diag input parameters */
268         qin->qopcode = DCSS_FINDSEGA;
269         qin->qoutptr = (unsigned long) qout;
270         qin->qoutlen = sizeof(struct qout64);
271         memcpy (qin->qname, seg->dcss_name, 8);
272 
273         diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
274 
275         if (diag_cc < 0) {
276                 rc = diag_cc;
277                 goto out_free;
278         }
279         if (diag_cc > 1) {
280                 pr_warning("Querying a DCSS type failed with rc=%ld\n", vmrc);
281                 rc = dcss_diag_translate_rc (vmrc);
282                 goto out_free;
283         }
284 
285 #ifdef CONFIG_64BIT
286         /* Only old format of output area of Diagnose x'64' is supported,
287            copy data for the new format. */
288         if (segext_scode == DCSS_SEGEXT) {
289                 struct qout64_old *qout_old;
290                 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
291                 if (qout_old == NULL) {
292                         rc = -ENOMEM;
293                         goto out_free;
294                 }
295                 memcpy(qout_old, qout, sizeof(struct qout64_old));
296                 qout->segstart = (unsigned long) qout_old->segstart;
297                 qout->segend = (unsigned long) qout_old->segend;
298                 qout->segcnt = qout_old->segcnt;
299                 qout->segrcnt = qout_old->segrcnt;
300 
301                 if (qout->segcnt > 6)
302                         qout->segrcnt = 6;
303                 for (i = 0; i < qout->segrcnt; i++) {
304                         qout->range[i].start =
305                                 (unsigned long) qout_old->range[i].start;
306                         qout->range[i].end =
307                                 (unsigned long) qout_old->range[i].end;
308                 }
309                 kfree(qout_old);
310         }
311 #endif
312         if (qout->segcnt > 6) {
313                 rc = -EOPNOTSUPP;
314                 goto out_free;
315         }
316 
317         if (qout->segcnt == 1) {
318                 seg->vm_segtype = qout->range[0].start & 0xff;
319         } else {
320                 /* multi-part segment. only one type supported here:
321                     - all parts are contiguous
322                     - all parts are either EW or EN type
323                     - maximum 6 parts allowed */
324                 unsigned long start = qout->segstart >> PAGE_SHIFT;
325                 for (i=0; i<qout->segcnt; i++) {
326                         if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
327                             ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
328                                 rc = -EOPNOTSUPP;
329                                 goto out_free;
330                         }
331                         if (start != qout->range[i].start >> PAGE_SHIFT) {
332                                 rc = -EOPNOTSUPP;
333                                 goto out_free;
334                         }
335                         start = (qout->range[i].end >> PAGE_SHIFT) + 1;
336                 }
337                 seg->vm_segtype = SEG_TYPE_EWEN;
338         }
339 
340         /* analyze diag output and update seg */
341         seg->start_addr = qout->segstart;
342         seg->end = qout->segend;
343 
344         memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
345         seg->segcnt = qout->segcnt;
346 
347         rc = 0;
348 
349  out_free:
350         kfree(qin);
351         kfree(qout);
352         return rc;
353 }
354 
355 /*
356  * get info about a segment
357  * possible return values:
358  * -ENOSYS  : we are not running on VM
359  * -EIO     : could not perform query diagnose
360  * -ENOENT  : no such segment
361  * -EOPNOTSUPP: multi-part segment cannot be used with linux
362  * -ENOMEM  : out of memory
363  * 0 .. 6   : type of segment as defined in include/asm-s390/extmem.h
364  */
365 int
366 segment_type (char* name)
367 {
368         int rc;
369         struct dcss_segment seg;
370 
371         if (!MACHINE_IS_VM)
372                 return -ENOSYS;
373 
374         dcss_mkname(name, seg.dcss_name);
375         rc = query_segment_type (&seg);
376         if (rc < 0)
377                 return rc;
378         return seg.vm_segtype;
379 }
380 
381 /*
382  * check if segment collides with other segments that are currently loaded
383  * returns 1 if this is the case, 0 if no collision was found
384  */
385 static int
386 segment_overlaps_others (struct dcss_segment *seg)
387 {
388         struct list_head *l;
389         struct dcss_segment *tmp;
390 
391         BUG_ON(!mutex_is_locked(&dcss_lock));
392         list_for_each(l, &dcss_list) {
393                 tmp = list_entry(l, struct dcss_segment, list);
394                 if ((tmp->start_addr >> 20) > (seg->end >> 20))
395                         continue;
396                 if ((tmp->end >> 20) < (seg->start_addr >> 20))
