~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-4.17-rc6 ] ~ [ linux-4.16.10 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.42 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.101 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.132 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.51 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.109 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.56 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.101 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  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  * Copyright IBM Corp. 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/export.h>
 19 #include <linux/bootmem.h>
 20 #include <linux/ctype.h>
 21 #include <linux/ioport.h>
 22 #include <asm/diag.h>
 23 #include <asm/page.h>
 24 #include <asm/pgtable.h>
 25 #include <asm/ebcdic.h>
 26 #include <asm/errno.h>
 27 #include <asm/extmem.h>
 28 #include <asm/cpcmd.h>
 29 #include <asm/setup.h>
 30 
 31 #define DCSS_LOADSHR    0x00
 32 #define DCSS_LOADNSR    0x04
 33 #define DCSS_PURGESEG   0x08
 34 #define DCSS_FINDSEG    0x0c
 35 #define DCSS_LOADNOLY   0x10
 36 #define DCSS_SEGEXT     0x18
 37 #define DCSS_LOADSHRX   0x20
 38 #define DCSS_LOADNSRX   0x24
 39 #define DCSS_FINDSEGX   0x2c
 40 #define DCSS_SEGEXTX    0x38
 41 #define DCSS_FINDSEGA   0x0c
 42 
 43 struct qrange {
 44         unsigned long  start; /* last byte type */
 45         unsigned long  end;   /* last byte reserved */
 46 };
 47 
 48 struct qout64 {
 49         unsigned long segstart;
 50         unsigned long segend;
 51         int segcnt;
 52         int segrcnt;
 53         struct qrange range[6];
 54 };
 55 
 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 
 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;
 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         char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA);
107         unsigned long rx, ry;
108         int rc;
109 
110         if (name == NULL)
111                 return -ENOMEM;
112 
113         rx = (unsigned long) name;
114         ry = DCSS_FINDSEGX;
115 
116         strcpy(name, "dummy");
117         diag_stat_inc(DIAG_STAT_X064);
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", "memory");
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                 segext_scode = DCSS_SEGEXTX;
135                 return 0;
136         }
137         /* Diag x'64' new subcodes are not supported, set to old subcodes */
138         loadshr_scode = DCSS_LOADNOLY;
139         loadnsr_scode = DCSS_LOADNSR;
140         purgeseg_scode = DCSS_PURGESEG;
141         segext_scode = DCSS_SEGEXT;
142         return 0;
143 }
144 
145 /*
146  * Create the 8 bytes, ebcdic VM segment name from
147  * an ascii name.
148  */
149 static void
150 dcss_mkname(char *name, char *dcss_name)
151 {
152         int i;
153 
154         for (i = 0; i < 8; i++) {
155                 if (name[i] == '\0')
156                         break;
157                 dcss_name[i] = toupper(name[i]);
158         }
159         for (; i < 8; i++)
160                 dcss_name[i] = ' ';
161         ASCEBC(dcss_name, 8);
162 }
163 
164 
165 /*
166  * search all segments in dcss_list, and return the one
167  * namend *name. If not found, return NULL.
168  */
169 static struct dcss_segment *
170 segment_by_name (char *name)
171 {
172         char dcss_name[9];
173         struct list_head *l;
174         struct dcss_segment *tmp, *retval = NULL;
175 
176         BUG_ON(!mutex_is_locked(&dcss_lock));
177         dcss_mkname (name, dcss_name);
178         list_for_each (l, &dcss_list) {
179                 tmp = list_entry (l, struct dcss_segment, list);
180                 if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
181                         retval = tmp;
182                         break;
183                 }
184         }
185         return retval;
186 }
187 
188 
189 /*
190  * Perform a function on a dcss segment.
