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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> | |
ff24b07a | 17 | #include <linux/export.h> |
1da177e4 | 18 | #include <linux/bootmem.h> |
36a2bd42 | 19 | #include <linux/ctype.h> |
444f0e54 | 20 | #include <linux/ioport.h> |
1ec2772e | 21 | #include <asm/diag.h> |
1da177e4 | 22 | #include <asm/page.h> |
f4eb07c1 | 23 | #include <asm/pgtable.h> |
1da177e4 LT |
24 | #include <asm/ebcdic.h> |
25 | #include <asm/errno.h> | |
26 | #include <asm/extmem.h> | |
27 | #include <asm/cpcmd.h> | |
36a2bd42 | 28 | #include <asm/setup.h> |
1da177e4 | 29 | |
1da177e4 LT |
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 | |
b2300b9e HY |
36 | #define DCSS_LOADSHRX 0x20 |
37 | #define DCSS_LOADNSRX 0x24 | |
38 | #define DCSS_FINDSEGX 0x2c | |
39 | #define DCSS_SEGEXTX 0x38 | |
1da177e4 LT |
40 | #define DCSS_FINDSEGA 0x0c |
41 | ||
42 | struct qrange { | |
b2300b9e HY |
43 | unsigned long start; /* last byte type */ |
44 | unsigned long end; /* last byte reserved */ | |
1da177e4 LT |
45 | }; |
46 | ||
47 | struct qout64 { | |
b2300b9e HY |
48 | unsigned long segstart; |
49 | unsigned long segend; | |
50 | int segcnt; | |
51 | int segrcnt; | |
52 | struct qrange range[6]; | |
53 | }; | |
54 | ||
b2300b9e HY |
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 LT |
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]; | |
444f0e54 | 82 | char res_name[15]; |
1da177e4 LT |
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; | |
444f0e54 | 90 | struct resource *res; |
1da177e4 LT |
91 | }; |
92 | ||
09252e77 | 93 | static DEFINE_MUTEX(dcss_lock); |
c11ca97e | 94 | static LIST_HEAD(dcss_list); |
1da177e4 LT |
95 | static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC", |
96 | "EW/EN-MIXED" }; | |
90f405e8 | 97 | static int loadshr_scode, loadnsr_scode; |
b2300b9e HY |
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 | { | |
c2f0e8c8 | 105 | char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA); |
b2300b9e HY |
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"); | |
1ec2772e | 116 | diag_stat_inc(DIAG_STAT_X064); |
b2300b9e HY |
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) | |
f1c7ea26 | 125 | : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc", "memory"); |
b2300b9e HY |
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; | |
b2300b9e HY |
133 | segext_scode = DCSS_SEGEXTX; |
134 | return 0; | |
135 | } | |
b2300b9e HY |
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; | |
b2300b9e HY |
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]); | |
0b925159 | 157 | } |
1da177e4 LT |
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 | 207 | /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */ |
1ec2772e | 208 | diag_stat_inc(DIAG_STAT_X064); |
b2300b9e HY |
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"); | |
1da177e4 LT |
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 | { | |
1da177e4 | 243 | unsigned long dummy, vmrc; |
c2f0e8c8 HC |
244 | int diag_cc, rc, i; |
245 | struct qout64 *qout; | |
246 | struct qin64 *qin; | |
1da177e4 | 247 | |
c2f0e8c8 HC |
248 | qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA); |
249 | qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA); | |
1da177e4 LT |
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 | ||
b2300b9e | 261 | diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc); |
1da177e4 | 262 | |
b2300b9e HY |
263 | if (diag_cc < 0) { |
264 | rc = diag_cc; | |
265 | goto out_free; | |
266 | } | |
1da177e4 | 267 | if (diag_cc > 1) { |
baebc70a | 268 | pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc); |
1da177e4 LT |
269 | rc = dcss_diag_translate_rc (vmrc); |
270 | goto out_free; | |
271 | } | |
272 | ||
b2300b9e HY |
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; | |
c2f0e8c8 | 277 | qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA); |
b2300b9e HY |
