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Commit | Line | Data |
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60a0c68d MH |
1 | /* |
2 | * S390 kdump implementation | |
3 | * | |
4 | * Copyright IBM Corp. 2011 | |
5 | * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com> | |
6 | */ | |
7 | ||
8 | #include <linux/crash_dump.h> | |
9 | #include <asm/lowcore.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/gfp.h> | |
13 | #include <linux/slab.h> | |
60a0c68d MH |
14 | #include <linux/bootmem.h> |
15 | #include <linux/elf.h> | |
4857d4bb | 16 | #include <asm/os_info.h> |
6b563d8c HC |
17 | #include <asm/elf.h> |
18 | #include <asm/ipl.h> | |
6f79d332 | 19 | #include <asm/sclp.h> |
60a0c68d MH |
20 | |
21 | #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) | |
22 | #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) | |
23 | #define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y)))) | |
24 | ||
58952942 MH |
25 | struct dump_save_areas dump_save_areas; |
26 | ||
27 | /* | |
28 | * Allocate and add a save area for a CPU | |
29 | */ | |
30 | struct save_area *dump_save_area_create(int cpu) | |
31 | { | |
32 | struct save_area **save_areas, *save_area; | |
33 | ||
34 | save_area = kmalloc(sizeof(*save_area), GFP_KERNEL); | |
35 | if (!save_area) | |
36 | return NULL; | |
37 | if (cpu + 1 > dump_save_areas.count) { | |
38 | dump_save_areas.count = cpu + 1; | |
39 | save_areas = krealloc(dump_save_areas.areas, | |
40 | dump_save_areas.count * sizeof(void *), | |
41 | GFP_KERNEL | __GFP_ZERO); | |
42 | if (!save_areas) { | |
43 | kfree(save_area); | |
44 | return NULL; | |
45 | } | |
46 | dump_save_areas.areas = save_areas; | |
47 | } | |
48 | dump_save_areas.areas[cpu] = save_area; | |
49 | return save_area; | |
50 | } | |
191a2fa0 MH |
51 | |
52 | /* | |
53 | * Return physical address for virtual address | |
54 | */ | |
55 | static inline void *load_real_addr(void *addr) | |
56 | { | |
57 | unsigned long real_addr; | |
58 | ||
59 | asm volatile( | |
60 | " lra %0,0(%1)\n" | |
61 | " jz 0f\n" | |
62 | " la %0,0\n" | |
63 | "0:" | |
64 | : "=a" (real_addr) : "a" (addr) : "cc"); | |
65 | return (void *)real_addr; | |
66 | } | |
67 | ||
68 | /* | |
4d3b0664 | 69 | * Copy real to virtual or real memory |
191a2fa0 | 70 | */ |
4d3b0664 | 71 | static int copy_from_realmem(void *dest, void *src, size_t count) |
191a2fa0 | 72 | { |
4d3b0664 | 73 | unsigned long size; |
4d3b0664 MH |
74 | |
75 | if (!count) | |
76 | return 0; | |
77 | if (!is_vmalloc_or_module_addr(dest)) | |
78 | return memcpy_real(dest, src, count); | |
79 | do { | |
80 | size = min(count, PAGE_SIZE - (__pa(dest) & ~PAGE_MASK)); | |
81 | if (memcpy_real(load_real_addr(dest), src, size)) | |
82 | return -EFAULT; | |
83 | count -= size; | |
84 | dest += size; | |
85 | src += size; | |
86 | } while (count); | |
87 | return 0; | |
191a2fa0 MH |
88 | } |
89 | ||
97b0f6f9 MH |
90 | /* |
91 | * Pointer to ELF header in new kernel | |
92 | */ | |
93 | static void *elfcorehdr_newmem; | |
94 | ||
60a0c68d | 95 | /* |
6f79d332 MH |
96 | * Copy one page from zfcpdump "oldmem" |
97 | * | |
e657d8fe | 98 | * For pages below HSA size memory from the HSA is copied. Otherwise |
6f79d332 MH |
99 | * real memory copy is used. |
100 | */ | |
101 | static ssize_t copy_oldmem_page_zfcpdump(char *buf, size_t csize, | |
102 | unsigned long src, int userbuf) | |
103 | { | |
104 | int rc; | |
105 | ||
e657d8fe | 106 | if (src < sclp_get_hsa_size()) { |
6f79d332 MH |
107 | rc = memcpy_hsa(buf, src, csize, userbuf); |
108 | } else { | |
