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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/memblock.h>
20#include <linux/ctype.h>
21#include <linux/ioport.h>
22#include <linux/refcount.h>
23#include <linux/pgtable.h>
24#include <asm/diag.h>
25#include <asm/page.h>
26#include <asm/ebcdic.h>
27#include <asm/errno.h>
28#include <asm/extmem.h>
29#include <asm/cpcmd.h>
30#include <asm/setup.h>
31
32#define DCSS_PURGESEG 0x08
33#define DCSS_LOADSHRX 0x20
34#define DCSS_LOADNSRX 0x24
35#define DCSS_FINDSEGX 0x2c
36#define DCSS_SEGEXTX 0x38
37#define DCSS_FINDSEGA 0x0c
38
39struct qrange {
40 unsigned long start; /* last byte type */
41 unsigned long end; /* last byte reserved */
42};
43
44struct qout64 {
45 unsigned long segstart;
46 unsigned long segend;
47 int segcnt;
48 int segrcnt;
49 struct qrange range[6];
50};
51
52struct qin64 {
53 char qopcode;
54 char rsrv1[3];
55 char qrcode;
56 char rsrv2[3];
57 char qname[8];
58 unsigned int qoutptr;
59 short int qoutlen;
60};
61
62struct dcss_segment {
63 struct list_head list;
64 char dcss_name[8];
65 char res_name[16];
66 unsigned long start_addr;
67 unsigned long end;
68 refcount_t ref_count;
69 int do_nonshared;
70 unsigned int vm_segtype;
71 struct qrange range[6];
72 int segcnt;
73 struct resource *res;
74};
75
76static DEFINE_MUTEX(dcss_lock);
77static LIST_HEAD(dcss_list);
78static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
79 "EW/EN-MIXED" };
80static int loadshr_scode = DCSS_LOADSHRX;
81static int loadnsr_scode = DCSS_LOADNSRX;
82static int purgeseg_scode = DCSS_PURGESEG;
83static int segext_scode = DCSS_SEGEXTX;
84
85/*
86 * Create the 8 bytes, ebcdic VM segment name from
87 * an ascii name.
88 */
89static void
90dcss_mkname(char *name, char *dcss_name)
91{
92 int i;
93
94 for (i = 0; i < 8; i++) {
95 if (name[i] == '\0')
96 break;
97 dcss_name[i] = toupper(name[i]);
98 }
99 for (; i < 8; i++)
100 dcss_name[i] = ' ';
101 ASCEBC(dcss_name, 8);
102}
103
104
105/*
106 * search all segments in dcss_list, and return the one
107 * namend *name. If not found, return NULL.
108 */
109static struct dcss_segment *
110segment_by_name (char *name)
111{
112 char dcss_name[9];
113 struct list_head *l;
114 struct dcss_segment *tmp, *retval = NULL;
115
116 BUG_ON(!mutex_is_locked(&dcss_lock));
117 dcss_mkname (name, dcss_name);
118 list_for_each (l, &dcss_list) {
119 tmp = list_entry (l, struct dcss_segment, list);
120 if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
121 retval = tmp;
122 break;
123 }
124 }
125 return retval;
126}
127
128
129/*
130 * Perform a function on a dcss segment.
131 */
132static inline int
133dcss_diag(int *func, void *parameter,
134 unsigned long *ret1, unsigned long *ret2)
135{
136 unsigned long rx, ry;
137 int rc;
138
139 rx = (unsigned long) parameter;
140 ry = (unsigned long) *func;
141
142 diag_stat_inc(DIAG_STAT_X064);
143 asm volatile(
144 " diag %0,%1,0x64\n"
145 " ipm %2\n"
146 " srl %2,28\n"
147 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
148 *ret1 = rx;
149 *ret2 = ry;
150 return rc;
151}
152
153static inline int
154dcss_diag_translate_rc (int vm_rc) {
155 if (vm_rc == 44)
156 return -ENOENT;
157 return -EIO;
158}
159
160
161/* do a diag to get info about a segment.