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 | } | |
1da177e4 | 298 | if (qout->segcnt > 6) { |
b8e660b8 | 299 | rc = -EOPNOTSUPP; |
1da177e4 LT |
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)) { | |
b8e660b8 | 314 | rc = -EOPNOTSUPP; |
1da177e4 LT |
315 | goto out_free; |
316 | } | |
317 | if (start != qout->range[i].start >> PAGE_SHIFT) { | |
b8e660b8 | 318 | rc = -EOPNOTSUPP; |
1da177e4 LT |
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: | |
b2325fe1 JJ |
336 | kfree(qin); |
337 | kfree(qout); | |
1da177e4 LT |
338 | return rc; |
339 | } | |
340 | ||
1da177e4 LT |
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 | |
b8e660b8 | 347 | * -EOPNOTSUPP: multi-part segment cannot be used with linux |
1da177e4 LT |
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 | ||
b2300b9e HY |
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 | ||
1da177e4 LT |
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 | { | |
b2300b9e | 397 | unsigned long start_addr, end_addr, dummy; |
c2f0e8c8 HC |
398 | struct dcss_segment *seg; |
399 | int rc, diag_cc; | |
1da177e4 | 400 | |
89db4df1 | 401 | start_addr = end_addr = 0; |
c2f0e8c8 | 402 | seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
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; | |
f4eb07c1 | 411 | |
b2300b9e HY |
412 | if (loadshr_scode == DCSS_LOADSHRX) { |
413 | if (segment_overlaps_others(seg)) { | |
414 | rc = -EBUSY; | |
415 | goto out_free; | |
416 | } | |
417 | } | |
418 | ||
17f34580 | 419 | rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
f4eb07c1 | 420 | |
ca68305b | 421 | if (rc) |
1da177e4 | 422 | goto out_free; |
f4eb07c1 | 423 | |
444f0e54 GS |
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 | ||
1da177e4 | 447 | if (do_nonshared) |
b2300b9e HY |
448 | diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name, |
449 | &start_addr, &end_addr); | |
1da177e4 | 450 | else |
b2300b9e HY |
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 | } | |
1da177e4 | 459 | if (diag_cc > 1) { |
baebc70a | 460 | pr_warn("Loading DCSS %s failed with rc=%ld\n", name, 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) { | |
baebc70a | 576 | pr_warn("DCSS %s is in use and cannot be reloaded\n", name); |
1da177e4 LT |
577 | rc = -EAGAIN; |
578 | goto out_unlock; | |
579 | } | |
444f0e54 | 580 | release_resource(seg->res); |
b2300b9e | 581 | if (do_nonshared) |
444f0e54 | 582 | seg->res->flags &= ~IORESOURCE_READONLY; |
b2300b9e | 583 | else |
444f0e54 GS |
584 | if (seg->vm_segtype == SEG_TYPE_SR || |
585 | seg->vm_segtype == SEG_TYPE_ER) | |
586 | seg->res->flags |= IORESOURCE_READONLY; | |
b2300b9e | 587 | |
444f0e54 | 588 | if (request_resource(&iomem_resource, seg->res)) { |
baebc70a JP |
589 | pr_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n", |
590 | name); | |
444f0e54 GS |
591 | rc = -EBUSY; |
592 | kfree(seg->res); | |
b2300b9e HY |
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; | |
444f0e54 | 606 | } |
1da177e4 | 607 | if (diag_cc > 1) { |
baebc70a JP |
608 | pr_warn("Reloading DCSS %s failed with rc=%ld\n", |
609 | name, end_addr); | |
b2300b9e HY |
610 | rc = dcss_diag_translate_rc(end_addr); |
611 | goto out_del_res; | |
1da177e4 | 612 | } |
b2300b9e HY |
613 | seg->start_addr = start_addr; |
614 | seg->end = end_addr; | |
1da177e4 LT |
615 | seg->do_nonshared = do_nonshared; |
616 | rc = 0; | |
617 | goto out_unlock; | |
b2300b9e HY |
618 | out_del_res: |
619 | release_resource(seg->res); | |
620 | kfree(seg->res); | |
621 | out_del_mem: | |
17f34580 | 622 | vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
1da177e4 | 623 | list_del(&seg->list); |
b2300b9e | 624 | dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
b2325fe1 | 625 | kfree(seg); |
1da177e4 | 626 | out_unlock: |
09252e77 | 627 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
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 | ||
