]>
Commit | Line | Data |
---|---|---|
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/export.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 | ||
42 | struct qrange { | |
43 | unsigned long start; /* last byte type */ | |
44 | unsigned long end; /* last byte reserved */ | |
45 | }; | |
46 | ||
47 | struct qout64 { | |
48 | unsigned long segstart; | |
49 | unsigned long segend; | |
50 | int segcnt; | |
51 | int segrcnt; | |
52 | struct qrange range[6]; | |
53 | }; | |
54 | ||
55 | 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 | ||
69 | struct 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 | ||
79 | struct 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 | ||
93 | static DEFINE_MUTEX(dcss_lock); | |
94 | static LIST_HEAD(dcss_list); | |
95 | static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC", | |
96 | "EW/EN-MIXED" }; | |
97 | static int loadshr_scode, loadnsr_scode; | |
98 | static int segext_scode, purgeseg_scode; | |
99 | static int scode_set; | |
100 | ||
101 | /* set correct Diag x'64' subcodes. */ | |
102 | static int | |
103 | dcss_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 | */ | |
148 | static void | |
149 | dcss_mkname(char *name, char *dcss_name) | |
150 | { | |
151 | int i; | |
152 | ||
153 | for (i = 0; i < 8; i++) { | |
154 | if (name[i] == '\0') | |
155 | break; | |
156 | dcss_name[i] = toupper(name[i]); | |
157 | } | |
158 | for (; i < 8; i++) | |
159 | dcss_name[i] = ' '; | |
160 | ASCEBC(dcss_name, 8); | |
161 | } | |
162 | ||
163 | ||
164 | /* | |
165 | * search all segments in dcss_list, and return the one | |
166 | * namend *name. If not found, return NULL. | |
167 | */ | |
168 | static struct dcss_segment * | |
169 | segment_by_name (char *name) | |
170 | { | |
171 | char dcss_name[9]; | |
172 | struct list_head *l; | |
173 | struct dcss_segment *tmp, *retval = NULL; | |
174 | ||
175 | BUG_ON(!mutex_is_locked(&dcss_lock)); | |
176 | dcss_mkname (name, dcss_name); | |
177 | list_for_each (l, &dcss_list) { | |
178 | tmp = list_entry (l, struct dcss_segment, list); | |
179 | if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) { | |
180 | retval = tmp; | |
181 | break; | |
182 | } | |
183 | } | |
184 | return retval; | |
185 | } | |
186 | ||
187 | ||
188 | /* | |
189 | * Perform a function on a dcss segment. | |
190 | */ | |
191 | static inline int | |
192 | dcss_diag(int *func, void *parameter, | |
193 | unsigned long *ret1, unsigned long *ret2) | |
194 | { | |
195 | unsigned long rx, ry; | |
196 | int rc; | |
197 | ||
198 | if (scode_set == 0) { | |
199 | rc = dcss_set_subcodes(); | |
200 | if (rc < 0) | |
201 | return rc; | |
202 | scode_set = 1; | |
203 | } | |
204 | rx = (unsigned long) parameter; | |
205 | ry = (unsigned long) *func; | |
206 | ||
207 | /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */ | |
208 | 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 | ||
229 | static inline int | |
230 | dcss_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 | */ | |
240 | static int | |
241 | query_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 | */ | |
351 | int | |
352 | segment_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 | */ | |
371 | static int | |
372 | segment_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 | */ | |
394 | static 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 | */ | |
513 | int | |
514 | segment_load (char *name, int do_nonshared, unsigned long *addr, | |
515 | unsigned long *end) | |
516 | { | |
517 | struct dcss_segment *seg; | |
518 | int rc; | |
519 | ||
520 | if (!MACHINE_IS_VM) | |
521 | return -ENOSYS; | |
522 | ||
523 | mutex_lock(&dcss_lock); | |
524 | seg = segment_by_name (name); | |
525 | if (seg == NULL) | |
526 | rc = __segment_load (name, do_nonshared, addr, end); | |
527 | else { | |
528 | if (do_nonshared == seg->do_nonshared) { | |
529 | atomic_inc(&seg->ref_count); | |
530 | *addr = seg->start_addr; | |
531 | *end = seg->end; | |
532 | rc = seg->vm_segtype; | |
533 | } else { | |
534 | *addr = *end = 0; | |
535 | rc = -EPERM; | |
536 | } | |
537 | } | |
538 | mutex_unlock(&dcss_lock); | |
539 | return rc; | |
540 | } | |
541 | ||
542 | /* | |
543 | * this function modifies the shared state of a DCSS segment. note that | |
544 | * name : name of the DCSS | |
545 | * do_nonshared : 0 indicates that the dcss should be shared with other linux images | |
546 | * 1 indicates that the dcss should be exclusive for this linux image | |
547 | * return values: | |
548 | * -EIO : could not perform load diagnose (segment gone!) | |
549 | * -ENOENT : no such segment (segment gone!) | |
550 | * -EAGAIN : segment is in use by other exploiters, try later | |
551 | * -EINVAL : no segment with the given name is currently loaded - name invalid | |
552 | * -EBUSY : segment can temporarily not be used (overlaps with dcss) | |
553 | * 0 : operation succeeded | |
554 | */ | |
555 | int | |
556 | segment_modify_shared (char *name, int do_nonshared) | |
557 | { | |
558 | struct dcss_segment *seg; | |
559 | unsigned long start_addr, end_addr, dummy; | |
560 | int rc, diag_cc; | |
561 | ||
562 | start_addr = end_addr = 0; | |
563 | mutex_lock(&dcss_lock); | |
564 | seg = segment_by_name (name); | |
565 | if (seg == NULL) { | |
566 | rc = -EINVAL; | |
567 | goto out_unlock; | |
568 | } | |
569 | if (do_nonshared == seg->do_nonshared) { | |
570 | pr_info("DCSS %s is already in the requested access " | |
571 | "mode\n", name); | |
572 | rc = 0; | |
573 | goto out_unlock; | |
574 | } | |
575 | if (atomic_read (&seg->ref_count) != 1) { | |
576 | pr_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 | */ | |
636 | void | |
637 | segment_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); | |
659 | out_unlock: | |
660 | mutex_unlock(&dcss_lock); | |
661 | } | |
662 | ||
663 | /* | |
664 | * save segment content permanently | |
665 | */ | |
666 | void | |
667 | segment_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 | } | |
706 | out: | |
707 | mutex_unlock(&dcss_lock); | |
708 | } | |
709 | ||
710 | /* | |
711 | * print appropriate error message for segment_load()/segment_type() | |
712 | * return code | |
713 | */ | |
714 | void 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 | ||
757 | EXPORT_SYMBOL(segment_load); | |
758 | EXPORT_SYMBOL(segment_unload); | |
759 | EXPORT_SYMBOL(segment_save); | |
760 | EXPORT_SYMBOL(segment_type); | |
761 | EXPORT_SYMBOL(segment_modify_shared); | |
762 | EXPORT_SYMBOL(segment_warning); |