162 * fills start_address, end and vm_segtype fields
163 */
164static int
165query_segment_type (struct dcss_segment *seg)
166{
167 unsigned long dummy, vmrc;
168 int diag_cc, rc, i;
169 struct qout64 *qout;
170 struct qin64 *qin;
171
172 qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
173 qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
174 if ((qin == NULL) || (qout == NULL)) {
175 rc = -ENOMEM;
176 goto out_free;
177 }
178
179 /* initialize diag input parameters */
180 qin->qopcode = DCSS_FINDSEGA;
181 qin->qoutptr = (unsigned long) qout;
182 qin->qoutlen = sizeof(struct qout64);
183 memcpy (qin->qname, seg->dcss_name, 8);
184
185 diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
186
187 if (diag_cc < 0) {
188 rc = diag_cc;
189 goto out_free;
190 }
191 if (diag_cc > 1) {
192 pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc);
193 rc = dcss_diag_translate_rc (vmrc);
194 goto out_free;
195 }
196
197 if (qout->segcnt > 6) {
198 rc = -EOPNOTSUPP;
199 goto out_free;
200 }
201
202 if (qout->segcnt == 1) {
203 seg->vm_segtype = qout->range[0].start & 0xff;
204 } else {
205 /* multi-part segment. only one type supported here:
206 - all parts are contiguous
207 - all parts are either EW or EN type
208 - maximum 6 parts allowed */
209 unsigned long start = qout->segstart >> PAGE_SHIFT;
210 for (i=0; i<qout->segcnt; i++) {
211 if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
212 ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
213 rc = -EOPNOTSUPP;
214 goto out_free;
215 }
216 if (start != qout->range[i].start >> PAGE_SHIFT) {
217 rc = -EOPNOTSUPP;
218 goto out_free;
219 }
220 start = (qout->range[i].end >> PAGE_SHIFT) + 1;
221 }
222 seg->vm_segtype = SEG_TYPE_EWEN;
223 }
224
225 /* analyze diag output and update seg */
226 seg->start_addr = qout->segstart;
227 seg->end = qout->segend;
228
229 memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
230 seg->segcnt = qout->segcnt;
231
232 rc = 0;
233
234 out_free:
235 kfree(qin);
236 kfree(qout);
237 return rc;
238}
239
240/*
241 * get info about a segment
242 * possible return values:
243 * -ENOSYS : we are not running on VM
244 * -EIO : could not perform query diagnose
245 * -ENOENT : no such segment
246 * -EOPNOTSUPP: multi-part segment cannot be used with linux
247 * -ENOMEM : out of memory
248 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
249 */
250int
251segment_type (char* name)
252{
253 int rc;
254 struct dcss_segment seg;
255
256 if (!MACHINE_IS_VM)
257 return -ENOSYS;
258
259 dcss_mkname(name, seg.dcss_name);
260 rc = query_segment_type (&seg);
261 if (rc < 0)
262 return rc;
263 return seg.vm_segtype;
264}
265
266/*
267 * check if segment collides with other segments that are currently loaded
268 * returns 1 if this is the case, 0 if no collision was found
269 */
270static int
271segment_overlaps_others (struct dcss_segment *seg)
272{
273 struct list_head *l;
274 struct dcss_segment *tmp;
275
276 BUG_ON(!mutex_is_locked(&dcss_lock));
277 list_for_each(l, &dcss_list) {
278 tmp = list_entry(l, struct dcss_segment, list);
279 if ((tmp->start_addr >> 20) > (seg->end >> 20))
280 continue;
281 if ((tmp->end >> 20) < (seg->start_addr >> 20))
282 continue;
283 if (seg == tmp)
284 continue;
285 return 1;
286 }
287 return 0;
288}
289
290/*
291 * real segment loading function, called from segment_load
292 */
293static int
294__segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
295{
296 unsigned long start_addr, end_addr, dummy;
297 struct dcss_segment *seg;
298 int rc, diag_cc;
299
300 start_addr = end_addr = 0;
301 seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
302 if (seg == NULL) {
303 rc = -ENOMEM;
304 goto out;
305 }
306 dcss_mkname (name, seg->dcss_name);
307 rc = query_segment_type (seg);
308 if (rc < 0)
309 goto out_free;
310
311 if (segment_overlaps_others(seg)) {
312 rc = -EBUSY;
313 goto out_free;
314 }
315
316 seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
317 if (seg->res == NULL) {
318 rc = -ENOMEM;
319 goto out_free;
320 }
