Commit | Line | Data |
---|---|---|
411ed322 MH |
1 | /* |
2 | * zcore module to export memory content and register sets for creating system | |
3 | * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same | |
4 | * dump format as s390 standalone dumps. | |
5 | * | |
6 | * For more information please refer to Documentation/s390/zfcpdump.txt | |
7 | * | |
a53c8fab | 8 | * Copyright IBM Corp. 2003, 2008 |
411ed322 MH |
9 | * Author(s): Michael Holzheu |
10 | */ | |
11 | ||
17159dc6 MH |
12 | #define KMSG_COMPONENT "zdump" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
411ed322 | 15 | #include <linux/init.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
411ed322 | 17 | #include <linux/miscdevice.h> |
411ed322 | 18 | #include <linux/debugfs.h> |
3948a102 | 19 | #include <linux/module.h> |
cbb870c8 | 20 | #include <asm/asm-offsets.h> |
411ed322 MH |
21 | #include <asm/ipl.h> |
22 | #include <asm/sclp.h> | |
23 | #include <asm/setup.h> | |
411ed322 MH |
24 | #include <asm/uaccess.h> |
25 | #include <asm/debug.h> | |
26 | #include <asm/processor.h> | |
27 | #include <asm/irqflags.h> | |
159d1ff8 | 28 | #include <asm/checksum.h> |
763968e2 | 29 | #include "sclp.h" |
411ed322 MH |
30 | |
31 | #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) | |
411ed322 MH |
32 | |
33 | #define TO_USER 0 | |
34 | #define TO_KERNEL 1 | |
12e0c95e | 35 | #define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ |
411ed322 MH |
36 | |
37 | enum arch_id { | |
38 | ARCH_S390 = 0, | |
39 | ARCH_S390X = 1, | |
40 | }; | |
41 | ||
42 | /* dump system info */ | |
43 | ||
44 | struct sys_info { | |
f64ca217 HC |
45 | enum arch_id arch; |
46 | unsigned long sa_base; | |
47 | u32 sa_size; | |
48 | int cpu_map[NR_CPUS]; | |
49 | unsigned long mem_size; | |
50 | struct save_area lc_mask; | |
411ed322 MH |
51 | }; |
52 | ||
099b7651 FM |
53 | struct ipib_info { |
54 | unsigned long ipib; | |
55 | u32 checksum; | |
56 | } __attribute__((packed)); | |
57 | ||
411ed322 MH |
58 | static struct sys_info sys_info; |
59 | static struct debug_info *zcore_dbf; | |
60 | static int hsa_available; | |
61 | static struct dentry *zcore_dir; | |
62 | static struct dentry *zcore_file; | |
12e0c95e | 63 | static struct dentry *zcore_memmap_file; |
099b7651 | 64 | static struct dentry *zcore_reipl_file; |
b4b3d128 | 65 | static struct dentry *zcore_hsa_file; |
099b7651 | 66 | static struct ipl_parameter_block *ipl_block; |
411ed322 MH |
67 | |
68 | /* | |
69 | * Copy memory from HSA to kernel or user memory (not reentrant): | |
70 | * | |
71 | * @dest: Kernel or user buffer where memory should be copied to | |
72 | * @src: Start address within HSA where data should be copied | |
73 | * @count: Size of buffer, which should be copied | |
74 | * @mode: Either TO_KERNEL or TO_USER | |
75 | */ | |
76 | static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode) | |
77 | { | |
78 | int offs, blk_num; | |
79 | static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
80 | ||
b4b3d128 MH |
81 | if (!hsa_available) |
82 | return -ENODATA; | |
411ed322 MH |
83 | if (count == 0) |
84 | return 0; | |
85 | ||
86 | /* copy first block */ | |
87 | offs = 0; | |
88 | if ((src % PAGE_SIZE) != 0) { | |
89 | blk_num = src / PAGE_SIZE + 2; | |
90 | if (sclp_sdias_copy(buf, blk_num, 1)) { | |
91 | TRACE("sclp_sdias_copy() failed\n"); | |
92 | return -EIO; | |
93 | } | |