397                         continue;
398                 if (seg == tmp)
399                         continue;
400                 return 1;
401         }
402         return 0;
403 }
404 
405 /*
406  * real segment loading function, called from segment_load
407  */
408 static int
409 __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
410 {
411         unsigned long start_addr, end_addr, dummy;
412         struct dcss_segment *seg;
413         int rc, diag_cc;
414 
415         start_addr = end_addr = 0;
416         seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
417         if (seg == NULL) {
418                 rc = -ENOMEM;
419                 goto out;
420         }
421         dcss_mkname (name, seg->dcss_name);
422         rc = query_segment_type (seg);
423         if (rc < 0)
424                 goto out_free;
425 
426         if (loadshr_scode == DCSS_LOADSHRX) {
427                 if (segment_overlaps_others(seg)) {
428                         rc = -EBUSY;
429                         goto out_free;
430                 }
431         }
432 
433         rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
434 
435         if (rc)
436                 goto out_free;
437 
438         seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
439         if (seg->res == NULL) {
440                 rc = -ENOMEM;
441                 goto out_shared;
442         }
443         seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
444         seg->res->start = seg->start_addr;
445         seg->res->end = seg->end;
446         memcpy(&seg->res_name, seg->dcss_name, 8);
447         EBCASC(seg->res_name, 8);
448         seg->res_name[8] = '\0';
449         strncat(seg->res_name, " (DCSS)", 7);
450         seg->res->name = seg->res_name;
451         rc = seg->vm_segtype;
452         if (rc == SEG_TYPE_SC ||
453             ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
454                 seg->res->flags |= IORESOURCE_READONLY;
455         if (request_resource(&iomem_resource, seg->res)) {
456                 rc = -EBUSY;
457                 kfree(seg->res);
458                 goto out_shared;
459         }
460 
461         if (do_nonshared)
462                 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
463                                 &start_addr, &end_addr);
464         else
465                 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
466                                 &start_addr, &end_addr);
467         if (diag_cc < 0) {
468                 dcss_diag(&purgeseg_scode, seg->dcss_name,
469                                 &dummy, &dummy);
470                 rc = diag_cc;
471                 goto out_resource;
472         }
473         if (diag_cc > 1) {
474                 pr_warning("Loading DCSS %s failed with rc=%ld\n", name,
475                            end_addr);
476                 rc = dcss_diag_translate_rc(end_addr);
477                 dcss_diag(&purgeseg_scode, seg->dcss_name,
478                                 &dummy, &dummy);
479                 goto out_resource;
480         }
481         seg->start_addr = start_addr;
482         seg->end = end_addr;
483         seg->do_nonshared = do_nonshared;
484         atomic_set(&seg->ref_count, 1);
485         list_add(&seg->list, &dcss_list);
486         *addr = seg->start_addr;
487         *end  = seg->end;
488         if (do_nonshared)
489                 pr_info("DCSS %s of range %p to %p and type %s loaded as "
490                         "exclusive-writable\n", name, (void*) seg->start_addr,
491                         (void*) seg->end, segtype_string[seg->vm_segtype]);
492         else {
493                 pr_info("DCSS %s of range %p to %p and type %s loaded in "
494                         "shared access mode\n", name, (void*) seg->start_addr,
495                         (void*) seg->end, segtype_string[seg->vm_segtype]);
496         }
497         goto out;
498  out_resource:
499         release_resource(seg->res);
500         kfree(seg->res);
501  out_shared:
502         vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
503  out_free:
504         kfree(seg);
505  out:
506         return rc;
507 }
508 
509 /*
510  * this function loads a DCSS segment
511  * name         : name of the DCSS
512  * do_nonshared : 0 indicates that the dcss should be shared with other linux images
513  *                1 indicates that the dcss should be exclusive for this linux image
514  * addr         : will be filled with start address of the segment
515  * end          : will be filled with end address of the segment
516  * return values:
517  * -ENOSYS  : we are not running on VM
518  * -EIO     : could not perform query or load diagnose
519  * -ENOENT  : no such segment
520  * -EOPNOTSUPP: multi-part segment cannot be used with linux
521  * -ENOSPC  : segment cannot be used (overlaps with storage)
522  * -EBUSY   : segment can temporarily not be used (overlaps with dcss)