109 | if (userbuf) | |
110 | rc = copy_to_user_real((void __force __user *) buf, | |
111 | (void *) src, csize); | |
112 | else | |
113 | rc = memcpy_real(buf, (void *) src, csize); | |
114 | } | |
115 | return rc ? rc : csize; | |
116 | } | |
117 | ||
118 | /* | |
119 | * Copy one page from kdump "oldmem" | |
60a0c68d MH |
120 | * |
121 | * For the kdump reserved memory this functions performs a swap operation: | |
122 | * - [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] is mapped to [0 - OLDMEM_SIZE]. | |
123 | * - [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] | |
124 | */ | |
6f79d332 MH |
125 | static ssize_t copy_oldmem_page_kdump(char *buf, size_t csize, |
126 | unsigned long src, int userbuf) | |
127 | ||
60a0c68d | 128 | { |
191a2fa0 | 129 | int rc; |
60a0c68d | 130 | |
60a0c68d MH |
131 | if (src < OLDMEM_SIZE) |
132 | src += OLDMEM_BASE; | |
133 | else if (src > OLDMEM_BASE && | |
134 | src < OLDMEM_BASE + OLDMEM_SIZE) | |
135 | src -= OLDMEM_BASE; | |
136 | if (userbuf) | |
191a2fa0 MH |
137 | rc = copy_to_user_real((void __force __user *) buf, |
138 | (void *) src, csize); | |
60a0c68d | 139 | else |
4d3b0664 | 140 | rc = copy_from_realmem(buf, (void *) src, csize); |
6f79d332 MH |
141 | return (rc == 0) ? rc : csize; |
142 | } | |
143 | ||
144 | /* | |
145 | * Copy one page from "oldmem" | |
146 | */ | |
147 | ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, | |
148 | unsigned long offset, int userbuf) | |
149 | { | |
150 | unsigned long src; | |
151 | ||
152 | if (!csize) | |
153 | return 0; | |
154 | src = (pfn << PAGE_SHIFT) + offset; | |
155 | if (OLDMEM_BASE) | |
156 | return copy_oldmem_page_kdump(buf, csize, src, userbuf); | |
157 | else | |
158 | return copy_oldmem_page_zfcpdump(buf, csize, src, userbuf); | |
60a0c68d MH |
159 | } |
160 | ||
23df79da | 161 | /* |
6f79d332 | 162 | * Remap "oldmem" for kdump |
23df79da JW |
163 | * |
164 | * For the kdump reserved memory this functions performs a swap operation: | |
165 | * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] | |
166 | */ | |
6f79d332 MH |
167 | static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma, |
168 | unsigned long from, unsigned long pfn, | |
169 | unsigned long size, pgprot_t prot) | |
23df79da JW |
170 | { |
171 | unsigned long size_old; | |
172 | int rc; | |
173 | ||
174 | if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) { | |
175 | size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT)); | |
176 | rc = remap_pfn_range(vma, from, | |
177 | pfn + (OLDMEM_BASE >> PAGE_SHIFT), | |
178 | size_old, prot); | |
179 | if (rc || size == size_old) | |
180 | return rc; | |
181 | size -= size_old; | |
182 | from += size_old; | |
183 | pfn += size_old >> PAGE_SHIFT; | |
184 | } | |
185 | return remap_pfn_range(vma, from, pfn, size, prot); | |
186 | } | |
187 | ||
6f79d332 MH |
188 | /* |
189 | * Remap "oldmem" for zfcpdump | |
190 | * | |
e657d8fe MH |
191 | * We only map available memory above HSA size. Memory below HSA size |
192 | * is read on demand using the copy_oldmem_page() function. | |
6f79d332 MH |
193 | */ |
194 | static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma, | |
195 | unsigned long from, | |
196 | unsigned long pfn, | |
197 | unsigned long size, pgprot_t prot) | |
198 | { | |
e657d8fe | 199 | unsigned long hsa_end = sclp_get_hsa_size(); |
6f79d332 MH |
200 | unsigned long size_hsa; |
201 | ||
e657d8fe MH |
202 | if (pfn < hsa_end >> PAGE_SHIFT) { |
203 | size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT)); | |
6f79d332 MH |