94 | offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count); | |
95 | if (mode == TO_USER) { | |
96 | if (copy_to_user((__force __user void*) dest, | |
97 | buf + (src % PAGE_SIZE), offs)) | |
98 | return -EFAULT; | |
99 | } else | |
100 | memcpy(dest, buf + (src % PAGE_SIZE), offs); | |
101 | } | |
102 | if (offs == count) | |
103 | goto out; | |
104 | ||
105 | /* copy middle */ | |
106 | for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) { | |
107 | blk_num = (src + offs) / PAGE_SIZE + 2; | |
108 | if (sclp_sdias_copy(buf, blk_num, 1)) { | |
109 | TRACE("sclp_sdias_copy() failed\n"); | |
110 | return -EIO; | |
111 | } | |
112 | if (mode == TO_USER) { | |
113 | if (copy_to_user((__force __user void*) dest + offs, | |
114 | buf, PAGE_SIZE)) | |
115 | return -EFAULT; | |
116 | } else | |
117 | memcpy(dest + offs, buf, PAGE_SIZE); | |
118 | } | |
119 | if (offs == count) | |
120 | goto out; | |
121 | ||
122 | /* copy last block */ | |
123 | blk_num = (src + offs) / PAGE_SIZE + 2; | |
124 | if (sclp_sdias_copy(buf, blk_num, 1)) { | |
125 | TRACE("sclp_sdias_copy() failed\n"); | |
126 | return -EIO; | |
127 | } | |
128 | if (mode == TO_USER) { | |
129 | if (copy_to_user((__force __user void*) dest + offs, buf, | |
130 | PAGE_SIZE)) | |
131 | return -EFAULT; | |
132 | } else | |
133 | memcpy(dest + offs, buf, count - offs); | |
134 | out: | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) | |
139 | { | |
140 | return memcpy_hsa((void __force *) dest, src, count, TO_USER); | |
141 | } | |
142 | ||
143 | static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) | |
144 | { | |
145 | return memcpy_hsa(dest, src, count, TO_KERNEL); | |
146 | } | |
147 | ||
411ed322 MH |
148 | static int __init init_cpu_info(enum arch_id arch) |
149 | { | |
f64ca217 | 150 | struct save_area *sa; |
411ed322 MH |
151 | |
152 | /* get info for boot cpu from lowcore, stored in the HSA */ | |
153 | ||
154 | sa = kmalloc(sizeof(*sa), GFP_KERNEL); | |
2a062ab4 | 155 | if (!sa) |
411ed322 | 156 | return -ENOMEM; |
411ed322 | 157 | if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) { |
2a062ab4 | 158 | TRACE("could not copy from HSA\n"); |
411ed322 MH |
159 | kfree(sa); |
160 | return -EIO; | |
161 | } | |
162 | zfcpdump_save_areas[0] = sa; | |
411ed322 MH |
163 | return 0; |
164 | } | |
165 | ||
166 | static DEFINE_MUTEX(zcore_mutex); | |
167 | ||
0cbde8ee | 168 | #define DUMP_VERSION 0x5 |
411ed322 MH |
169 | #define DUMP_MAGIC 0xa8190173618f23fdULL |
170 | #define DUMP_ARCH_S390X 2 | |
171 | #define DUMP_ARCH_S390 1 | |
172 | #define HEADER_SIZE 4096 | |
173 | ||
174 | /* dump header dumped according to s390 crash dump format */ | |
175 | ||
176 | struct zcore_header { | |
177 | u64 magic; | |
178 | u32 version; | |
179 | u32 header_size; | |
180 | u32 dump_level; | |
181 | u32 page_size; | |
182 | u64 mem_size; | |
183 | u64 mem_start; | |
184 | u64 mem_end; | |
185 | u32 num_pages; | |
186 | u32 pad1; | |
187 | u64 tod; | |
e86a6ed6 | 188 | struct cpuid cpu_id; |
411ed322 | 189 | u32 arch_id; |
ce444823 | 190 | u32 volnr; |
411ed322 | 191 | u32 build_arch; |
ce444823 | 192 | u64 rmem_size; |
0cbde8ee MH |
193 | u8 mvdump; |
194 | u16 cpu_cnt; | |
195 | u16 real_cpu_cnt; | |
196 | u8 end_pad1[0x200-0x061]; | |
197 | u64 mvdump_sign; | |
198 | u64 mvdump_zipl_time; | |
199 | u8 end_pad2[0x800-0x210]; | |
200 | u32 lc_vec[512]; | |
411ed322 MH |
