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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
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> | |
a53c8fab | 6 | * Copyright IBM Corp. 2002, 2004 |
1da177e4 LT |
7 | */ |
8 | ||
93098bf0 HY |
9 | #define KMSG_COMPONENT "extmem" |
10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
11 | ||
1da177e4 LT |
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> | |
36a2bd42 | 19 | #include <linux/ctype.h> |
444f0e54 | 20 | #include <linux/ioport.h> |
1da177e4 | 21 | #include <asm/page.h> |
f4eb07c1 | 22 | #include <asm/pgtable.h> |
1da177e4 LT |
23 | #include <asm/ebcdic.h> |
24 | #include <asm/errno.h> | |
25 | #include <asm/extmem.h> | |
26 | #include <asm/cpcmd.h> | |
36a2bd42 | 27 | #include <asm/setup.h> |
1da177e4 | 28 | |
1da177e4 LT |
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 | |
b2300b9e HY |
35 | #define DCSS_LOADSHRX 0x20 |
36 | #define DCSS_LOADNSRX 0x24 | |
37 | #define DCSS_FINDSEGX 0x2c | |
38 | #define DCSS_SEGEXTX 0x38 | |
1da177e4 LT |
39 | #define DCSS_FINDSEGA 0x0c |
40 | ||
41 | struct qrange { | |
b2300b9e HY |
42 | unsigned long start; /* last byte type */ |
43 | unsigned long end; /* last byte reserved */ | |
1da177e4 LT |
44 | }; |
45 | ||
46 | struct qout64 { | |
b2300b9e HY |
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 { | |
1da177e4 LT |
62 | int segstart; |
63 | int segend; | |
64 | int segcnt; | |
65 | int segrcnt; | |
b2300b9e | 66 | struct qrange_old range[6]; |
1da177e4 | 67 | }; |
b2300b9e | 68 | #endif |
1da177e4 LT |
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]; | |
444f0e54 | 83 | char res_name[15]; |
1da177e4 LT |
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; | |
444f0e54 | 91 | struct resource *res; |
1da177e4 LT |
92 | }; |
93 | ||
09252e77 | 94 | static DEFINE_MUTEX(dcss_lock); |
c11ca97e | 95 | static LIST_HEAD(dcss_list); |
1da177e4 LT |
96 | static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC", |
97 | "EW/EN-MIXED" }; | |
b2300b9e HY |
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 | |
c2f0e8c8 | 107 | char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA); |
b2300b9e HY |
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 | } | |
1da177e4 | 147 | |
1da177e4 LT |
148 | /* |
149 | * Create the 8 bytes, ebcdic VM segment name from | |
150 | * an ascii name. | |
151 | */ | |
4d284cac | 152 | static void |
1da177e4 LT |
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 | ||
09252e77 | 179 | BUG_ON(!mutex_is_locked(&dcss_lock)); |
1da177e4 LT |
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 | |
b2300b9e | 196 | dcss_diag(int *func, void *parameter, |
1da177e4 LT |
197 | unsigned long *ret1, unsigned long *ret2) |
198 | { | |
199 | unsigned long rx, ry; | |
200 | int rc; | |
201 | ||
b2300b9e HY |
202 | if (scode_set == 0) { |
203 | rc = dcss_set_subcodes(); | |
204 | if (rc < 0) | |
205 | return rc; | |
206 | scode_set = 1; | |
207 | } | |
1da177e4 | 208 | rx = (unsigned long) parameter; |
b2300b9e HY |
209 | ry = (unsigned long) *func; |
210 | ||
347a8dc3 | 211 | #ifdef CONFIG_64BIT |
b2300b9e HY |
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"); | |
1da177e4 | 228 | #else |
b2300b9e | 229 | asm volatile( |
94c12cc7 | 230 | " diag %0,%1,0x64\n" |
94c12cc7 MS |
231 | " ipm %2\n" |
232 | " srl %2,28\n" | |
233 | : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); | |
b2300b9e | 234 | #endif |
1da177e4 LT |
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 | { | |
1da177e4 | 254 | unsigned long dummy, vmrc; |
c2f0e8c8 HC |
255 | int diag_cc, rc, i; |
256 | struct qout64 *qout; | |