191  */
192 static inline int
193 dcss_diag(int *func, void *parameter,
194            unsigned long *ret1, unsigned long *ret2)
195 {
196         unsigned long rx, ry;
197         int rc;
198 
199         if (scode_set == 0) {
200                 rc = dcss_set_subcodes();
201                 if (rc < 0)
202                         return rc;
203                 scode_set = 1;
204         }
205         rx = (unsigned long) parameter;
206         ry = (unsigned long) *func;
207 
208         /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
209         diag_stat_inc(DIAG_STAT_X064);
210         if (*func > DCSS_SEGEXT)
211                 asm volatile(
212                         "       diag    %0,%1,0x64\n"
213                         "       ipm     %2\n"
214                         "       srl     %2,28\n"
215                         : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
216         /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
217         else
218                 asm volatile(
219                         "       sam31\n"
220                         "       diag    %0,%1,0x64\n"
221                         "       sam64\n"
222                         "       ipm     %2\n"
223                         "       srl     %2,28\n"
224                         : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
225         *ret1 = rx;
226         *ret2 = ry;
227         return rc;
228 }
229 
230 static inline int
231 dcss_diag_translate_rc (int vm_rc) {
232         if (vm_rc == 44)
233                 return -ENOENT;
234         return -EIO;
235 }
236 
237 
238 /* do a diag to get info about a segment.
239  * fills start_address, end and vm_segtype fields
240  */
241 static int
242 query_segment_type (struct dcss_segment *seg)
243 {
244         unsigned long dummy, vmrc;
245         int diag_cc, rc, i;
246         struct qout64 *qout;
247         struct qin64 *qin;
248 
249         qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
250         qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
251         if ((qin == NULL) || (qout == NULL)) {
252                 rc = -ENOMEM;
253                 goto out_free;
254         }
255 
256         /* initialize diag input parameters */
257         qin->qopcode = DCSS_FINDSEGA;
258         qin->qoutptr = (unsigned long) qout;
259         qin->qoutlen = sizeof(struct qout64);
260         memcpy (qin->qname, seg->dcss_name, 8);
261 
262         diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
263 
264         if (diag_cc < 0) {
265                 rc = diag_cc;
266                 goto out_free;
267         }
268         if (diag_cc > 1) {
269                 pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc);
270                 rc = dcss_diag_translate_rc (vmrc);
271                 goto out_free;
272         }
273 
274         /* Only old format of output area of Diagnose x'64' is supported,
275            copy data for the new format. */
276         if (segext_scode == DCSS_SEGEXT) {
277                 struct qout64_old *qout_old;
278                 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
279                 if (qout_old == NULL) {
280                         rc = -ENOMEM;
281                         goto out_free;
282                 }
283                 memcpy(qout_old, qout, sizeof(struct qout64_old));
284                 qout->segstart = (unsigned long) qout_old->segstart;
285                 qout->segend = (unsigned long) qout_old->segend;
286                 qout->segcnt = qout_old->segcnt;
287                 qout->segrcnt = qout_old->segrcnt;
288 
289                 if (qout->segcnt > 6)
290                         qout->segrcnt = 6;
291                 for (i = 0; i < qout->segrcnt; i++) {
292                         qout->range[i].start =
293                                 (unsigned long) qout_old->range[i].start;
294                         qout->range[i].end =
295                                 (unsigned long) qout_old->range[i].end;
296                 }
297                 kfree(qout_old);
298         }
299         if (qout->segcnt > 6) {
300                 rc = -EOPNOTSUPP;
301                 goto out_free;
302         }
303 
304         if (qout->segcnt == 1) {
305                 seg->vm_segtype = qout->range[0].start & 0xff;
306         } else {
307                 /* multi-part segment. only one type supported here:
308                     - all parts are contiguous
309                     - all parts are either EW or EN type
310                     - maximum 6 parts allowed */
311                 unsigned long start = qout->segstart >> PAGE_SHIFT;
312                 for (i=0; i<qout->segcnt; i++) {
313                         if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
314                             ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
315                                 rc = -EOPNOTSUPP;
316                                 goto out_free;
317                         }
318                         if (start != qout->range[i].start >> PAGE_SHIFT) {