321 seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
322 seg->res->start = seg->start_addr;
323 seg->res->end = seg->end;
324 memcpy(&seg->res_name, seg->dcss_name, 8);
325 EBCASC(seg->res_name, 8);
326 seg->res_name[8] = '\0';
327 strlcat(seg->res_name, " (DCSS)", sizeof(seg->res_name));
328 seg->res->name = seg->res_name;
329 rc = seg->vm_segtype;
330 if (rc == SEG_TYPE_SC ||
331 ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
332 seg->res->flags |= IORESOURCE_READONLY;
333
334 /* Check for overlapping resources before adding the mapping. */
335 if (request_resource(&iomem_resource, seg->res)) {
336 rc = -EBUSY;
337 goto out_free_resource;
338 }
339
340 rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
341 if (rc)
342 goto out_resource;
343
344 if (do_nonshared)
345 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
346 &start_addr, &end_addr);
347 else
348 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
349 &start_addr, &end_addr);
350 if (diag_cc < 0) {
351 dcss_diag(&purgeseg_scode, seg->dcss_name,
352 &dummy, &dummy);
353 rc = diag_cc;
354 goto out_mapping;
355 }
356 if (diag_cc > 1) {
357 pr_warn("Loading DCSS %s failed with rc=%ld\n", name, end_addr);
358 rc = dcss_diag_translate_rc(end_addr);
359 dcss_diag(&purgeseg_scode, seg->dcss_name,
360 &dummy, &dummy);
361 goto out_mapping;
362 }
363 seg->start_addr = start_addr;
364 seg->end = end_addr;
365 seg->do_nonshared = do_nonshared;
366 refcount_set(&seg->ref_count, 1);
367 list_add(&seg->list, &dcss_list);
368 *addr = seg->start_addr;
369 *end = seg->end;
370 if (do_nonshared)
371 pr_info("DCSS %s of range %px to %px and type %s loaded as "
372 "exclusive-writable\n", name, (void*) seg->start_addr,
373 (void*) seg->end, segtype_string[seg->vm_segtype]);
374 else {
375 pr_info("DCSS %s of range %px to %px and type %s loaded in "
376 "shared access mode\n", name, (void*) seg->start_addr,
377 (void*) seg->end, segtype_string[seg->vm_segtype]);
378 }
379 goto out;
380 out_mapping:
381 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
382 out_resource:
383 release_resource(seg->res);
384 out_free_resource:
385 kfree(seg->res);
386 out_free:
387 kfree(seg);
388 out:
389 return rc;
390}
391
392/*
393 * this function loads a DCSS segment
394 * name : name of the DCSS
395 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
396 * 1 indicates that the dcss should be exclusive for this linux image
397 * addr : will be filled with start address of the segment
398 * end : will be filled with end address of the segment
399 * return values:
400 * -ENOSYS : we are not running on VM
401 * -EIO : could not perform query or load diagnose
402 * -ENOENT : no such segment
403 * -EOPNOTSUPP: multi-part segment cannot be used with linux
404 * -EBUSY : segment cannot be used (overlaps with dcss or storage)
405 * -ERANGE : segment cannot be used (exceeds kernel mapping range)
406 * -EPERM : segment is currently loaded with incompatible permissions
407 * -ENOMEM : out of memory
408 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
409 */
410int
411segment_load (char *name, int do_nonshared, unsigned long *addr,
412 unsigned long *end)
413{
414 struct dcss_segment *seg;
415 int rc;
416
417 if (!MACHINE_IS_VM)
418 return -ENOSYS;
419
420 mutex_lock(&dcss_lock);
421 seg = segment_by_name (name);
422 if (seg == NULL)
423 rc = __segment_load (name, do_nonshared, addr, end);
424 else {
425 if (do_nonshared == seg->do_nonshared) {
426 refcount_inc(&seg->ref_count);
427 *addr = seg->start_addr;
428 *end = seg->end;
429 rc = seg->vm_segtype;
430 } else {
431 *addr = *end = 0;
432 rc = -EPERM;
433 }
434 }
435 mutex_unlock(&dcss_lock);
436 return rc;
437}
438
439/*
440 * this function modifies the shared state of a DCSS segment. note that
441 * name : name of the DCSS
442 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
443 * 1 indicates that the dcss should be exclusive for this linux image
444 * return values:
445 * -EIO : could not perform load diagnose (segment gone!)
446 * -ENOENT : no such segment (segment gone!)
