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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 | ||
b2300b9e HY |
54 | struct qrange_old { |
55 | unsigned int start; /* last byte type */ | |
56 | unsigned int end; /* last byte reserved */ | |
57 | }; | |
58 | ||
59 | /* output area format for the Diag x'64' old subcode x'18' */ | |
60 | struct qout64_old { | |
1da177e4 LT |
61 | int segstart; |
62 | int segend; | |
63 | int segcnt; | |
64 | int segrcnt; | |
b2300b9e | 65 | struct qrange_old range[6]; |
1da177e4 LT |
66 | }; |
67 | ||
68 | struct qin64 { | |
69 | char qopcode; | |
70 | char rsrv1[3]; | |
71 | char qrcode; | |
72 | char rsrv2[3]; | |
73 | char qname[8]; | |
74 | unsigned int qoutptr; | |
75 | short int qoutlen; | |
76 | }; | |
77 | ||
78 | struct dcss_segment { | |
79 | struct list_head list; | |
80 | char dcss_name[8]; | |
444f0e54 | 81 | char res_name[15]; |
1da177e4 LT |
82 | unsigned long start_addr; |
83 | unsigned long end; | |
84 | atomic_t ref_count; | |
85 | int do_nonshared; | |
86 | unsigned int vm_segtype; | |
87 | struct qrange range[6]; | |
88 | int segcnt; | |
444f0e54 | 89 | struct resource *res; |
1da177e4 LT |
90 | }; |
91 | ||
09252e77 | 92 | static DEFINE_MUTEX(dcss_lock); |
c11ca97e | 93 | static LIST_HEAD(dcss_list); |
1da177e4 LT |
94 | static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC", |
95 | "EW/EN-MIXED" }; | |
b2300b9e HY |
96 | static int loadshr_scode, loadnsr_scode, findseg_scode; |
97 | static int segext_scode, purgeseg_scode; | |
98 | static int scode_set; | |
99 | ||
100 | /* set correct Diag x'64' subcodes. */ | |
101 | static int | |
102 | dcss_set_subcodes(void) | |
103 | { | |
c2f0e8c8 | 104 | char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA); |
b2300b9e HY |
105 | unsigned long rx, ry; |
106 | int rc; | |
107 | ||
108 | if (name == NULL) | |
109 | return -ENOMEM; | |
110 | ||
111 | rx = (unsigned long) name; | |
112 | ry = DCSS_FINDSEGX; | |
113 | ||
114 | strcpy(name, "dummy"); | |
115 | asm volatile( | |
116 | " diag %0,%1,0x64\n" | |
117 | "0: ipm %2\n" | |
118 | " srl %2,28\n" | |
119 | " j 2f\n" | |
120 | "1: la %2,3\n" | |
121 | "2:\n" | |
122 | EX_TABLE(0b, 1b) | |
123 | : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); | |
124 | ||
125 | kfree(name); | |
126 | /* Diag x'64' new subcodes are supported, set to new subcodes */ | |
127 | if (rc != 3) { | |
128 | loadshr_scode = DCSS_LOADSHRX; | |
129 | loadnsr_scode = DCSS_LOADNSRX; | |
130 | purgeseg_scode = DCSS_PURGESEG; | |
131 | findseg_scode = DCSS_FINDSEGX; | |
132 | segext_scode = DCSS_SEGEXTX; | |
133 | return 0; | |
134 | } | |
b2300b9e HY |
135 | /* Diag x'64' new subcodes are not supported, set to old subcodes */ |
136 | loadshr_scode = DCSS_LOADNOLY; | |
137 | loadnsr_scode = DCSS_LOADNSR; | |
138 | purgeseg_scode = DCSS_PURGESEG; | |
139 | findseg_scode = DCSS_FINDSEG; | |
140 | segext_scode = DCSS_SEGEXT; | |
141 | return 0; | |
142 | } | |
1da177e4 | 143 | |
1da177e4 LT |
144 | /* |
145 | * Create the 8 bytes, ebcdic VM segment name from | |
146 | * an ascii name. | |
147 | */ | |
4d284cac | 148 | static void |
1da177e4 LT |
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 | ||
09252e77 | 175 | BUG_ON(!mutex_is_locked(&dcss_lock)); |
1da177e4 LT |
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 | |
b2300b9e | 192 | dcss_diag(int *func, void *parameter, |
1da177e4 LT |
193 | unsigned long *ret1, unsigned long *ret2) |