201 | } __attribute__((packed,__aligned__(16))); |
202 | ||
203 | static struct zcore_header zcore_header = { | |
204 | .magic = DUMP_MAGIC, | |
205 | .version = DUMP_VERSION, | |
206 | .header_size = 4096, | |
207 | .dump_level = 0, | |
208 | .page_size = PAGE_SIZE, | |
209 | .mem_start = 0, | |
f64ca217 | 210 | #ifdef CONFIG_64BIT |
411ed322 MH |
211 | .build_arch = DUMP_ARCH_S390X, |
212 | #else | |
213 | .build_arch = DUMP_ARCH_S390, | |
214 | #endif | |
215 | }; | |
216 | ||
217 | /* | |
218 | * Copy lowcore info to buffer. Use map in order to copy only register parts. | |
219 | * | |
220 | * @buf: User buffer | |
221 | * @sa: Pointer to save area | |
222 | * @sa_off: Offset in save area to copy | |
223 | * @len: Number of bytes to copy | |
224 | */ | |
225 | static int copy_lc(void __user *buf, void *sa, int sa_off, int len) | |
226 | { | |
227 | int i; | |
228 | char *lc_mask = (char*)&sys_info.lc_mask; | |
229 | ||
230 | for (i = 0; i < len; i++) { | |
231 | if (!lc_mask[i + sa_off]) | |
232 | continue; | |
233 | if (copy_to_user(buf + i, sa + sa_off + i, 1)) | |
234 | return -EFAULT; | |
235 | } | |
236 | return 0; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Copy lowcores info to memory, if necessary | |
241 | * | |
242 | * @buf: User buffer | |
243 | * @addr: Start address of buffer in dump memory | |
244 | * @count: Size of buffer | |
245 | */ | |
246 | static int zcore_add_lc(char __user *buf, unsigned long start, size_t count) | |
247 | { | |
248 | unsigned long end; | |
249 | int i = 0; | |
250 | ||
251 | if (count == 0) | |
252 | return 0; | |
253 | ||
254 | end = start + count; | |
255 | while (zfcpdump_save_areas[i]) { | |
256 | unsigned long cp_start, cp_end; /* copy range */ | |
257 | unsigned long sa_start, sa_end; /* save area range */ | |
258 | unsigned long prefix; | |
259 | unsigned long sa_off, len, buf_off; | |
260 | ||
f64ca217 | 261 | prefix = zfcpdump_save_areas[i]->pref_reg; |
411ed322 MH |
262 | sa_start = prefix + sys_info.sa_base; |
263 | sa_end = prefix + sys_info.sa_base + sys_info.sa_size; | |
264 | ||
265 | if ((end < sa_start) || (start > sa_end)) | |
266 | goto next; | |
267 | cp_start = max(start, sa_start); | |
268 | cp_end = min(end, sa_end); | |
269 | ||
270 | buf_off = cp_start - start; | |
271 | sa_off = cp_start - sa_start; | |
272 | len = cp_end - cp_start; | |
273 | ||
274 | TRACE("copy_lc for: %lx\n", start); | |
275 | if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len)) | |
276 | return -EFAULT; | |
277 | next: | |
278 | i++; | |
279 | } | |
280 | return 0; | |
281 | } | |
282 | ||
b4b3d128 MH |
283 | /* |
284 | * Release the HSA | |
285 | */ | |
286 | static void release_hsa(void) | |
287 | { | |
288 | diag308(DIAG308_REL_HSA, NULL); | |
289 | hsa_available = 0; | |
290 | } | |
291 | ||
411ed322 MH |
292 | /* |
293 | * Read routine for zcore character device | |
294 | * First 4K are dump header | |
295 | * Next 32MB are HSA Memory | |
296 | * Rest is read from absolute Memory | |
297 | */ | |
298 | static ssize_t zcore_read(struct file *file, char __user *buf, size_t count, | |
299 | loff_t *ppos) | |
300 | { | |
301 | unsigned long mem_start; /* Start address in memory */ | |
302 | size_t mem_offs; /* Offset in dump memory */ | |
303 | size_t hdr_count; /* Size of header part of output buffer */ | |
304 | size_t size; | |
305 | int rc; | |
306 | ||
307 | mutex_lock(&zcore_mutex); | |
