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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 #ifdef CONFIG_64BIT
 55 struct 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' */
 61 struct qout64_old {
 62         int segstart;
 63         int segend;
 64         int segcnt;
 65         int segrcnt;
 66         struct qrange_old range[6];
 67 };
 68 #endif
 69 
 70 struct 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 
 80 struct 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 
 94 static DEFINE_MUTEX(dcss_lock);
 95 static LIST_HEAD(dcss_list);
 96 static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
 97                                         "EW/EN-MIXED" };
 98 static int loadshr_scode, loadnsr_scode, findseg_scode;
 99 static int segext_scode, purgeseg_scode;
100 static int scode_set;
101 
102 /* set correct Diag x'64' subcodes. */
103 static int
104 dcss_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  */
152 static void
153 dcss_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  */
172 static struct dcss_segment *
173 segment_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  */
195 static inline int
196 dcss_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 
240 static inline int
241 dcss_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  */
251 static int
252 query_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  */
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         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  */
527 int
528 segment_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  */
569 int
570 segment_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  */
651 void
652 segment_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);
674 out_unlock:
675         mutex_unlock(&dcss_lock);
676 }
677 
678 /*
679  * save segment content permanently
680  */
681 void
682 segment_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         }
721 out:
722         mutex_unlock(&dcss_lock);
723 }
724 
725 /*
726  * print appropriate error message for segment_load()/segment_type()
727  * return code
728  */
729 void 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 
772 EXPORT_SYMBOL(segment_load);
773 EXPORT_SYMBOL(segment_unload);
774 EXPORT_SYMBOL(segment_save);
775 EXPORT_SYMBOL(segment_type);
776 EXPORT_SYMBOL(segment_modify_shared);
777 EXPORT_SYMBOL(segment_warning);
778 

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