194 | { | |
195 | unsigned long rx, ry; | |
196 | int rc; | |
197 | ||
b2300b9e HY |
198 | if (scode_set == 0) { |
199 | rc = dcss_set_subcodes(); | |
200 | if (rc < 0) | |
201 | return rc; | |
202 | scode_set = 1; | |
203 | } | |
1da177e4 | 204 | rx = (unsigned long) parameter; |
b2300b9e HY |
205 | ry = (unsigned long) *func; |
206 | ||
b2300b9e HY |
207 | /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */ |
208 | if (*func > DCSS_SEGEXT) | |
209 | asm volatile( | |
210 | " diag %0,%1,0x64\n" | |
211 | " ipm %2\n" | |
212 | " srl %2,28\n" | |
213 | : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); | |
214 | /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */ | |
215 | else | |
216 | asm volatile( | |
217 | " sam31\n" | |
218 | " diag %0,%1,0x64\n" | |
219 | " sam64\n" | |
220 | " ipm %2\n" | |
221 | " srl %2,28\n" | |
222 | : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); | |
1da177e4 LT |
223 | *ret1 = rx; |
224 | *ret2 = ry; | |
225 | return rc; | |
226 | } | |
227 | ||
228 | static inline int | |
229 | dcss_diag_translate_rc (int vm_rc) { | |
230 | if (vm_rc == 44) | |
231 | return -ENOENT; | |
232 | return -EIO; | |
233 | } | |
234 | ||
235 | ||
236 | /* do a diag to get info about a segment. | |
237 | * fills start_address, end and vm_segtype fields | |
238 | */ | |
239 | static int | |
240 | query_segment_type (struct dcss_segment *seg) | |
241 | { | |
1da177e4 | 242 | unsigned long dummy, vmrc; |
c2f0e8c8 HC |
243 | int diag_cc, rc, i; |
244 | struct qout64 *qout; | |
245 | struct qin64 *qin; | |
1da177e4 | 246 | |
c2f0e8c8 HC |
247 | qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA); |
248 | qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA); | |
1da177e4 LT |
249 | if ((qin == NULL) || (qout == NULL)) { |
250 | rc = -ENOMEM; | |
251 | goto out_free; | |
252 | } | |
253 | ||
254 | /* initialize diag input parameters */ | |
255 | qin->qopcode = DCSS_FINDSEGA; | |
256 | qin->qoutptr = (unsigned long) qout; | |
257 | qin->qoutlen = sizeof(struct qout64); | |
258 | memcpy (qin->qname, seg->dcss_name, 8); | |
259 | ||
b2300b9e | 260 | diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc); |
1da177e4 | 261 | |
b2300b9e HY |
262 | if (diag_cc < 0) { |
263 | rc = diag_cc; | |
264 | goto out_free; | |
265 | } | |
1da177e4 | 266 | if (diag_cc > 1) { |
93098bf0 | 267 | pr_warning("Querying a DCSS type failed with rc=%ld\n", vmrc); |
1da177e4 LT |
268 | rc = dcss_diag_translate_rc (vmrc); |
269 | goto out_free; | |
270 | } | |
271 | ||
b2300b9e HY |
272 | /* Only old format of output area of Diagnose x'64' is supported, |
273 | copy data for the new format. */ | |
274 | if (segext_scode == DCSS_SEGEXT) { | |
275 | struct qout64_old *qout_old; | |
c2f0e8c8 | 276 | qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA); |
b2300b9e HY |
277 | if (qout_old == NULL) { |
278 | rc = -ENOMEM; | |
279 | goto out_free; | |
280 | } | |
281 | memcpy(qout_old, qout, sizeof(struct qout64_old)); | |
282 | qout->segstart = (unsigned long) qout_old->segstart; | |
283 | qout->segend = (unsigned long) qout_old->segend; | |
284 | qout->segcnt = qout_old->segcnt; | |
285 | qout->segrcnt = qout_old->segrcnt; | |
286 | ||
287 | if (qout->segcnt > 6) | |
288 | qout->segrcnt = 6; | |
289 | for (i = 0; i < qout->segrcnt; i++) { | |
290 | qout->range[i].start = | |
291 | (unsigned long) qout_old->range[i].start; | |
292 | qout->range[i].end = | |