308 | ||
309 | if (*ppos > (sys_info.mem_size + HEADER_SIZE)) { | |
310 | rc = -EINVAL; | |
311 | goto fail; | |
312 | } | |
313 | ||
314 | count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos)); | |
315 | ||
316 | /* Copy dump header */ | |
317 | if (*ppos < HEADER_SIZE) { | |
318 | size = min(count, (size_t) (HEADER_SIZE - *ppos)); | |
319 | if (copy_to_user(buf, &zcore_header + *ppos, size)) { | |
320 | rc = -EFAULT; | |
321 | goto fail; | |
322 | } | |
323 | hdr_count = size; | |
324 | mem_start = 0; | |
325 | } else { | |
326 | hdr_count = 0; | |
327 | mem_start = *ppos - HEADER_SIZE; | |
328 | } | |
329 | ||
330 | mem_offs = 0; | |
331 | ||
332 | /* Copy from HSA data */ | |
333 | if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) { | |
334 | size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE | |
335 | - mem_start)); | |
336 | rc = memcpy_hsa_user(buf + hdr_count, mem_start, size); | |
337 | if (rc) | |
338 | goto fail; | |
339 | ||
340 | mem_offs += size; | |
341 | } | |
342 | ||
343 | /* Copy from real mem */ | |
344 | size = count - mem_offs - hdr_count; | |
7f0bf656 MH |
345 | rc = copy_to_user_real(buf + hdr_count + mem_offs, |
346 | (void *) mem_start + mem_offs, size); | |
411ed322 MH |
347 | if (rc) |
348 | goto fail; | |
349 | ||
350 | /* | |
351 | * Since s390 dump analysis tools like lcrash or crash | |
352 | * expect register sets in the prefix pages of the cpus, | |
353 | * we copy them into the read buffer, if necessary. | |
354 | * buf + hdr_count: Start of memory part of output buffer | |
355 | * mem_start: Start memory address to copy from | |
356 | * count - hdr_count: Size of memory area to copy | |
357 | */ | |
358 | if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) { | |
359 | rc = -EFAULT; | |
360 | goto fail; | |
361 | } | |
362 | *ppos += count; | |
363 | fail: | |
364 | mutex_unlock(&zcore_mutex); | |
365 | return (rc < 0) ? rc : count; | |
366 | } | |
367 | ||
368 | static int zcore_open(struct inode *inode, struct file *filp) | |
369 | { | |
370 | if (!hsa_available) | |
371 | return -ENODATA; | |
372 | else | |
373 | return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; | |
374 | } | |
375 | ||
376 | static int zcore_release(struct inode *inode, struct file *filep) | |
377 | { | |
b4b3d128 MH |
378 | if (hsa_available) |
379 | release_hsa(); | |
411ed322 MH |
380 | return 0; |
381 | } | |
382 | ||
383 | static loff_t zcore_lseek(struct file *file, loff_t offset, int orig) | |
384 | { | |
385 | loff_t rc; | |
386 | ||
387 | mutex_lock(&zcore_mutex); | |
388 | switch (orig) { | |
389 | case 0: | |
390 | file->f_pos = offset; | |
391 | rc = file->f_pos; | |
392 | break; | |
393 | case 1: | |
394 | file->f_pos += offset; | |
395 | rc = file->f_pos; | |
396 | break; | |
397 | default: | |
398 | rc = -EINVAL; | |
399 | } | |
400 | mutex_unlock(&zcore_mutex); | |
401 | return rc; | |
402 | } | |
403 | ||
5c81cdbe | 404 | static const struct file_operations zcore_fops = { |
411ed322 MH |
405 | .owner = THIS_MODULE, |
406 | .llseek = zcore_lseek, | |
407 | .read = zcore_read, | |
408 | .open = zcore_open, | |
409 | .release = zcore_release, | |
410 | }; | |
411 | ||
12e0c95e FM |
412 | static ssize_t zcore_memmap_read(struct file *filp, char __user *buf, |
413 | size_t count, loff_t *ppos) | |
414 | { | |
415 | return simple_read_from_buffer(buf, count, ppos, filp->private_data, | |