204 | if (size == size_hsa) |
205 | return 0; | |
206 | size -= size_hsa; | |
207 | from += size_hsa; | |
208 | pfn += size_hsa >> PAGE_SHIFT; | |
209 | } | |
210 | return remap_pfn_range(vma, from, pfn, size, prot); | |
211 | } | |
212 | ||
213 | /* | |
214 | * Remap "oldmem" for kdump or zfcpdump | |
215 | */ | |
216 | int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, | |
217 | unsigned long pfn, unsigned long size, pgprot_t prot) | |
218 | { | |
219 | if (OLDMEM_BASE) | |
220 | return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot); | |
221 | else | |
222 | return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size, | |
223 | prot); | |
224 | } | |
225 | ||
60a0c68d MH |
226 | /* |
227 | * Copy memory from old kernel | |
228 | */ | |
4857d4bb | 229 | int copy_from_oldmem(void *dest, void *src, size_t count) |
60a0c68d MH |
230 | { |
231 | unsigned long copied = 0; | |
232 | int rc; | |
233 | ||
6f79d332 MH |
234 | if (OLDMEM_BASE) { |
235 | if ((unsigned long) src < OLDMEM_SIZE) { | |
236 | copied = min(count, OLDMEM_SIZE - (unsigned long) src); | |
4d3b0664 | 237 | rc = copy_from_realmem(dest, src + OLDMEM_BASE, copied); |
6f79d332 MH |
238 | if (rc) |
239 | return rc; | |
240 | } | |
241 | } else { | |
e657d8fe MH |
242 | unsigned long hsa_end = sclp_get_hsa_size(); |
243 | if ((unsigned long) src < hsa_end) { | |
244 | copied = min(count, hsa_end - (unsigned long) src); | |
6f79d332 MH |
245 | rc = memcpy_hsa(dest, (unsigned long) src, copied, 0); |
246 | if (rc) | |
247 | return rc; | |
248 | } | |
60a0c68d | 249 | } |
4d3b0664 | 250 | return copy_from_realmem(dest + copied, src + copied, count - copied); |
60a0c68d MH |
251 | } |
252 | ||
253 | /* | |
254 | * Alloc memory and panic in case of ENOMEM | |
255 | */ | |
256 | static void *kzalloc_panic(int len) | |
257 | { | |
258 | void *rc; | |
259 | ||
260 | rc = kzalloc(len, GFP_KERNEL); | |
261 | if (!rc) | |
262 | panic("s390 kdump kzalloc (%d) failed", len); | |
263 | return rc; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Get memory layout and create hole for oldmem | |
268 | */ | |
269 | static struct mem_chunk *get_memory_layout(void) | |
270 | { | |
271 | struct mem_chunk *chunk_array; | |
272 | ||
273 | chunk_array = kzalloc_panic(MEMORY_CHUNKS * sizeof(struct mem_chunk)); | |
df1bd59c | 274 | detect_memory_layout(chunk_array, 0); |
996b4a7d | 275 | create_mem_hole(chunk_array, OLDMEM_BASE, OLDMEM_SIZE); |
60a0c68d MH |
276 | return chunk_array; |
277 | } | |
278 | ||
279 | /* | |
280 | * Initialize ELF note | |
281 | */ | |
282 | static void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len, | |
283 | const char *name) | |
284 | { | |
285 | Elf64_Nhdr *note; | |
286 | u64 len; | |
287 | ||
288 | note = (Elf64_Nhdr *)buf; | |
289 | note->n_namesz = strlen(name) + 1; | |
290 | note->n_descsz = d_len; | |
291 | note->n_type = type; | |
292 | len = sizeof(Elf64_Nhdr); | |
293 | ||
294 | memcpy(buf + len, name, note->n_namesz); | |
295 | len = roundup(len + note->n_namesz, 4); | |
296 | ||
297 | memcpy(buf + len, desc, note->n_descsz); | |
298 | len = roundup(len + note->n_descsz, 4); | |
299 | ||
300 | return PTR_ADD(buf, len); | |
301 | } | |
302 | ||
303 | /* | |
304 | * Initialize prstatus note | |
305 | */ | |
306 | static void *nt_prstatus(void *ptr, struct save_area *sa) | |
307 | { | |
308 | struct elf_prstatus nt_prstatus; | |
309 | static int cpu_nr = 1; | |
310 | ||
311 | memset(&nt_prstatus, 0, sizeof(nt_prstatus)); | |
312 | memcpy(&nt_prstatus.pr_reg.gprs, sa->gp_regs, sizeof(sa->gp_regs)); | |