293 | (unsigned long) qout_old->range[i].end; | |
294 | } | |
295 | kfree(qout_old); | |
296 | } | |
1da177e4 | 297 | if (qout->segcnt > 6) { |
b8e660b8 | 298 | rc = -EOPNOTSUPP; |
1da177e4 LT |
299 | goto out_free; |
300 | } | |
301 | ||
302 | if (qout->segcnt == 1) { | |
303 | seg->vm_segtype = qout->range[0].start & 0xff; | |
304 | } else { | |
305 | /* multi-part segment. only one type supported here: | |
306 | - all parts are contiguous | |
307 | - all parts are either EW or EN type | |
308 | - maximum 6 parts allowed */ | |
309 | unsigned long start = qout->segstart >> PAGE_SHIFT; | |
310 | for (i=0; i<qout->segcnt; i++) { | |
311 | if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) && | |
312 | ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) { | |
b8e660b8 | 313 | rc = -EOPNOTSUPP; |
1da177e4 LT |
314 | goto out_free; |
315 | } | |
316 | if (start != qout->range[i].start >> PAGE_SHIFT) { | |
b8e660b8 | 317 | rc = -EOPNOTSUPP; |
1da177e4 LT |
318 | goto out_free; |
319 | } | |
320 | start = (qout->range[i].end >> PAGE_SHIFT) + 1; | |
321 | } | |
322 | seg->vm_segtype = SEG_TYPE_EWEN; | |
323 | } | |
324 | ||
325 | /* analyze diag output and update seg */ | |
326 | seg->start_addr = qout->segstart; | |
327 | seg->end = qout->segend; | |
328 | ||
329 | memcpy (seg->range, qout->range, 6*sizeof(struct qrange)); | |
330 | seg->segcnt = qout->segcnt; | |
331 | ||
332 | rc = 0; | |
333 | ||
334 | out_free: | |
b2325fe1 JJ |
335 | kfree(qin); |
336 | kfree(qout); | |
1da177e4 LT |
337 | return rc; |
338 | } | |
339 | ||
1da177e4 LT |
340 | /* |
341 | * get info about a segment | |
342 | * possible return values: | |
343 | * -ENOSYS : we are not running on VM | |
344 | * -EIO : could not perform query diagnose | |
345 | * -ENOENT : no such segment | |
b8e660b8 | 346 | * -EOPNOTSUPP: multi-part segment cannot be used with linux |
1da177e4 LT |
347 | * -ENOMEM : out of memory |
348 | * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h | |
349 | */ | |
350 | int | |
351 | segment_type (char* name) | |
352 | { | |
353 | int rc; | |
354 | struct dcss_segment seg; | |
355 | ||
356 | if (!MACHINE_IS_VM) | |
357 | return -ENOSYS; | |
358 | ||
359 | dcss_mkname(name, seg.dcss_name); | |
360 | rc = query_segment_type (&seg); | |
361 | if (rc < 0) | |
362 | return rc; | |
363 | return seg.vm_segtype; | |
364 | } | |
365 | ||
b2300b9e HY |
366 | /* |
367 | * check if segment collides with other segments that are currently loaded | |
368 | * returns 1 if this is the case, 0 if no collision was found | |
369 | */ | |
370 | static int | |
371 | segment_overlaps_others (struct dcss_segment *seg) | |
372 | { | |
373 | struct list_head *l; | |
374 | struct dcss_segment *tmp; | |
375 | ||
376 | BUG_ON(!mutex_is_locked(&dcss_lock)); | |
377 | list_for_each(l, &dcss_list) { | |
378 | tmp = list_entry(l, struct dcss_segment, list); | |
379 | if ((tmp->start_addr >> 20) > (seg->end >> 20)) | |
380 | continue; | |
381 | if ((tmp->end >> 20) < (seg->start_addr >> 20)) | |
382 | continue; | |
383 | if (seg == tmp) | |
384 | continue; | |
385 | return 1; | |
386 | } | |
387 | return 0; | |
388 | } | |
389 | ||
1da177e4 LT |
390 | /* |
391 | * real segment loading function, called from segment_load | |
392 | */ | |
393 | static int | |
394 | __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end) | |
395 | { | |
b2300b9e | 396 | unsigned long start_addr, end_addr, dummy; |