416 | MEMORY_CHUNKS * CHUNK_INFO_SIZE); | |
417 | } | |
418 | ||
419 | static int zcore_memmap_open(struct inode *inode, struct file *filp) | |
420 | { | |
421 | int i; | |
422 | char *buf; | |
423 | struct mem_chunk *chunk_array; | |
424 | ||
425 | chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk), | |
426 | GFP_KERNEL); | |
427 | if (!chunk_array) | |
428 | return -ENOMEM; | |
429 | detect_memory_layout(chunk_array); | |
430 | buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL); | |
431 | if (!buf) { | |
432 | kfree(chunk_array); | |
433 | return -ENOMEM; | |
434 | } | |
435 | for (i = 0; i < MEMORY_CHUNKS; i++) { | |
436 | sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ", | |
437 | (unsigned long long) chunk_array[i].addr, | |
438 | (unsigned long long) chunk_array[i].size); | |
439 | if (chunk_array[i].size == 0) | |
440 | break; | |
441 | } | |
442 | kfree(chunk_array); | |
443 | filp->private_data = buf; | |
58ea91c0 | 444 | return nonseekable_open(inode, filp); |
12e0c95e FM |
445 | } |
446 | ||
447 | static int zcore_memmap_release(struct inode *inode, struct file *filp) | |
448 | { | |
449 | kfree(filp->private_data); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | static const struct file_operations zcore_memmap_fops = { | |
454 | .owner = THIS_MODULE, | |
455 | .read = zcore_memmap_read, | |
456 | .open = zcore_memmap_open, | |
457 | .release = zcore_memmap_release, | |
6038f373 | 458 | .llseek = no_llseek, |
12e0c95e FM |
459 | }; |
460 | ||
099b7651 FM |
461 | static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf, |
462 | size_t count, loff_t *ppos) | |
463 | { | |
464 | if (ipl_block) { | |
465 | diag308(DIAG308_SET, ipl_block); | |
466 | diag308(DIAG308_IPL, NULL); | |
467 | } | |
468 | return count; | |
469 | } | |
470 | ||
471 | static int zcore_reipl_open(struct inode *inode, struct file *filp) | |
472 | { | |
58ea91c0 | 473 | return nonseekable_open(inode, filp); |
099b7651 FM |
474 | } |
475 | ||
476 | static int zcore_reipl_release(struct inode *inode, struct file *filp) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static const struct file_operations zcore_reipl_fops = { | |
482 | .owner = THIS_MODULE, | |
483 | .write = zcore_reipl_write, | |
484 | .open = zcore_reipl_open, | |
485 | .release = zcore_reipl_release, | |
6038f373 | 486 | .llseek = no_llseek, |
099b7651 FM |
487 | }; |
488 | ||
b4b3d128 MH |
489 | static ssize_t zcore_hsa_read(struct file *filp, char __user *buf, |
490 | size_t count, loff_t *ppos) | |
491 | { | |
492 | static char str[18]; | |
493 | ||
494 | if (hsa_available) | |
495 | snprintf(str, sizeof(str), "%lx\n", ZFCPDUMP_HSA_SIZE); | |
496 | else | |
497 | snprintf(str, sizeof(str), "0\n"); | |
498 | return simple_read_from_buffer(buf, count, ppos, str, strlen(str)); | |
499 | } | |
500 | ||
501 | static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf, | |
502 | size_t count, loff_t *ppos) | |
503 | { | |
504 | char value; | |
505 | ||
506 | if (*ppos != 0) | |
507 | return -EPIPE; | |
508 | if (copy_from_user(&value, buf, 1)) | |
509 | return -EFAULT; | |
510 | if (value != '0') | |
511 | return -EINVAL; | |
512 | release_hsa(); | |
513 | return count; | |
514 | } | |
515 | ||
516 | static const struct file_operations zcore_hsa_fops = { | |
517 | .owner = THIS_MODULE, | |
518 | .write = zcore_hsa_write, | |