313 | memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw)); | |
314 | memcpy(&nt_prstatus.pr_reg.acrs, sa->acc_regs, sizeof(sa->acc_regs)); | |
315 | nt_prstatus.pr_pid = cpu_nr; | |
316 | cpu_nr++; | |
317 | ||
318 | return nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus), | |
319 | "CORE"); | |
320 | } | |
321 | ||
322 | /* | |
323 | * Initialize fpregset (floating point) note | |
324 | */ | |
325 | static void *nt_fpregset(void *ptr, struct save_area *sa) | |
326 | { | |
327 | elf_fpregset_t nt_fpregset; | |
328 | ||
329 | memset(&nt_fpregset, 0, sizeof(nt_fpregset)); | |
330 | memcpy(&nt_fpregset.fpc, &sa->fp_ctrl_reg, sizeof(sa->fp_ctrl_reg)); | |
331 | memcpy(&nt_fpregset.fprs, &sa->fp_regs, sizeof(sa->fp_regs)); | |
332 | ||
333 | return nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset), | |
334 | "CORE"); | |
335 | } | |
336 | ||
337 | /* | |
338 | * Initialize timer note | |
339 | */ | |
340 | static void *nt_s390_timer(void *ptr, struct save_area *sa) | |
341 | { | |
342 | return nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer), | |
343 | KEXEC_CORE_NOTE_NAME); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Initialize TOD clock comparator note | |
348 | */ | |
349 | static void *nt_s390_tod_cmp(void *ptr, struct save_area *sa) | |
350 | { | |
351 | return nt_init(ptr, NT_S390_TODCMP, &sa->clk_cmp, | |
352 | sizeof(sa->clk_cmp), KEXEC_CORE_NOTE_NAME); | |
353 | } | |
354 | ||
355 | /* | |
356 | * Initialize TOD programmable register note | |
357 | */ | |
358 | static void *nt_s390_tod_preg(void *ptr, struct save_area *sa) | |
359 | { | |
360 | return nt_init(ptr, NT_S390_TODPREG, &sa->tod_reg, | |
361 | sizeof(sa->tod_reg), KEXEC_CORE_NOTE_NAME); | |
362 | } | |
363 | ||
364 | /* | |
365 | * Initialize control register note | |
366 | */ | |
367 | static void *nt_s390_ctrs(void *ptr, struct save_area *sa) | |
368 | { | |
369 | return nt_init(ptr, NT_S390_CTRS, &sa->ctrl_regs, | |
370 | sizeof(sa->ctrl_regs), KEXEC_CORE_NOTE_NAME); | |
371 | } | |
372 | ||
373 | /* | |
374 | * Initialize prefix register note | |
375 | */ | |
376 | static void *nt_s390_prefix(void *ptr, struct save_area *sa) | |
377 | { | |
378 | return nt_init(ptr, NT_S390_PREFIX, &sa->pref_reg, | |
379 | sizeof(sa->pref_reg), KEXEC_CORE_NOTE_NAME); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Fill ELF notes for one CPU with save area registers | |
384 | */ | |
385 | void *fill_cpu_elf_notes(void *ptr, struct save_area *sa) | |
386 | { | |
387 | ptr = nt_prstatus(ptr, sa); | |
388 | ptr = nt_fpregset(ptr, sa); | |
389 | ptr = nt_s390_timer(ptr, sa); | |
390 | ptr = nt_s390_tod_cmp(ptr, sa); | |
391 | ptr = nt_s390_tod_preg(ptr, sa); | |
392 | ptr = nt_s390_ctrs(ptr, sa); | |
393 | ptr = nt_s390_prefix(ptr, sa); | |
394 | return ptr; | |
395 | } | |
396 | ||
397 | /* | |
398 | * Initialize prpsinfo note (new kernel) | |
399 | */ | |
400 | static void *nt_prpsinfo(void *ptr) | |
401 | { | |
402 | struct elf_prpsinfo prpsinfo; | |
403 | ||
404 | memset(&prpsinfo, 0, sizeof(prpsinfo)); | |
405 | prpsinfo.pr_sname = 'R'; | |
406 | strcpy(prpsinfo.pr_fname, "vmlinux"); | |
407 | return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo), | |
408 | KEXEC_CORE_NOTE_NAME); | |
409 | } | |
410 | ||
411 | /* | |
4857d4bb | 412 | * Get vmcoreinfo using lowcore->vmcore_info (new kernel) |
60a0c68d | 413 | */ |
4857d4bb | 414 | static void *get_vmcoreinfo_old(unsigned long *size) |
60a0c68d MH |
415 | { |
416 | char nt_name[11], *vmcoreinfo; | |
417 | Elf64_Nhdr note; | |
418 | void *addr; | |