c2f0e8c8 HC |
397 | struct dcss_segment *seg; |
398 | int rc, diag_cc; | |
1da177e4 | 399 | |
89db4df1 | 400 | start_addr = end_addr = 0; |
c2f0e8c8 | 401 | seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
402 | if (seg == NULL) { |
403 | rc = -ENOMEM; | |
404 | goto out; | |
405 | } | |
406 | dcss_mkname (name, seg->dcss_name); | |
407 | rc = query_segment_type (seg); | |
408 | if (rc < 0) | |
409 | goto out_free; | |
f4eb07c1 | 410 | |
b2300b9e HY |
411 | if (loadshr_scode == DCSS_LOADSHRX) { |
412 | if (segment_overlaps_others(seg)) { | |
413 | rc = -EBUSY; | |
414 | goto out_free; | |
415 | } | |
416 | } | |
417 | ||
17f34580 | 418 | rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
f4eb07c1 | 419 | |
ca68305b | 420 | if (rc) |
1da177e4 | 421 | goto out_free; |
f4eb07c1 | 422 | |
444f0e54 GS |
423 | seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
424 | if (seg->res == NULL) { | |
425 | rc = -ENOMEM; | |
426 | goto out_shared; | |
427 | } | |
428 | seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; | |
429 | seg->res->start = seg->start_addr; | |
430 | seg->res->end = seg->end; | |
431 | memcpy(&seg->res_name, seg->dcss_name, 8); | |
432 | EBCASC(seg->res_name, 8); | |
433 | seg->res_name[8] = '\0'; | |
434 | strncat(seg->res_name, " (DCSS)", 7); | |
435 | seg->res->name = seg->res_name; | |
436 | rc = seg->vm_segtype; | |
437 | if (rc == SEG_TYPE_SC || | |
438 | ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared)) | |
439 | seg->res->flags |= IORESOURCE_READONLY; | |
440 | if (request_resource(&iomem_resource, seg->res)) { | |
441 | rc = -EBUSY; | |
442 | kfree(seg->res); | |
443 | goto out_shared; | |
444 | } | |
445 | ||
1da177e4 | 446 | if (do_nonshared) |
b2300b9e HY |
447 | diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name, |
448 | &start_addr, &end_addr); | |
1da177e4 | 449 | else |
b2300b9e HY |
450 | diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name, |
451 | &start_addr, &end_addr); | |
452 | if (diag_cc < 0) { | |
453 | dcss_diag(&purgeseg_scode, seg->dcss_name, | |
454 | &dummy, &dummy); | |
455 | rc = diag_cc; | |
456 | goto out_resource; | |
457 | } | |
1da177e4 | 458 | if (diag_cc > 1) { |
93098bf0 HY |
459 | pr_warning("Loading DCSS %s failed with rc=%ld\n", name, |
460 | end_addr); | |
b2300b9e HY |
461 | rc = dcss_diag_translate_rc(end_addr); |
462 | dcss_diag(&purgeseg_scode, seg->dcss_name, | |
463 | &dummy, &dummy); | |
444f0e54 | 464 | goto out_resource; |
1da177e4 | 465 | } |
b2300b9e HY |
466 | seg->start_addr = start_addr; |
467 | seg->end = end_addr; | |
1da177e4 LT |
468 | seg->do_nonshared = do_nonshared; |
469 | atomic_set(&seg->ref_count, 1); | |
470 | list_add(&seg->list, &dcss_list); | |
1da177e4 LT |
471 | *addr = seg->start_addr; |
472 | *end = seg->end; | |
473 | if (do_nonshared) | |
93098bf0 HY |
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]); | |
444f0e54 | 477 | else { |
93098bf0 HY |
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]); | |
444f0e54 | 481 | } |
1da177e4 | 482 | goto out; |
444f0e54 GS |
483 | out_resource: |
484 | release_resource(seg->res); | |
485 | kfree(seg->res); | |
f4eb07c1 | 486 | out_shared: |
17f34580 | 487 | vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
1da177e4 | 488 | out_free: |
b2325fe1 | 489 | kfree(seg); |
1da177e4 LT |
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 | |