447 * -EAGAIN : segment is in use by other exploiters, try later
448 * -EINVAL : no segment with the given name is currently loaded - name invalid
449 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
450 * 0 : operation succeeded
451 */
452int
453segment_modify_shared (char *name, int do_nonshared)
454{
455 struct dcss_segment *seg;
456 unsigned long start_addr, end_addr, dummy;
457 int rc, diag_cc;
458
459 start_addr = end_addr = 0;
460 mutex_lock(&dcss_lock);
461 seg = segment_by_name (name);
462 if (seg == NULL) {
463 rc = -EINVAL;
464 goto out_unlock;
465 }
466 if (do_nonshared == seg->do_nonshared) {
467 pr_info("DCSS %s is already in the requested access "
468 "mode\n", name);
469 rc = 0;
470 goto out_unlock;
471 }
472 if (refcount_read(&seg->ref_count) != 1) {
473 pr_warn("DCSS %s is in use and cannot be reloaded\n", name);
474 rc = -EAGAIN;
475 goto out_unlock;
476 }
477 release_resource(seg->res);
478 if (do_nonshared)
479 seg->res->flags &= ~IORESOURCE_READONLY;
480 else
481 if (seg->vm_segtype == SEG_TYPE_SR ||
482 seg->vm_segtype == SEG_TYPE_ER)
483 seg->res->flags |= IORESOURCE_READONLY;
484
485 if (request_resource(&iomem_resource, seg->res)) {
486 pr_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n",
487 name);
488 rc = -EBUSY;
489 kfree(seg->res);
490 goto out_del_mem;
491 }
492
493 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
494 if (do_nonshared)
495 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
496 &start_addr, &end_addr);
497 else
498 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
499 &start_addr, &end_addr);
500 if (diag_cc < 0) {
501 rc = diag_cc;
502 goto out_del_res;
503 }
504 if (diag_cc > 1) {
505 pr_warn("Reloading DCSS %s failed with rc=%ld\n",
506 name, end_addr);
507 rc = dcss_diag_translate_rc(end_addr);
508 goto out_del_res;
509 }
510 seg->start_addr = start_addr;
511 seg->end = end_addr;
512 seg->do_nonshared = do_nonshared;
513 rc = 0;
514 goto out_unlock;
515 out_del_res:
516 release_resource(seg->res);
517 kfree(seg->res);
518 out_del_mem:
519 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
520 list_del(&seg->list);
521 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
522 kfree(seg);
523 out_unlock:
524 mutex_unlock(&dcss_lock);
525 return rc;
526}
527
528/*
529 * Decrease the use count of a DCSS segment and remove
530 * it from the address space if nobody is using it
531 * any longer.
532 */
533void
534segment_unload(char *name)
535{
536 unsigned long dummy;
537 struct dcss_segment *seg;
538
539 if (!MACHINE_IS_VM)
540 return;
541
542 mutex_lock(&dcss_lock);
543 seg = segment_by_name (name);
544 if (seg == NULL) {
545 pr_err("Unloading unknown DCSS %s failed\n", name);
546 goto out_unlock;
547 }
548 if (!refcount_dec_and_test(&seg->ref_count))
549 goto out_unlock;
550 release_resource(seg->res);
551 kfree(seg->res);
552 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
553 list_del(&seg->list);
554 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
555 kfree(seg);
556out_unlock:
557 mutex_unlock(&dcss_lock);
558}
559
560/*
561 * save segment content permanently
562 */
563void
564segment_save(char *name)
565{
566 struct dcss_segment *seg;
567 char cmd1[160];
568 char cmd2[80];
569 int i, response;
570
571 if (!MACHINE_IS_VM)
572 return;
573
574 mutex_lock(&dcss_lock);
575 seg = segment_by_name (name);
576
577 if (seg == NULL) {
578 pr_err("Saving unknown DCSS %s failed\n", name);
579 goto out;
580 }
581
582 sprintf(cmd1, "DEFSEG %s", name);
583 for (i=0; i<seg->segcnt; i++) {
584 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
585 seg->range[i].start >> PAGE_SHIFT,
586 seg->range[i].end >> PAGE_SHIFT,
587 segtype_string[seg->range[i].start & 0xff]);
588 }
589 sprintf(cmd2, "SAVESEG %s", name);
590 response = 0;
591 cpcmd(cmd1, NULL, 0, &response);
592 if (response) {
593 pr_err("Saving a DCSS failed with DEFSEG response code "
594 "%i\n", response);
595 goto out;
596 }
597 cpcmd(cmd2, NULL, 0, &response);
598 if (response) {
599 pr_err("Saving a DCSS failed with SAVESEG response code "
600 "%i\n", response);
601 goto out;
602 }
603out:
604 mutex_unlock(&dcss_lock);
605}
606
607/*
608 * print appropriate error message for segment_load()/segment_type()
609 * return code
610 */
611void segment_warning(int rc, char *seg_name)
612{
613 switch (rc) {
614 case -ENOENT:
615 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