319                                 rc = -EOPNOTSUPP;
320                                 goto out_free;
321                         }
322                         start = (qout->range[i].end >> PAGE_SHIFT) + 1;
323                 }
324                 seg->vm_segtype = SEG_TYPE_EWEN;
325         }
326 
327         /* analyze diag output and update seg */
328         seg->start_addr = qout->segstart;
329         seg->end = qout->segend;
330 
331         memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
332         seg->segcnt = qout->segcnt;
333 
334         rc = 0;
335 
336  out_free:
337         kfree(qin);
338         kfree(qout);
339         return rc;
340 }
341 
342 /*
343  * get info about a segment
344  * possible return values:
345  * -ENOSYS  : we are not running on VM
346  * -EIO     : could not perform query diagnose
347  * -ENOENT  : no such segment
348  * -EOPNOTSUPP: multi-part segment cannot be used with linux
349  * -ENOMEM  : out of memory
350  * 0 .. 6   : type of segment as defined in include/asm-s390/extmem.h
351  */
352 int
353 segment_type (char* name)
354 {
355         int rc;
356         struct dcss_segment seg;
357 
358         if (!MACHINE_IS_VM)
359                 return -ENOSYS;
360 
361         dcss_mkname(name, seg.dcss_name);
362         rc = query_segment_type (&seg);
363         if (rc < 0)
364                 return rc;
365         return seg.vm_segtype;
366 }
367 
368 /*
369  * check if segment collides with other segments that are currently loaded
370  * returns 1 if this is the case, 0 if no collision was found
371  */
372 static int
373 segment_overlaps_others (struct dcss_segment *seg)
374 {
375         struct list_head *l;
376         struct dcss_segment *tmp;
377 
378         BUG_ON(!mutex_is_locked(&dcss_lock));
379         list_for_each(l, &dcss_list) {
380                 tmp = list_entry(l, struct dcss_segment, list);
381                 if ((tmp->start_addr >> 20) > (seg->end >> 20))
382                         continue;
383                 if ((tmp->end >> 20) < (seg->start_addr >> 20))
384                         continue;
385                 if (seg == tmp)
386                         continue;
387                 return 1;
388         }
389         return 0;
390 }
391 
392 /*
393  * real segment loading function, called from segment_load
394  */
395 static int
396 __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
397 {
398         unsigned long start_addr, end_addr, dummy;
399         struct dcss_segment *seg;
400         int rc, diag_cc;
401 
402         start_addr = end_addr = 0;
403         seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
404         if (seg == NULL) {
405                 rc = -ENOMEM;
406                 goto out;
407         }
408         dcss_mkname (name, seg->dcss_name);
409         rc = query_segment_type (seg);
410         if (rc < 0)
411                 goto out_free;
412 
413         if (loadshr_scode == DCSS_LOADSHRX) {
414                 if (segment_overlaps_others(seg)) {
415                         rc = -EBUSY;
416                         goto out_free;
417                 }
418         }
419 
420         rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
421 
422         if (rc)
423                 goto out_free;
424 
425         seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
426         if (seg->res == NULL) {
427                 rc = -ENOMEM;
428                 goto out_shared;
429         }
430         seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
431         seg->res->start = seg->start_addr;
432         seg->res->end = seg->end;
433         memcpy(&seg->res_name, seg->dcss_name, 8);
434         EBCASC(seg->res_name, 8);
435         seg->res_name[8] = '\0';
436         strncat(seg->res_name, " (DCSS)", 7);
437         seg->res->name = seg->res_name;
438         rc = seg->vm_segtype;
439         if (rc == SEG_TYPE_SC ||
440             ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
441                 seg->res->flags |= IORESOURCE_READONLY;
442         if (request_resource(&iomem_resource, seg->res)) {
443                 rc = -EBUSY;
444                 kfree(seg->res);
445                 goto out_shared;
446         }
447 
448         if (do_nonshared)
449                 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
450                                 &start_addr, &end_addr);
451         else
452                 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
453                                 &start_addr, &end_addr);
454         if (diag_cc < 0) {
455                 dcss_diag(&purgeseg_scode, seg->dcss_name,
456                                 &dummy, &dummy);
457                 rc = diag_cc;
458                 goto out_resource;
459         }
460         if (diag_cc > 1) {
461                 pr_warn("Loading DCSS %s failed with rc=%ld\n", name, end_addr);
462                 rc = dcss_diag_translate_rc(end_addr);
463                 dcss_diag(&purgeseg_scode, seg->dcss_name,