b8e660b8 | 505 | * -EOPNOTSUPP: multi-part segment cannot be used with linux |
1da177e4 LT |
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 | ||
09252e77 | 523 | mutex_lock(&dcss_lock); |
1da177e4 LT |
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 | } | |
09252e77 | 538 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
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 | |
444f0e54 | 552 | * -EBUSY : segment can temporarily not be used (overlaps with dcss) |
1da177e4 LT |
553 | * 0 : operation succeeded |
554 | */ | |
555 | int | |
556 | segment_modify_shared (char *name, int do_nonshared) | |
557 | { | |
558 | struct dcss_segment *seg; | |
b2300b9e HY |
559 | unsigned long start_addr, end_addr, dummy; |
560 | int rc, diag_cc; | |
1da177e4 | 561 | |
89db4df1 | 562 | start_addr = end_addr = 0; |
09252e77 | 563 | mutex_lock(&dcss_lock); |
1da177e4 LT |
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) { | |
93098bf0 HY |
570 | pr_info("DCSS %s is already in the requested access " |
571 | "mode\n", name); | |
1da177e4 LT |
572 | rc = 0; |
573 | goto out_unlock; | |
574 | } | |
575 | if (atomic_read (&seg->ref_count) != 1) { | |
93098bf0 HY |
576 | pr_warning("DCSS %s is in use and cannot be reloaded\n", |
577 | name); | |
1da177e4 LT |
578 | rc = -EAGAIN; |
579 | goto out_unlock; | |
580 | } | |
444f0e54 | 581 | release_resource(seg->res); |
b2300b9e | 582 | if (do_nonshared) |
444f0e54 | 583 | seg->res->flags &= ~IORESOURCE_READONLY; |
b2300b9e | 584 | else |
444f0e54 GS |
585 | if (seg->vm_segtype == SEG_TYPE_SR || |
586 | seg->vm_segtype == SEG_TYPE_ER) | |
587 | seg->res->flags |= IORESOURCE_READONLY; | |
b2300b9e | 588 | |
444f0e54 | 589 | if (request_resource(&iomem_resource, seg->res)) { |
93098bf0 HY |
590 | pr_warning("DCSS %s overlaps with used memory resources " |
591 | "and cannot be reloaded\n", name); | |
444f0e54 GS |
592 | rc = -EBUSY; |
593 | kfree(seg->res); | |
b2300b9e HY |
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; | |
444f0e54 | 607 | } |
1da177e4 | 608 | if (diag_cc > 1) { |
93098bf0 HY |
609 | pr_warning("Reloading DCSS %s failed with rc=%ld\n", name, |
610 | end_addr); | |
b2300b9e HY |
611 | rc = dcss_diag_translate_rc(end_addr); |
612 | goto out_del_res; | |
1da177e4 | 613 | } |
b2300b9e HY |
614 | seg->start_addr = start_addr; |
615 | seg->end = end_addr; | |
1da177e4 LT |
616 | seg->do_nonshared = do_nonshared; |
617 | rc = 0; | |
618 | goto out_unlock; | |
b2300b9e HY |
619 | out_del_res: |
620 | release_resource(seg->res); | |
621 | kfree(seg->res); | |
622 | out_del_mem: | |
17f34580 | 623 | vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
1da177e4 | 624 | list_del(&seg->list); |
b2300b9e | 625 | dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
b2325fe1 | 626 | kfree(seg); |
1da177e4 | 627 | out_unlock: |
09252e77 | 628 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
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 | ||
09252e77 | 646 | mutex_lock(&dcss_lock); |
1da177e4 LT |
647 | seg = segment_by_name (name); |
648 | if (seg == NULL) { | |
93098bf0 | 649 | pr_err("Unloading unknown DCSS %s failed\n", name); |
1da177e4 LT |
650 | goto out_unlock; |
651 | } | |
f4eb07c1 HC |
652 | if (atomic_dec_return(&seg->ref_count) != 0) |
653 | goto out_unlock; | |
444f0e54 GS |
654 | release_resource(seg->res); |
655 | kfree(seg->res); | |
17f34580 | 656 | vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