616 break;
617 case -ENOSYS:
618 pr_err("DCSS %s cannot be loaded or queried without "
619 "z/VM\n", seg_name);
620 break;
621 case -EIO:
622 pr_err("Loading or querying DCSS %s resulted in a "
623 "hardware error\n", seg_name);
624 break;
625 case -EOPNOTSUPP:
626 pr_err("DCSS %s has multiple page ranges and cannot be "
627 "loaded or queried\n", seg_name);
628 break;
629 case -EBUSY:
630 pr_err("%s needs used memory resources and cannot be "
631 "loaded or queried\n", seg_name);
632 break;
633 case -EPERM:
634 pr_err("DCSS %s is already loaded in a different access "
635 "mode\n", seg_name);
636 break;
637 case -ENOMEM:
638 pr_err("There is not enough memory to load or query "
639 "DCSS %s\n", seg_name);
640 break;
641 case -ERANGE:
642 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
643 "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
644 break;
645 default:
646 break;
647 }
648}
649
650EXPORT_SYMBOL(segment_load);
651EXPORT_SYMBOL(segment_unload);
652EXPORT_SYMBOL(segment_save);
653EXPORT_SYMBOL(segment_type);
654EXPORT_SYMBOL(segment_modify_shared);
655EXPORT_SYMBOL(segment_warning);
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/diag.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
42struct qrange {
43 unsigned long start; /* last byte type */
44 unsigned long end; /* last byte reserved */
45};
46
47struct qout64 {
48 unsigned long segstart;
49 unsigned long segend;
50 int segcnt;
51 int segrcnt;
52 struct qrange range[6];
53};
54
55struct 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' */
61struct qout64_old {
62 int segstart;
63 int segend;
64 int segcnt;
65 int segrcnt;
66 struct qrange_old range[6];
67};
68
69struct qin64 {
70 char qopcode;
71 char rsrv1[3];
72 char qrcode;
73 char rsrv2[3];
74 char qname[8];
75 unsigned int qoutptr;
76 short int qoutlen;
77};
78
79struct dcss_segment {
80 struct list_head list;
81 char dcss_name[8];
82 char res_name[15];
83 unsigned long start_addr;
84 unsigned long end;
85 atomic_t ref_count;
86 int do_nonshared;
87 unsigned int vm_segtype;
88 struct qrange range[6];
89 int segcnt;
90 struct resource *res;
91};
92
93static DEFINE_MUTEX(dcss_lock);
94static LIST_HEAD(dcss_list);
95static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
96 "EW/EN-MIXED" };
97static int loadshr_scode, loadnsr_scode;
98static int segext_scode, purgeseg_scode;
99static int scode_set;
100
101/* set correct Diag x'64' subcodes. */
102static int
103dcss_set_subcodes(void)
104{
105 char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA);
106 unsigned long rx, ry;
107 int rc;
108
109 if (name == NULL)
110 return -ENOMEM;
111
112 rx = (unsigned long) name;
113 ry = DCSS_FINDSEGX;
114
115 strcpy(name, "dummy");
116 diag_stat_inc(DIAG_STAT_X064);
117 asm volatile(
118 " diag %0,%1,0x64\n"
119 "0: ipm %2\n"
120 " srl %2,28\n"
121 " j 2f\n"
122 "1: la %2,3\n"
123 "2:\n"
124 EX_TABLE(0b, 1b)
125 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc", "memory");
126
127 kfree(name);
128 /* Diag x'64' new subcodes are supported, set to new subcodes */
129 if (rc != 3) {
130 loadshr_scode = DCSS_LOADSHRX;
131 loadnsr_scode = DCSS_LOADNSRX;
132 purgeseg_scode = DCSS_PURGESEG;
133 segext_scode = DCSS_SEGEXTX;
134 return 0;
135 }
136 /* Diag x'64' new subcodes are not supported, set to old subcodes */
137 loadshr_scode = DCSS_LOADNOLY;
138 loadnsr_scode = DCSS_LOADNSR;
139 purgeseg_scode = DCSS_PURGESEG;
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 */
148static void
149dcss_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 */
168static struct dcss_segment *
169segment_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 */
191static inline int
192dcss_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 diag_stat_inc(DIAG_STAT_X064);
209 if (*func > DCSS_SEGEXT)
210 asm volatile(
211 " diag %0,%1,0x64\n"
212 " ipm %2\n"
213 " srl %2,28\n"
214 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
215 /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
216 else
217 asm volatile(
218 " sam31\n"
219 " diag %0,%1,0x64\n"
220 " sam64\n"
221 " ipm %2\n"
222 " srl %2,28\n"
223 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
224 *ret1 = rx;
225 *ret2 = ry;
226 return rc;
227}
228
229static inline int
230dcss_diag_translate_rc (int vm_rc) {
231 if (vm_rc == 44)
232 return -ENOENT;
233 return -EIO;
234}
235
236
237/* do a diag to get info about a segment.