519 | .read = zcore_hsa_read, | |
520 | .open = nonseekable_open, | |
521 | .llseek = no_llseek, | |
522 | }; | |
523 | ||
f64ca217 | 524 | #ifdef CONFIG_32BIT |
411ed322 | 525 | |
f64ca217 | 526 | static void __init set_lc_mask(struct save_area *map) |
411ed322 | 527 | { |
f64ca217 HC |
528 | memset(&map->ext_save, 0xff, sizeof(map->ext_save)); |
529 | memset(&map->timer, 0xff, sizeof(map->timer)); | |
530 | memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp)); | |
531 | memset(&map->psw, 0xff, sizeof(map->psw)); | |
532 | memset(&map->pref_reg, 0xff, sizeof(map->pref_reg)); | |
533 | memset(&map->acc_regs, 0xff, sizeof(map->acc_regs)); | |
534 | memset(&map->fp_regs, 0xff, sizeof(map->fp_regs)); | |
535 | memset(&map->gp_regs, 0xff, sizeof(map->gp_regs)); | |
536 | memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs)); | |
411ed322 MH |
537 | } |
538 | ||
f64ca217 HC |
539 | #else /* CONFIG_32BIT */ |
540 | ||
541 | static void __init set_lc_mask(struct save_area *map) | |
411ed322 | 542 | { |
f64ca217 HC |
543 | memset(&map->fp_regs, 0xff, sizeof(map->fp_regs)); |
544 | memset(&map->gp_regs, 0xff, sizeof(map->gp_regs)); | |
545 | memset(&map->psw, 0xff, sizeof(map->psw)); | |
546 | memset(&map->pref_reg, 0xff, sizeof(map->pref_reg)); | |
547 | memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg)); | |
548 | memset(&map->tod_reg, 0xff, sizeof(map->tod_reg)); | |
549 | memset(&map->timer, 0xff, sizeof(map->timer)); | |
550 | memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp)); | |
551 | memset(&map->acc_regs, 0xff, sizeof(map->acc_regs)); | |
552 | memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs)); | |
411ed322 MH |
553 | } |
554 | ||
f64ca217 HC |
555 | #endif /* CONFIG_32BIT */ |
556 | ||
411ed322 MH |
557 | /* |
558 | * Initialize dump globals for a given architecture | |
559 | */ | |
560 | static int __init sys_info_init(enum arch_id arch) | |
561 | { | |
2a062ab4 MH |
562 | int rc; |
563 | ||
411ed322 MH |
564 | switch (arch) { |
565 | case ARCH_S390X: | |
17159dc6 | 566 | pr_alert("DETECTED 'S390X (64 bit) OS'\n"); |
411ed322 MH |
567 | break; |
568 | case ARCH_S390: | |
17159dc6 | 569 | pr_alert("DETECTED 'S390 (32 bit) OS'\n"); |
411ed322 MH |
570 | break; |
571 | default: | |
17159dc6 | 572 | pr_alert("0x%x is an unknown architecture.\n",arch); |
411ed322 MH |
573 | return -EINVAL; |
574 | } | |
f64ca217 HC |
575 | sys_info.sa_base = SAVE_AREA_BASE; |
576 | sys_info.sa_size = sizeof(struct save_area); | |
411ed322 | 577 | sys_info.arch = arch; |
f64ca217 | 578 | set_lc_mask(&sys_info.lc_mask); |
2a062ab4 MH |
579 | rc = init_cpu_info(arch); |
580 | if (rc) | |
581 | return rc; | |
411ed322 MH |
582 | sys_info.mem_size = real_memory_size; |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static int __init check_sdias(void) | |
588 | { | |
589 | int rc, act_hsa_size; | |
590 | ||
591 | rc = sclp_sdias_blk_count(); | |
592 | if (rc < 0) { | |
2a062ab4 | 593 | TRACE("Could not determine HSA size\n"); |
411ed322 MH |
594 | return rc; |
595 | } | |
596 | act_hsa_size = (rc - 1) * PAGE_SIZE; | |
597 | if (act_hsa_size < ZFCPDUMP_HSA_SIZE) { | |
2a062ab4 | 598 | TRACE("HSA size too small: %i\n", act_hsa_size); |
411ed322 MH |
599 | return -EINVAL; |
600 | } | |
601 | return 0; | |
602 | } | |
603 | ||
12e0c95e FM |
604 | static int __init get_mem_size(unsigned long *mem) |
605 | { | |
606 | int i; | |
607 | struct mem_chunk *chunk_array; | |
608 | ||
609 | chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk), | |
610 | GFP_KERNEL); | |
611 | if (!chunk_array) | |
612 | return -ENOMEM; | |
613 | detect_memory_layout(chunk_array); | |
614 | for (i = 0; i < MEMORY_CHUNKS; i++) { | |
615 | if (chunk_array[i].size == 0) | |
616 | break; | |
617 | *mem += chunk_array[i].size; | |
618 | } | |
619 | kfree(chunk_array); | |
620 | return 0; | |
621 | } | |
622 | ||
623 | static int __init zcore_header_init(int arch, struct zcore_header *hdr) | |
411ed322 | 624 | { |
0cbde8ee | 625 | int rc, i; |
12e0c95e | 626 | unsigned long memory = 0; |
0cbde8ee | 627 | u32 prefix; |
12e0c95e | 628 | |
411ed322 MH |
629 | if (arch == ARCH_S390X) |
630 | hdr->arch_id = DUMP_ARCH_S390X; | |
631 | else | |
632 | hdr->arch_id = DUMP_ARCH_S390; | |
12e0c95e FM |
633 | rc = get_mem_size(&memory); |
634 | if (rc) | |
635 | return rc; | |
636 | hdr->mem_size = memory; | |
637 | hdr->rmem_size = memory; | |
411ed322 | 638 | hdr->mem_end = sys_info.mem_size; |
12e0c95e | 639 | hdr->num_pages = memory / PAGE_SIZE; |
411ed322 MH |
640 | hdr->tod = get_clock(); |
641 | get_cpu_id(&hdr->cpu_id); | |
0cbde8ee MH |
642 | for (i = 0; zfcpdump_save_areas[i]; i++) { |
643 | prefix = zfcpdump_save_areas[i]->pref_reg; | |
644 | hdr->real_cpu_cnt++; | |
645 | if (!prefix) | |
646 | continue; | |
647 | hdr->lc_vec[hdr->cpu_cnt] = prefix; | |
648 | hdr->cpu_cnt++; | |
649 | } | |
12e0c95e | 650 | return 0; |
411ed322 MH |
651 | } |
652 | ||
099b7651 FM |
653 | /* |
654 | * Provide IPL parameter information block from either HSA or memory | |
655 | * for future reipl | |
656 | */ | |
657 | static int __init zcore_reipl_init(void) | |
658 | { | |
659 | struct ipib_info ipib_info; | |
660 | int rc; | |
661 | ||
662 | rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info)); | |
663 | if (rc) | |
664 | return rc; | |
665 | if (ipib_info.ipib == 0) | |
666 | return 0; | |
667 | ipl_block = (void *) __get_free_page(GFP_KERNEL); | |
668 | if (!ipl_block) | |
669 | return -ENOMEM; | |
670 | if (ipib_info.ipib < ZFCPDUMP_HSA_SIZE) | |
671 | rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE); | |
672 | else | |
92fe3132 | 673 | rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE); |
76ef964c | 674 | if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) != |
159d1ff8 | 675 | ipib_info.checksum) { |
099b7651 FM |
676 | TRACE("Checksum does not match\n"); |
677 | free_page((unsigned long) ipl_block); | |
678 | ipl_block = NULL; | |
679 | } | |
680 | return 0; | |
681 | } | |
682 | ||
411ed322 MH |
683 | static int __init zcore_init(void) |
684 | { | |
685 | unsigned char arch; | |
686 | int rc; | |
687 | ||
688 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) | |
689 | return -ENODATA; | |
3f25dc4f MH |
690 | if (OLDMEM_BASE) |
691 | return -ENODATA; | |
411ed322 MH |
692 | |
693 | zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); | |
694 | debug_register_view(zcore_dbf, &debug_sprintf_view); | |
695 | debug_set_level(zcore_dbf, 6); | |
696 | ||
697 | TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); | |
698 | TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); | |
699 | TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); | |
700 | ||
763968e2 | 701 | rc = sclp_sdias_init(); |
411ed322 MH |
702 | if (rc) |
703 | goto fail; | |
704 | ||
705 | rc = check_sdias(); | |
2a062ab4 | 706 | if (rc) |
411ed322 | 707 | goto fail; |
b4b3d128 | 708 | hsa_available = 1; |
411ed322 MH |
709 | |
710 | rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); | |
2a062ab4 | 711 | if (rc) |
411ed322 | 712 | goto fail; |
411ed322 | 713 | |
f64ca217 HC |
714 | #ifdef CONFIG_64BIT |
715 | if (arch == ARCH_S390) { | |
716 | pr_alert("The 64-bit dump tool cannot be used for a " | |
717 | "32-bit system\n"); | |
718 | rc = -EINVAL; | |
719 | goto fail; | |
720 | } | |
721 | #else /* CONFIG_64BIT */ | |
411ed322 | 722 | if (arch == ARCH_S390X) { |
17159dc6 MH |
723 | pr_alert("The 32-bit dump tool cannot be used for a " |
724 | "64-bit system\n"); | |
411ed322 MH |
725 | rc = -EINVAL; |
726 | goto fail; | |
727 | } | |
f64ca217 | 728 | #endif /* CONFIG_64BIT */ |
411ed322 MH |
729 | |
730 | rc = sys_info_init(arch); | |
2a062ab4 | 731 | if (rc) |
411ed322 | 732 | goto fail; |
411ed322 | 733 | |
12e0c95e FM |
734 | rc = zcore_header_init(arch, &zcore_header); |
735 | if (rc) | |
736 | goto fail; | |
411ed322 | 737 | |
099b7651 FM |
738 | rc = zcore_reipl_init(); |
739 | if (rc) | |
740 | goto fail; | |
741 | ||
411ed322 MH |
742 | zcore_dir = debugfs_create_dir("zcore" , NULL); |
743 | if (!zcore_dir) { | |
744 | rc = -ENOMEM; | |
745 | goto fail; | |
746 | } | |
747 | zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL, | |
748 | &zcore_fops); | |
749 | if (!zcore_file) { | |
411ed322 | 750 | rc = -ENOMEM; |
12e0c95e FM |
751 | goto fail_dir; |
752 | } | |
753 | zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir, | |
754 | NULL, &zcore_memmap_fops); | |
755 | if (!zcore_memmap_file) { | |
756 | rc = -ENOMEM; | |
757 | goto fail_file; | |
411ed322 | 758 | } |
099b7651 FM |
759 | zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir, |
760 | NULL, &zcore_reipl_fops); | |
761 | if (!zcore_reipl_file) { | |
762 | rc = -ENOMEM; | |
763 | goto fail_memmap_file; | |
764 | } | |
b4b3d128 MH |
765 | zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir, |
766 | NULL, &zcore_hsa_fops); | |
767 | if (!zcore_hsa_file) { | |
768 | rc = -ENOMEM; | |
769 | goto fail_reipl_file; | |
770 | } | |
411ed322 MH |
771 | return 0; |
772 | ||
b4b3d128 MH |
773 | fail_reipl_file: |
774 | debugfs_remove(zcore_reipl_file); | |
099b7651 FM |
775 | fail_memmap_file: |
776 | debugfs_remove(zcore_memmap_file); | |
12e0c95e FM |
777 | fail_file: |
778 | debugfs_remove(zcore_file); | |
779 | fail_dir: | |
780 | debugfs_remove(zcore_dir); | |
411ed322 MH |
781 | fail: |
782 | diag308(DIAG308_REL_HSA, NULL); | |
783 | return rc; | |
784 | } | |
785 | ||
411ed322 MH |
786 | static void __exit zcore_exit(void) |
787 | { | |
788 | debug_unregister(zcore_dbf); | |
763968e2 | 789 | sclp_sdias_exit(); |
099b7651 | 790 | free_page((unsigned long) ipl_block); |
b4b3d128 | 791 | debugfs_remove(zcore_hsa_file); |
099b7651 FM |
792 | debugfs_remove(zcore_reipl_file); |
793 | debugfs_remove(zcore_memmap_file); | |
794 | debugfs_remove(zcore_file); | |
795 | debugfs_remove(zcore_dir); | |
411ed322 MH |
796 | diag308(DIAG308_REL_HSA, NULL); |
797 | } | |
798 | ||
099b7651 | 799 | MODULE_AUTHOR("Copyright IBM Corp. 2003,2008"); |
411ed322 MH |
800 | MODULE_DESCRIPTION("zcore module for zfcpdump support"); |
801 | MODULE_LICENSE("GPL"); | |
802 | ||
803 | subsys_initcall(zcore_init); | |
804 | module_exit(zcore_exit); |