f4eb07c1 | 657 | list_del(&seg->list); |
b2300b9e | 658 | dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
f4eb07c1 | 659 | kfree(seg); |
1da177e4 | 660 | out_unlock: |
09252e77 | 661 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
662 | } |
663 | ||
664 | /* | |
665 | * save segment content permanently | |
666 | */ | |
667 | void | |
668 | segment_save(char *name) | |
669 | { | |
670 | struct dcss_segment *seg; | |
1da177e4 LT |
671 | char cmd1[160]; |
672 | char cmd2[80]; | |
9b5dec1a | 673 | int i, response; |
1da177e4 LT |
674 | |
675 | if (!MACHINE_IS_VM) | |
676 | return; | |
677 | ||
09252e77 | 678 | mutex_lock(&dcss_lock); |
1da177e4 LT |
679 | seg = segment_by_name (name); |
680 | ||
681 | if (seg == NULL) { | |
93098bf0 | 682 | pr_err("Saving unknown DCSS %s failed\n", name); |
6b4044bd | 683 | goto out; |
1da177e4 LT |
684 | } |
685 | ||
1da177e4 LT |
686 | sprintf(cmd1, "DEFSEG %s", name); |
687 | for (i=0; i<seg->segcnt; i++) { | |
b2300b9e | 688 | sprintf(cmd1+strlen(cmd1), " %lX-%lX %s", |
1da177e4 LT |
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); | |
9b5dec1a GS |
694 | response = 0; |
695 | cpcmd(cmd1, NULL, 0, &response); | |
696 | if (response) { | |
93098bf0 HY |
697 | pr_err("Saving a DCSS failed with DEFSEG response code " |
698 | "%i\n", response); | |
9b5dec1a GS |
699 | goto out; |
700 | } | |
701 | cpcmd(cmd2, NULL, 0, &response); | |
702 | if (response) { | |
93098bf0 HY |
703 | pr_err("Saving a DCSS failed with SAVESEG response code " |
704 | "%i\n", response); | |
9b5dec1a GS |
705 | goto out; |
706 | } | |
707 | out: | |
09252e77 | 708 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
709 | } |
710 | ||
ca68305b MS |
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: | |
93098bf0 | 719 | pr_err("DCSS %s cannot be loaded or queried\n", seg_name); |
ca68305b MS |
720 | break; |
721 | case -ENOSYS: | |
93098bf0 HY |
722 | pr_err("DCSS %s cannot be loaded or queried without " |
723 | "z/VM\n", seg_name); | |
ca68305b MS |
724 | break; |
725 | case -EIO: | |
93098bf0 HY |
726 | pr_err("Loading or querying DCSS %s resulted in a " |
727 | "hardware error\n", seg_name); | |
ca68305b | 728 | break; |
b8e660b8 | 729 | case -EOPNOTSUPP: |
93098bf0 HY |
730 | pr_err("DCSS %s has multiple page ranges and cannot be " |
731 | "loaded or queried\n", seg_name); | |
ca68305b MS |
732 | break; |
733 | case -ENOSPC: | |
93098bf0 HY |
734 | pr_err("DCSS %s overlaps with used storage and cannot " |
735 | "be loaded\n", seg_name); | |
ca68305b MS |
736 | break; |
737 | case -EBUSY: | |
93098bf0 HY |
738 | pr_err("%s needs used memory resources and cannot be " |
739 | "loaded or queried\n", seg_name); | |
ca68305b MS |
740 | break; |
741 | case -EPERM: | |
93098bf0 HY |
742 | pr_err("DCSS %s is already loaded in a different access " |
743 | "mode\n", seg_name); | |
ca68305b MS |
744 | break; |
745 | case -ENOMEM: | |
93098bf0 HY |
746 | pr_err("There is not enough memory to load or query " |
747 | "DCSS %s\n", seg_name); | |
ca68305b MS |
748 | break; |
749 | case -ERANGE: | |
93098bf0 HY |
750 | pr_err("DCSS %s exceeds the kernel mapping range (%lu) " |
751 | "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS); | |
ca68305b MS |
752 | break; |
753 | default: | |
ca68305b MS |
754 | break; |
755 | } | |
756 | } | |
757 | ||
1da177e4 LT |
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); | |
ca68305b | 763 | EXPORT_SYMBOL(segment_warning); |