257 | struct qin64 *qin; | |
1da177e4 | 258 | |
c2f0e8c8 HC |
259 | qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA); |
260 | qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA); | |
1da177e4 LT |
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 | ||
b2300b9e | 272 | diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc); |
1da177e4 | 273 | |
b2300b9e HY |
274 | if (diag_cc < 0) { |
275 | rc = diag_cc; | |
276 | goto out_free; | |
277 | } | |
1da177e4 | 278 | if (diag_cc > 1) { |
93098bf0 | 279 | pr_warning("Querying a DCSS type failed with rc=%ld\n", vmrc); |
1da177e4 LT |
280 | rc = dcss_diag_translate_rc (vmrc); |
281 | goto out_free; | |
282 | } | |
283 | ||
b2300b9e HY |
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; | |
c2f0e8c8 | 289 | qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA); |
b2300b9e HY |
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 | |
1da177e4 | 311 | if (qout->segcnt > 6) { |
b8e660b8 | 312 | rc = -EOPNOTSUPP; |
1da177e4 LT |
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)) { | |
b8e660b8 | 327 | rc = -EOPNOTSUPP; |
1da177e4 LT |
328 | goto out_free; |
329 | } | |
330 | if (start != qout->range[i].start >> PAGE_SHIFT) { | |
b8e660b8 | 331 | rc = -EOPNOTSUPP; |
1da177e4 LT |
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: | |
b2325fe1 JJ |
349 | kfree(qin); |
350 | kfree(qout); | |
1da177e4 LT |
351 | return rc; |
352 | } | |
353 | ||
1da177e4 LT |
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 | |
b8e660b8 | 360 | * -EOPNOTSUPP: multi-part segment cannot be used with linux |
1da177e4 LT |
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 | ||
b2300b9e HY |
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 | ||
1da177e4 LT |
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 | { | |
b2300b9e | 410 | unsigned long start_addr, end_addr, dummy; |
c2f0e8c8 HC |
411 | struct dcss_segment *seg; |
412 | int rc, diag_cc; | |
1da177e4 | 413 | |
89db4df1 | 414 | start_addr = end_addr = 0; |
c2f0e8c8 | 415 | seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
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; | |
f4eb07c1 | 424 | |
b2300b9e HY |
425 | if (loadshr_scode == DCSS_LOADSHRX) { |
426 | if (segment_overlaps_others(seg)) { | |
427 | rc = -EBUSY; | |
428 | goto out_free; | |
429 | } | |
430 | } | |
431 | ||
17f34580 | 432 | rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
f4eb07c1 | 433 | |
ca68305b | 434 | if (rc) |
1da177e4 | 435 | goto out_free; |
f4eb07c1 | 436 | |
444f0e54 GS |
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 | ||
1da177e4 | 460 | if (do_nonshared) |
b2300b9e HY |
461 | diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name, |
462 | &start_addr, &end_addr); | |
1da177e4 | 463 | else |
b2300b9e HY |
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 | } | |
1da177e4 | 472 | if (diag_cc > 1) { |
93098bf0 HY |
473 | pr_warning("Loading DCSS %s failed with rc=%ld\n", name, |
474 | end_addr); | |
b2300b9e HY |
475 | rc = dcss_diag_translate_rc(end_addr); |
476 | dcss_diag(&purgeseg_scode, seg->dcss_name, | |
477 | &dummy, &dummy); | |
444f0e54 | 478 | goto out_resource; |
1da177e4 | 479 | } |
b2300b9e HY |
480 | seg->start_addr = start_addr; |
481 | seg->end = end_addr; | |
1da177e4 LT |
482 | seg->do_nonshared = do_nonshared; |
483 | atomic_set(&seg->ref_count, 1); | |
484 | list_add(&seg->list, &dcss_list); | |
1da177e4 LT |
485 | *addr = seg->start_addr; |
486 | *end = seg->end; | |
487 | if (do_nonshared) | |
93098bf0 HY |
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]); | |
444f0e54 | 491 | else { |
93098bf0 HY |
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]); | |