238 * fills start_address, end and vm_segtype fields
239 */
240static int
241query_segment_type (struct dcss_segment *seg)
242{
243 unsigned long dummy, vmrc;
244 int diag_cc, rc, i;
245 struct qout64 *qout;
246 struct qin64 *qin;
247
248 qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
249 qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
250 if ((qin == NULL) || (qout == NULL)) {
251 rc = -ENOMEM;
252 goto out_free;
253 }
254
255 /* initialize diag input parameters */
256 qin->qopcode = DCSS_FINDSEGA;
257 qin->qoutptr = (unsigned long) qout;
258 qin->qoutlen = sizeof(struct qout64);
259 memcpy (qin->qname, seg->dcss_name, 8);
260
261 diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
262
263 if (diag_cc < 0) {
264 rc = diag_cc;
265 goto out_free;
266 }
267 if (diag_cc > 1) {
268 pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc);
269 rc = dcss_diag_translate_rc (vmrc);
270 goto out_free;
271 }
272
273 /* Only old format of output area of Diagnose x'64' is supported,
274 copy data for the new format. */
275 if (segext_scode == DCSS_SEGEXT) {
276 struct qout64_old *qout_old;
277 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
278 if (qout_old == NULL) {
279 rc = -ENOMEM;
280 goto out_free;
281 }
282 memcpy(qout_old, qout, sizeof(struct qout64_old));
283 qout->segstart = (unsigned long) qout_old->segstart;
284 qout->segend = (unsigned long) qout_old->segend;
285 qout->segcnt = qout_old->segcnt;
286 qout->segrcnt = qout_old->segrcnt;
287
288 if (qout->segcnt > 6)
289 qout->segrcnt = 6;
290 for (i = 0; i < qout->segrcnt; i++) {
291 qout->range[i].start =
292 (unsigned long) qout_old->range[i].start;
293 qout->range[i].end =
294 (unsigned long) qout_old->range[i].end;
295 }
296 kfree(qout_old);
297 }
298 if (qout->segcnt > 6) {
299 rc = -EOPNOTSUPP;
300 goto out_free;
301 }
302
303 if (qout->segcnt == 1) {
304 seg->vm_segtype = qout->range[0].start & 0xff;
305 } else {
306 /* multi-part segment. only one type supported here:
307 - all parts are contiguous
308 - all parts are either EW or EN type
309 - maximum 6 parts allowed */
310 unsigned long start = qout->segstart >> PAGE_SHIFT;
311 for (i=0; i<qout->segcnt; i++) {
312 if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
313 ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
314 rc = -EOPNOTSUPP;
315 goto out_free;
316 }
317 if (start != qout->range[i].start >> PAGE_SHIFT) {
318 rc = -EOPNOTSUPP;
319 goto out_free;
320 }
321 start = (qout->range[i].end >> PAGE_SHIFT) + 1;
322 }
323 seg->vm_segtype = SEG_TYPE_EWEN;
324 }
325
326 /* analyze diag output and update seg */
327 seg->start_addr = qout->segstart;
328 seg->end = qout->segend;
329
330 memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
331 seg->segcnt = qout->segcnt;
332
333 rc = 0;
334
335 out_free:
336 kfree(qin);
337 kfree(qout);
338 return rc;
339}
340
341/*
342 * get info about a segment
343 * possible return values:
344 * -ENOSYS : we are not running on VM
345 * -EIO : could not perform query diagnose
346 * -ENOENT : no such segment
347 * -EOPNOTSUPP: multi-part segment cannot be used with linux
348 * -ENOMEM : out of memory
349 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
350 */
351int
352segment_type (char* name)
353{
354 int rc;
355 struct dcss_segment seg;
356
357 if (!MACHINE_IS_VM)
358 return -ENOSYS;
359
360 dcss_mkname(name, seg.dcss_name);
361 rc = query_segment_type (&seg);
362 if (rc < 0)
363 return rc;
364 return seg.vm_segtype;
365}
366
367/*
368 * check if segment collides with other segments that are currently loaded
369 * returns 1 if this is the case, 0 if no collision was found
370 */
371static int
372segment_overlaps_others (struct dcss_segment *seg)
373{
374 struct list_head *l;
375 struct dcss_segment *tmp;
376
377 BUG_ON(!mutex_is_locked(&dcss_lock));
378 list_for_each(l, &dcss_list) {
379 tmp = list_entry(l, struct dcss_segment, list);