523  * -ERANGE  : segment cannot be used (exceeds kernel mapping range)
524  * -EPERM   : segment is currently loaded with incompatible permissions
525  * -ENOMEM  : out of memory
526  * 0 .. 6   : type of segment as defined in include/asm-s390/extmem.h
527  */
528 int
529 segment_load (char *name, int do_nonshared, unsigned long *addr,
530                 unsigned long *end)
531 {
532         struct dcss_segment *seg;
533         int rc;
534 
535         if (!MACHINE_IS_VM)
536                 return -ENOSYS;
537 
538         mutex_lock(&dcss_lock);
539         seg = segment_by_name (name);
540         if (seg == NULL)
541                 rc = __segment_load (name, do_nonshared, addr, end);
542         else {
543                 if (do_nonshared == seg->do_nonshared) {
544                         atomic_inc(&seg->ref_count);
545                         *addr = seg->start_addr;
546                         *end  = seg->end;
547                         rc    = seg->vm_segtype;
548                 } else {
549                         *addr = *end = 0;
550                         rc    = -EPERM;
551                 }
552         }
553         mutex_unlock(&dcss_lock);
554         return rc;
555 }
556 
557 /*
558  * this function modifies the shared state of a DCSS segment. note that
559  * name         : name of the DCSS
560  * do_nonshared : 0 indicates that the dcss should be shared with other linux images
561  *                1 indicates that the dcss should be exclusive for this linux image
562  * return values:
563  * -EIO     : could not perform load diagnose (segment gone!)
564  * -ENOENT  : no such segment (segment gone!)
565  * -EAGAIN  : segment is in use by other exploiters, try later
566  * -EINVAL  : no segment with the given name is currently loaded - name invalid
567  * -EBUSY   : segment can temporarily not be used (overlaps with dcss)
568  * 0        : operation succeeded
569  */
570 int
571 segment_modify_shared (char *name, int do_nonshared)
572 {
573         struct dcss_segment *seg;
574         unsigned long start_addr, end_addr, dummy;
575         int rc, diag_cc;
576 
577         start_addr = end_addr = 0;
578         mutex_lock(&dcss_lock);
579         seg = segment_by_name (name);
580         if (seg == NULL) {
581                 rc = -EINVAL;
582                 goto out_unlock;
583         }
584         if (do_nonshared == seg->do_nonshared) {
585                 pr_info("DCSS %s is already in the requested access "
586                         "mode\n", name);
587                 rc = 0;
588                 goto out_unlock;
589         }
590         if (atomic_read (&seg->ref_count) != 1) {
591                 pr_warning("DCSS %s is in use and cannot be reloaded\n",
592                            name);
593                 rc = -EAGAIN;
594                 goto out_unlock;
595         }
596         release_resource(seg->res);
597         if (do_nonshared)
598                 seg->res->flags &= ~IORESOURCE_READONLY;
599         else
600                 if (seg->vm_segtype == SEG_TYPE_SR ||
601                     seg->vm_segtype == SEG_TYPE_ER)
602                         seg->res->flags |= IORESOURCE_READONLY;
603 
604         if (request_resource(&iomem_resource, seg->res)) {
605                 pr_warning("DCSS %s overlaps with used memory resources "
606                            "and cannot be reloaded\n", name);
607                 rc = -EBUSY;
608                 kfree(seg->res);
609                 goto out_del_mem;
610         }
611 
612         dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
613         if (do_nonshared)
614                 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
615                                 &start_addr, &end_addr);
616         else
617                 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
618                                 &start_addr, &end_addr);
619         if (diag_cc < 0) {
620                 rc = diag_cc;
621                 goto out_del_res;
622         }
623         if (diag_cc > 1) {
624                 pr_warning("Reloading DCSS %s failed with rc=%ld\n", name,
625                            end_addr);
626                 rc = dcss_diag_translate_rc(end_addr);
627                 goto out_del_res;
628         }
629         seg->start_addr = start_addr;
630         seg->end = end_addr;
631         seg->do_nonshared = do_nonshared;
632         rc = 0;
633         goto out_unlock;
634  out_del_res:
635         release_resource(seg->res);
636         kfree(seg->res);
637  out_del_mem:
638         vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
639         list_del(&seg->list);
640         dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
641         kfree(seg);
642  out_unlock:
643         mutex_unlock(&dcss_lock);
644         return rc;
645 }
646 
647 /*
648  * Decrease the use count of a DCSS segment and remove
649  * it from the address space if nobody is using it
650  * any longer.