444f0e54 | 495 | } |
1da177e4 | 496 | goto out; |
444f0e54 GS |
497 | out_resource: |
498 | release_resource(seg->res); | |
499 | kfree(seg->res); | |
f4eb07c1 | 500 | out_shared: |
17f34580 | 501 | vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
1da177e4 | 502 | out_free: |
b2325fe1 | 503 | kfree(seg); |
1da177e4 LT |
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 | |
b8e660b8 | 519 | * -EOPNOTSUPP: multi-part segment cannot be used with linux |
1da177e4 LT |
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 | ||
09252e77 | 537 | mutex_lock(&dcss_lock); |
1da177e4 LT |
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 | } | |
09252e77 | 552 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
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 | |
444f0e54 | 566 | * -EBUSY : segment can temporarily not be used (overlaps with dcss) |
1da177e4 LT |
567 | * 0 : operation succeeded |
568 | */ | |
569 | int | |
570 | segment_modify_shared (char *name, int do_nonshared) | |
571 | { | |
572 | struct dcss_segment *seg; | |
b2300b9e HY |
573 | unsigned long start_addr, end_addr, dummy; |
574 | int rc, diag_cc; | |
1da177e4 | 575 | |
89db4df1 | 576 | start_addr = end_addr = 0; |
09252e77 | 577 | mutex_lock(&dcss_lock); |
1da177e4 LT |
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) { | |
93098bf0 HY |
584 | pr_info("DCSS %s is already in the requested access " |
585 | "mode\n", name); | |
1da177e4 LT |
586 | rc = 0; |
587 | goto out_unlock; | |
588 | } | |
589 | if (atomic_read (&seg->ref_count) != 1) { | |
93098bf0 HY |
590 | pr_warning("DCSS %s is in use and cannot be reloaded\n", |
591 | name); | |
1da177e4 LT |
592 | rc = -EAGAIN; |
593 | goto out_unlock; | |
594 | } | |
444f0e54 | 595 | release_resource(seg->res); |
b2300b9e | 596 | if (do_nonshared) |
444f0e54 | 597 | seg->res->flags &= ~IORESOURCE_READONLY; |
b2300b9e | 598 | else |
444f0e54 GS |
599 | if (seg->vm_segtype == SEG_TYPE_SR || |
600 | seg->vm_segtype == SEG_TYPE_ER) | |
601 | seg->res->flags |= IORESOURCE_READONLY; | |
b2300b9e | 602 | |
444f0e54 | 603 | if (request_resource(&iomem_resource, seg->res)) { |
93098bf0 HY |
604 | pr_warning("DCSS %s overlaps with used memory resources " |
605 | "and cannot be reloaded\n", name); | |
444f0e54 GS |
606 | rc = -EBUSY; |
607 | kfree(seg->res); | |
b2300b9e HY |
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; | |
444f0e54 | 621 | } |
1da177e4 | 622 | if (diag_cc > 1) { |
93098bf0 HY |
623 | pr_warning("Reloading DCSS %s failed with rc=%ld\n", name, |
624 | end_addr); | |
b2300b9e HY |
625 | rc = dcss_diag_translate_rc(end_addr); |
626 | goto out_del_res; | |
1da177e4 | 627 | } |
b2300b9e HY |
628 | seg->start_addr = start_addr; |
629 | seg->end = end_addr; | |
1da177e4 LT |
630 | seg->do_nonshared = do_nonshared; |
631 | rc = 0; | |
632 | goto out_unlock; | |
b2300b9e HY |
633 | out_del_res: |
634 | release_resource(seg->res); | |
635 | kfree(seg->res); | |
636 | out_del_mem: | |
17f34580 | 637 | vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
1da177e4 | 638 | list_del(&seg->list); |
b2300b9e | 639 | dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
b2325fe1 | 640 | kfree(seg); |
1da177e4 | 641 | out_unlock: |
09252e77 | 642 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
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 | ||
09252e77 | 660 | mutex_lock(&dcss_lock); |
1da177e4 LT |
661 | seg = segment_by_name (name); |
662 | if (seg == NULL) { | |
93098bf0 | 663 | pr_err("Unloading unknown DCSS %s failed\n", name); |
1da177e4 LT |
664 | goto out_unlock; |
665 | } | |
f4eb07c1 HC |