380 if ((tmp->start_addr >> 20) > (seg->end >> 20))
381 continue;
382 if ((tmp->end >> 20) < (seg->start_addr >> 20))
383 continue;
384 if (seg == tmp)
385 continue;
386 return 1;
387 }
388 return 0;
389}
390
391/*
392 * real segment loading function, called from segment_load
393 */
394static int
395__segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
396{
397 unsigned long start_addr, end_addr, dummy;
398 struct dcss_segment *seg;
399 int rc, diag_cc;
400
401 start_addr = end_addr = 0;
402 seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
403 if (seg == NULL) {
404 rc = -ENOMEM;
405 goto out;
406 }
407 dcss_mkname (name, seg->dcss_name);
408 rc = query_segment_type (seg);
409 if (rc < 0)
410 goto out_free;
411
412 if (loadshr_scode == DCSS_LOADSHRX) {
413 if (segment_overlaps_others(seg)) {
414 rc = -EBUSY;
415 goto out_free;
416 }
417 }
418
419 rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
420
421 if (rc)
422 goto out_free;
423
424 seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
425 if (seg->res == NULL) {
426 rc = -ENOMEM;
427 goto out_shared;
428 }
429 seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
430 seg->res->start = seg->start_addr;
431 seg->res->end = seg->end;
432 memcpy(&seg->res_name, seg->dcss_name, 8);
433 EBCASC(seg->res_name, 8);
434 seg->res_name[8] = '\0';
435 strncat(seg->res_name, " (DCSS)", 7);
436 seg->res->name = seg->res_name;
437 rc = seg->vm_segtype;
438 if (rc == SEG_TYPE_SC ||
439 ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
440 seg->res->flags |= IORESOURCE_READONLY;
441 if (request_resource(&iomem_resource, seg->res)) {
442 rc = -EBUSY;
443 kfree(seg->res);
444 goto out_shared;
445 }
446
447 if (do_nonshared)
448 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
449 &start_addr, &end_addr);
450 else
451 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
452 &start_addr, &end_addr);
453 if (diag_cc < 0) {
454 dcss_diag(&purgeseg_scode, seg->dcss_name,
455 &dummy, &dummy);
456 rc = diag_cc;
457 goto out_resource;
458 }
459 if (diag_cc > 1) {
460 pr_warn("Loading DCSS %s failed with rc=%ld\n", name, 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 */
513int
514segment_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 */
555int
556segment_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_warn("DCSS %s is in use and cannot be reloaded\n", name);
577 rc = -EAGAIN;
578 goto out_unlock;
579 }
580 release_resource(seg->res);
581 if (do_nonshared)
582 seg->res->flags &= ~IORESOURCE_READONLY;
583 else
584 if (seg->vm_segtype == SEG_TYPE_SR ||
585 seg->vm_segtype == SEG_TYPE_ER)
586 seg->res->flags |= IORESOURCE_READONLY;
587
588 if (request_resource(&iomem_resource, seg->res)) {
589 pr_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n",
590 name);
591 rc = -EBUSY;
592 kfree(seg->res);
593 goto out_del_mem;
594 }
595
596 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
597 if (do_nonshared)
598 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
599 &start_addr, &end_addr);
600 else
601 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
602 &start_addr, &end_addr);
603 if (diag_cc < 0) {
604 rc = diag_cc;
605 goto out_del_res;
606 }
607 if (diag_cc > 1) {
608 pr_warn("Reloading DCSS %s failed with rc=%ld\n",
609 name, end_addr);
610 rc = dcss_diag_translate_rc(end_addr);
611 goto out_del_res;
612 }
613 seg->start_addr = start_addr;
614 seg->end = end_addr;
615 seg->do_nonshared = do_nonshared;
616 rc = 0;
617 goto out_unlock;
618 out_del_res:
619 release_resource(seg->res);
620 kfree(seg->res);
621 out_del_mem:
622 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
623 list_del(&seg->list);
624 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
625 kfree(seg);
626 out_unlock:
627 mutex_unlock(&dcss_lock);
628 return rc;
629}
630
631/*
632 * Decrease the use count of a DCSS segment and remove
633 * it from the address space if nobody is using it
634 * any longer.
635 */
636void
637segment_unload(char *name)
638{
639 unsigned long dummy;
640 struct dcss_segment *seg;
641
642 if (!MACHINE_IS_VM)
643 return;
644
645 mutex_lock(&dcss_lock);
646 seg = segment_by_name (name);
647 if (seg == NULL) {
648 pr_err("Unloading unknown DCSS %s failed\n", name);
649 goto out_unlock;
650 }
651 if (atomic_dec_return(&seg->ref_count) != 0)
652 goto out_unlock;
653 release_resource(seg->res);
654 kfree(seg->res);
655 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
656 list_del(&seg->list);
657 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
658 kfree(seg);
659out_unlock:
660 mutex_unlock(&dcss_lock);
661}
662
663/*
664 * save segment content permanently
665 */
666void
667segment_save(char *name)
668{
669 struct dcss_segment *seg;
670 char cmd1[160];
671 char cmd2[80];
672 int i, response;
673
674 if (!MACHINE_IS_VM)
675 return;
676
677 mutex_lock(&dcss_lock);
678 seg = segment_by_name (name);
679
680 if (seg == NULL) {
681 pr_err("Saving unknown DCSS %s failed\n", name);
682 goto out;
683 }
684
685 sprintf(cmd1, "DEFSEG %s", name);
686 for (i=0; i<seg->segcnt; i++) {
687 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
688 seg->range[i].start >> PAGE_SHIFT,
689 seg->range[i].end >> PAGE_SHIFT,
690 segtype_string[seg->range[i].start & 0xff]);
691 }
692 sprintf(cmd2, "SAVESEG %s", name);
693 response = 0;
694 cpcmd(cmd1, NULL, 0, &response);
695 if (response) {
696 pr_err("Saving a DCSS failed with DEFSEG response code "
697 "%i\n", response);
698 goto out;
699 }
700 cpcmd(cmd2, NULL, 0, &response);
701 if (response) {
702 pr_err("Saving a DCSS failed with SAVESEG response code "
703 "%i\n", response);
704 goto out;
705 }
706out:
707 mutex_unlock(&dcss_lock);
708}
709
710/*
711 * print appropriate error message for segment_load()/segment_type()
712 * return code
713 */
714void segment_warning(int rc, char *seg_name)
715{
716 switch (rc) {
717 case -ENOENT:
718 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
719 break;
720 case -ENOSYS:
721 pr_err("DCSS %s cannot be loaded or queried without "
722 "z/VM\n", seg_name);
723 break;
724 case -EIO:
725 pr_err("Loading or querying DCSS %s resulted in a "
726 "hardware error\n", seg_name);
727 break;
728 case -EOPNOTSUPP:
729 pr_err("DCSS %s has multiple page ranges and cannot be "
730 "loaded or queried\n", seg_name);
731 break;
732 case -ENOSPC:
733 pr_err("DCSS %s overlaps with used storage and cannot "
734 "be loaded\n", seg_name);
735 break;
736 case -EBUSY:
737 pr_err("%s needs used memory resources and cannot be "
738 "loaded or queried\n", seg_name);
739 break;
740 case -EPERM:
741 pr_err("DCSS %s is already loaded in a different access "
742 "mode\n", seg_name);
743 break;
744 case -ENOMEM:
745 pr_err("There is not enough memory to load or query "
746 "DCSS %s\n", seg_name);
747 break;
748 case -ERANGE:
749 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
750 "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
751 break;
752 default:
753 break;
754 }
755}
756
757EXPORT_SYMBOL(segment_load);
758EXPORT_SYMBOL(segment_unload);
759EXPORT_SYMBOL(segment_save);
760EXPORT_SYMBOL(segment_type);
761EXPORT_SYMBOL(segment_modify_shared);
762EXPORT_SYMBOL(segment_warning);