464                                 &dummy, &dummy);
465                 goto out_resource;
466         }
467         seg->start_addr = start_addr;
468         seg->end = end_addr;
469         seg->do_nonshared = do_nonshared;
470         atomic_set(&seg->ref_count, 1);
471         list_add(&seg->list, &dcss_list);
472         *addr = seg->start_addr;
473         *end  = seg->end;
474         if (do_nonshared)
475                 pr_info("DCSS %s of range %p to %p and type %s loaded as "
476                         "exclusive-writable\n", name, (void*) seg->start_addr,
477                         (void*) seg->end, segtype_string[seg->vm_segtype]);
478         else {
479                 pr_info("DCSS %s of range %p to %p and type %s loaded in "
480                         "shared access mode\n", name, (void*) seg->start_addr,
481                         (void*) seg->end, segtype_string[seg->vm_segtype]);
482         }
483         goto out;
484  out_resource:
485         release_resource(seg->res);
486         kfree(seg->res);
487  out_shared:
488         vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
489  out_free:
490         kfree(seg);
491  out:
492         return rc;
493 }
494 
495 /*
496  * this function loads a DCSS segment
497  * name         : name of the DCSS
498  * do_nonshared : 0 indicates that the dcss should be shared with other linux images
499  *                1 indicates that the dcss should be exclusive for this linux image
500  * addr         : will be filled with start address of the segment
501  * end          : will be filled with end address of the segment
502  * return values:
503  * -ENOSYS  : we are not running on VM
504  * -EIO     : could not perform query or load diagnose
505  * -ENOENT  : no such segment
506  * -EOPNOTSUPP: multi-part segment cannot be used with linux
507  * -ENOSPC  : segment cannot be used (overlaps with storage)
508  * -EBUSY   : segment can temporarily not be used (overlaps with dcss)
509  * -ERANGE  : segment cannot be used (exceeds kernel mapping range)
510  * -EPERM   : segment is currently loaded with incompatible permissions
511  * -ENOMEM  : out of memory
512  * 0 .. 6   : type of segment as defined in include/asm-s390/extmem.h
513  */
514 int
515 segment_load (char *name, int do_nonshared, unsigned long *addr,
516                 unsigned long *end)
517 {
518         struct dcss_segment *seg;
519         int rc;
520 
521         if (!MACHINE_IS_VM)
522                 return -ENOSYS;
523 
524         mutex_lock(&dcss_lock);
525         seg = segment_by_name (name);
526         if (seg == NULL)
527                 rc = __segment_load (name, do_nonshared, addr, end);
528         else {
529                 if (do_nonshared == seg->do_nonshared) {
530                         atomic_inc(&seg->ref_count);
531                         *addr = seg->start_addr;
532                         *end  = seg->end;
533                         rc    = seg->vm_segtype;
534                 } else {
535                         *addr = *end = 0;
536                         rc    = -EPERM;
537                 }
538         }
539         mutex_unlock(&dcss_lock);
540         return rc;
541 }
542 
543 /*
544  * this function modifies the shared state of a DCSS segment. note that
545  * name         : name of the DCSS
546  * do_nonshared : 0 indicates that the dcss should be shared with other linux images
547  *                1 indicates that the dcss should be exclusive for this linux image
548  * return values:
549  * -EIO     : could not perform load diagnose (segment gone!)
550  * -ENOENT  : no such segment (segment gone!)
551  * -EAGAIN  : segment is in use by other exploiters, try later
552  * -EINVAL  : no segment with the given name is currently loaded - name invalid
553  * -EBUSY   : segment can temporarily not be used (overlaps with dcss)
554  * 0        : operation succeeded
555  */
556 int
557 segment_modify_shared (char *name, int do_nonshared)
558 {
559         struct dcss_segment *seg;
560         unsigned long start_addr, end_addr, dummy;
561         int rc, diag_cc;
562 
563         start_addr = end_addr = 0;
564         mutex_lock(&dcss_lock);
565         seg = segment_by_name (name);
566         if (seg == NULL) {
567                 rc = -EINVAL;
568                 goto out_unlock;
569         }
570         if (do_nonshared == seg->do_nonshared) {
571                 pr_info("DCSS %s is already in the requested access "
572                         "mode\n", name);
573                 rc = 0;
574                 goto out_unlock;
575         }
576         if (atomic_read (&seg->ref_count) != 1) {
577                 pr_warn("DCSS %s is in use and cannot be reloaded\n", 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_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n",
591                         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_warn("Reloading DCSS %s failed with rc=%ld\n",
610                         name, 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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp