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