666 | if (atomic_dec_return(&seg->ref_count) != 0) |
667 | goto out_unlock; | |
444f0e54 GS |
668 | release_resource(seg->res); |
669 | kfree(seg->res); | |
17f34580 | 670 | vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
f4eb07c1 | 671 | list_del(&seg->list); |
b2300b9e | 672 | dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
f4eb07c1 | 673 | kfree(seg); |
1da177e4 | 674 | out_unlock: |
09252e77 | 675 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
676 | } |
677 | ||
678 | /* | |
679 | * save segment content permanently | |
680 | */ | |
681 | void | |
682 | segment_save(char *name) | |
683 | { | |
684 | struct dcss_segment *seg; | |
1da177e4 LT |
685 | char cmd1[160]; |
686 | char cmd2[80]; | |
9b5dec1a | 687 | int i, response; |
1da177e4 LT |
688 | |
689 | if (!MACHINE_IS_VM) | |
690 | return; | |
691 | ||
09252e77 | 692 | mutex_lock(&dcss_lock); |
1da177e4 LT |
693 | seg = segment_by_name (name); |
694 | ||
695 | if (seg == NULL) { | |
93098bf0 | 696 | pr_err("Saving unknown DCSS %s failed\n", name); |
6b4044bd | 697 | goto out; |
1da177e4 LT |
698 | } |
699 | ||
1da177e4 LT |
700 | sprintf(cmd1, "DEFSEG %s", name); |
701 | for (i=0; i<seg->segcnt; i++) { | |
b2300b9e | 702 | sprintf(cmd1+strlen(cmd1), " %lX-%lX %s", |
1da177e4 LT |
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); | |
9b5dec1a GS |
708 | response = 0; |
709 | cpcmd(cmd1, NULL, 0, &response); | |
710 | if (response) { | |
93098bf0 HY |
711 | pr_err("Saving a DCSS failed with DEFSEG response code " |
712 | "%i\n", response); | |
9b5dec1a GS |
713 | goto out; |
714 | } | |
715 | cpcmd(cmd2, NULL, 0, &response); | |
716 | if (response) { | |
93098bf0 HY |
717 | pr_err("Saving a DCSS failed with SAVESEG response code " |
718 | "%i\n", response); | |
9b5dec1a GS |
719 | goto out; |
720 | } | |
721 | out: | |
09252e77 | 722 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
723 | } |
724 | ||
ca68305b MS |
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: | |
93098bf0 | 733 | pr_err("DCSS %s cannot be loaded or queried\n", seg_name); |
ca68305b MS |
734 | break; |
735 | case -ENOSYS: | |
93098bf0 HY |
736 | pr_err("DCSS %s cannot be loaded or queried without " |
737 | "z/VM\n", seg_name); | |
ca68305b MS |
738 | break; |
739 | case -EIO: | |
93098bf0 HY |
740 | pr_err("Loading or querying DCSS %s resulted in a " |
741 | "hardware error\n", seg_name); | |
ca68305b | 742 | break; |
b8e660b8 | 743 | case -EOPNOTSUPP: |
93098bf0 HY |
744 | pr_err("DCSS %s has multiple page ranges and cannot be " |
745 | "loaded or queried\n", seg_name); | |
ca68305b MS |
746 | break; |
747 | case -ENOSPC: | |
93098bf0 HY |
748 | pr_err("DCSS %s overlaps with used storage and cannot " |
749 | "be loaded\n", seg_name); | |
ca68305b MS |
750 | break; |
751 | case -EBUSY: | |
93098bf0 HY |
752 | pr_err("%s needs used memory resources and cannot be " |
753 | "loaded or queried\n", seg_name); | |
ca68305b MS |
754 | break; |
755 | case -EPERM: | |
93098bf0 HY |
756 | pr_err("DCSS %s is already loaded in a different access " |
757 | "mode\n", seg_name); | |
ca68305b MS |
758 | break; |
759 | case -ENOMEM: | |
93098bf0 HY |
760 | pr_err("There is not enough memory to load or query " |
761 | "DCSS %s\n", seg_name); | |
ca68305b MS |
762 | break; |
763 | case -ERANGE: | |
93098bf0 HY |
764 | pr_err("DCSS %s exceeds the kernel mapping range (%lu) " |
765 | "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS); | |
ca68305b MS |
766 | break; |
767 | default: | |
ca68305b MS |
768 | break; |
769 | } | |
770 | } | |
771 | ||
1da177e4 LT |
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); | |
ca68305b | 777 | EXPORT_SYMBOL(segment_warning); |