651  */
652 void
653 segment_unload(char *name)
654 {
655         unsigned long dummy;
656         struct dcss_segment *seg;
657 
658         if (!MACHINE_IS_VM)
659                 return;
660 
661         mutex_lock(&dcss_lock);
662         seg = segment_by_name (name);
663         if (seg == NULL) {
664                 pr_err("Unloading unknown DCSS %s failed\n", name);
665                 goto out_unlock;
666         }
667         if (atomic_dec_return(&seg->ref_count) != 0)
668                 goto out_unlock;
669         release_resource(seg->res);
670         kfree(seg->res);
671         vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
672         list_del(&seg->list);
673         dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
674         kfree(seg);
675 out_unlock:
676         mutex_unlock(&dcss_lock);
677 }
678 
679 /*
680  * save segment content permanently
681  */
682 void
683 segment_save(char *name)
684 {
685         struct dcss_segment *seg;
686         char cmd1[160];
687         char cmd2[80];
688         int i, response;
689 
690         if (!MACHINE_IS_VM)
691                 return;
692 
693         mutex_lock(&dcss_lock);
694         seg = segment_by_name (name);
695 
696         if (seg == NULL) {
697                 pr_err("Saving unknown DCSS %s failed\n", name);
698                 goto out;
699         }
700 
701         sprintf(cmd1, "DEFSEG %s", name);
702         for (i=0; i<seg->segcnt; i++) {
703                 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
704                         seg->range[i].start >> PAGE_SHIFT,
705                         seg->range[i].end >> PAGE_SHIFT,
706                         segtype_string[seg->range[i].start & 0xff]);
707         }
708         sprintf(cmd2, "SAVESEG %s", name);
709         response = 0;
710         cpcmd(cmd1, NULL, 0, &response);
711         if (response) {
712                 pr_err("Saving a DCSS failed with DEFSEG response code "
713                        "%i\n", response);
714                 goto out;
715         }
716         cpcmd(cmd2, NULL, 0, &response);
717         if (response) {
718                 pr_err("Saving a DCSS failed with SAVESEG response code "
719                        "%i\n", response);
720                 goto out;
721         }
722 out:
723         mutex_unlock(&dcss_lock);
724 }
725 
726 /*
727  * print appropriate error message for segment_load()/segment_type()
728  * return code
729  */
730 void segment_warning(int rc, char *seg_name)
731 {
732         switch (rc) {
733         case -ENOENT:
734                 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
735                 break;
736         case -ENOSYS:
737                 pr_err("DCSS %s cannot be loaded or queried without "
738                        "z/VM\n", seg_name);
739                 break;
740         case -EIO:
741                 pr_err("Loading or querying DCSS %s resulted in a "
742                        "hardware error\n", seg_name);
743                 break;
744         case -EOPNOTSUPP:
745                 pr_err("DCSS %s has multiple page ranges and cannot be "
746                        "loaded or queried\n", seg_name);
747                 break;
748         case -ENOSPC:
749                 pr_err("DCSS %s overlaps with used storage and cannot "
750                        "be loaded\n", seg_name);
751                 break;
752         case -EBUSY:
753                 pr_err("%s needs used memory resources and cannot be "
754                        "loaded or queried\n", seg_name);
755                 break;
756         case -EPERM:
757                 pr_err("DCSS %s is already loaded in a different access "
758                        "mode\n", seg_name);
759                 break;
760         case -ENOMEM:
761                 pr_err("There is not enough memory to load or query "
762                        "DCSS %s\n", seg_name);
763                 break;
764         case -ERANGE:
765                 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
766                        "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
767                 break;
768         default:
769                 break;
770         }
771 }
772 
773 EXPORT_SYMBOL(segment_load);
774 EXPORT_SYMBOL(segment_unload);
775 EXPORT_SYMBOL(segment_save);
776 EXPORT_SYMBOL(segment_type);
777 EXPORT_SYMBOL(segment_modify_shared);
778 EXPORT_SYMBOL(segment_warning);
779 

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