09252e77 | 645 | mutex_lock(&dcss_lock); |
1da177e4 LT |
646 | seg = segment_by_name (name); |
647 | if (seg == NULL) { | |
93098bf0 | 648 | pr_err("Unloading unknown DCSS %s failed\n", name); |
1da177e4 LT |
649 | goto out_unlock; |
650 | } | |
f4eb07c1 HC |
651 | if (atomic_dec_return(&seg->ref_count) != 0) |
652 | goto out_unlock; | |
444f0e54 GS |
653 | release_resource(seg->res); |
654 | kfree(seg->res); | |
17f34580 | 655 | vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
f4eb07c1 | 656 | list_del(&seg->list); |
b2300b9e | 657 | dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
f4eb07c1 | 658 | kfree(seg); |
1da177e4 | 659 | out_unlock: |
09252e77 | 660 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
661 | } |
662 | ||
663 | /* | |
664 | * save segment content permanently | |
665 | */ | |
666 | void | |
667 | segment_save(char *name) | |
668 | { | |
669 | struct dcss_segment *seg; | |
1da177e4 LT |
670 | char cmd1[160]; |
671 | char cmd2[80]; | |
9b5dec1a | 672 | int i, response; |
1da177e4 LT |
673 | |
674 | if (!MACHINE_IS_VM) | |
675 | return; | |
676 | ||
09252e77 | 677 | mutex_lock(&dcss_lock); |
1da177e4 LT |
678 | seg = segment_by_name (name); |
679 | ||
680 | if (seg == NULL) { | |
93098bf0 | 681 | pr_err("Saving unknown DCSS %s failed\n", name); |
6b4044bd | 682 | goto out; |
1da177e4 LT |
683 | } |
684 | ||
1da177e4 LT |
685 | sprintf(cmd1, "DEFSEG %s", name); |
686 | for (i=0; i<seg->segcnt; i++) { | |
b2300b9e | 687 | sprintf(cmd1+strlen(cmd1), " %lX-%lX %s", |
1da177e4 LT |
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); | |
9b5dec1a GS |
693 | response = 0; |
694 | cpcmd(cmd1, NULL, 0, &response); | |
695 | if (response) { | |
93098bf0 HY |
696 | pr_err("Saving a DCSS failed with DEFSEG response code " |
697 | "%i\n", response); | |
9b5dec1a GS |
698 | goto out; |
699 | } | |
700 | cpcmd(cmd2, NULL, 0, &response); | |
701 | if (response) { | |
93098bf0 HY |
702 | pr_err("Saving a DCSS failed with SAVESEG response code " |
703 | "%i\n", response); | |
9b5dec1a GS |
704 | goto out; |
705 | } | |
706 | out: | |
09252e77 | 707 | mutex_unlock(&dcss_lock); |
1da177e4 LT |
708 | } |
709 | ||
ca68305b MS |
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: | |
93098bf0 | 718 | pr_err("DCSS %s cannot be loaded or queried\n", seg_name); |
ca68305b MS |
719 | break; |
720 | case -ENOSYS: | |
93098bf0 HY |
721 | pr_err("DCSS %s cannot be loaded or queried without " |
722 | "z/VM\n", seg_name); | |
ca68305b MS |
723 | break; |
724 | case -EIO: | |
93098bf0 HY |
725 | pr_err("Loading or querying DCSS %s resulted in a " |
726 | "hardware error\n", seg_name); | |
ca68305b | 727 | break; |
b8e660b8 | 728 | case -EOPNOTSUPP: |
93098bf0 HY |
729 | pr_err("DCSS %s has multiple page ranges and cannot be " |
730 | "loaded or queried\n", seg_name); | |
ca68305b MS |
731 | break; |
732 | case -ENOSPC: | |
93098bf0 HY |
733 | pr_err("DCSS %s overlaps with used storage and cannot " |
734 | "be loaded\n", seg_name); | |
ca68305b MS |
735 | break; |
736 | case -EBUSY: | |
93098bf0 HY |
737 | pr_err("%s needs used memory resources and cannot be " |
738 | "loaded or queried\n", seg_name); | |
ca68305b MS |
739 | break; |
740 | case -EPERM: | |
93098bf0 HY |
741 | pr_err("DCSS %s is already loaded in a different access " |
742 | "mode\n", seg_name); | |
ca68305b MS |
743 | break; |
744 | case -ENOMEM: | |
93098bf0 HY |
745 | pr_err("There is not enough memory to load or query " |
746 | "DCSS %s\n", seg_name); | |
ca68305b MS |
747 | break; |
748 | case -ERANGE: | |
93098bf0 HY |
749 | pr_err("DCSS %s exceeds the kernel mapping range (%lu) " |
750 | "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS); | |
ca68305b MS |
751 | break; |
752 | default: | |
ca68305b MS |
753 | break; |
754 | } | |
755 | } | |
756 | ||
1da177e4 LT |
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); | |
ca68305b | 762 | EXPORT_SYMBOL(segment_warning); |