419 | ||
420 | if (copy_from_oldmem(&addr, &S390_lowcore.vmcore_info, sizeof(addr))) | |
4857d4bb | 421 | return NULL; |
60a0c68d MH |
422 | memset(nt_name, 0, sizeof(nt_name)); |
423 | if (copy_from_oldmem(¬e, addr, sizeof(note))) | |
4857d4bb | 424 | return NULL; |
60a0c68d | 425 | if (copy_from_oldmem(nt_name, addr + sizeof(note), sizeof(nt_name) - 1)) |
4857d4bb | 426 | return NULL; |
60a0c68d | 427 | if (strcmp(nt_name, "VMCOREINFO") != 0) |
4857d4bb MH |
428 | return NULL; |
429 | vmcoreinfo = kzalloc_panic(note.n_descsz); | |
60a0c68d | 430 | if (copy_from_oldmem(vmcoreinfo, addr + 24, note.n_descsz)) |
4857d4bb MH |
431 | return NULL; |
432 | *size = note.n_descsz; | |
433 | return vmcoreinfo; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Initialize vmcoreinfo note (new kernel) | |
438 | */ | |
439 | static void *nt_vmcoreinfo(void *ptr) | |
440 | { | |
441 | unsigned long size; | |
442 | void *vmcoreinfo; | |
443 | ||
444 | vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size); | |
445 | if (!vmcoreinfo) | |
446 | vmcoreinfo = get_vmcoreinfo_old(&size); | |
447 | if (!vmcoreinfo) | |
60a0c68d | 448 | return ptr; |
4857d4bb | 449 | return nt_init(ptr, 0, vmcoreinfo, size, "VMCOREINFO"); |
60a0c68d MH |
450 | } |
451 | ||
452 | /* | |
453 | * Initialize ELF header (new kernel) | |
454 | */ | |
455 | static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt) | |
456 | { | |
457 | memset(ehdr, 0, sizeof(*ehdr)); | |
458 | memcpy(ehdr->e_ident, ELFMAG, SELFMAG); | |
459 | ehdr->e_ident[EI_CLASS] = ELFCLASS64; | |
460 | ehdr->e_ident[EI_DATA] = ELFDATA2MSB; | |
461 | ehdr->e_ident[EI_VERSION] = EV_CURRENT; | |
462 | memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD); | |
463 | ehdr->e_type = ET_CORE; | |
464 | ehdr->e_machine = EM_S390; | |
465 | ehdr->e_version = EV_CURRENT; | |
466 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
467 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
468 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
469 | ehdr->e_phnum = mem_chunk_cnt + 1; | |
470 | return ehdr + 1; | |
471 | } | |
472 | ||
473 | /* | |
474 | * Return CPU count for ELF header (new kernel) | |
475 | */ | |
476 | static int get_cpu_cnt(void) | |
477 | { | |
478 | int i, cpus = 0; | |
479 | ||
58952942 MH |
480 | for (i = 0; i < dump_save_areas.count; i++) { |
481 | if (dump_save_areas.areas[i]->pref_reg == 0) | |
60a0c68d MH |
482 | continue; |
483 | cpus++; | |
484 | } | |
485 | return cpus; | |
486 | } | |
487 | ||
488 | /* | |
489 | * Return memory chunk count for ELF header (new kernel) | |
490 | */ | |
491 | static int get_mem_chunk_cnt(void) | |
492 | { | |
493 | struct mem_chunk *chunk_array, *mem_chunk; | |
494 | int i, cnt = 0; | |
495 | ||
496 | chunk_array = get_memory_layout(); | |
497 | for (i = 0; i < MEMORY_CHUNKS; i++) { | |
498 | mem_chunk = &chunk_array[i]; | |
499 | if (chunk_array[i].type != CHUNK_READ_WRITE && | |
500 | chunk_array[i].type != CHUNK_READ_ONLY) | |
501 | continue; | |
502 | if (mem_chunk->size == 0) | |
503 | continue; | |
504 | cnt++; | |
505 | } | |
506 | kfree(chunk_array); | |
507 | return cnt; | |
508 | } | |
509 | ||
60a0c68d MH |
510 | /* |
511 | * Initialize ELF loads (new kernel) | |
512 | */ | |
513 | static int loads_init(Elf64_Phdr *phdr, u64 loads_offset) | |
514 | { | |
515 | struct mem_chunk *chunk_array, *mem_chunk; | |
516 | int i; | |
517 | ||
518 | chunk_array = get_memory_layout(); | |
519 | for (i = 0; i < MEMORY_CHUNKS; i++) { | |
520 | mem_chunk = &chunk_array[i]; | |
521 | if (mem_chunk->size == 0) | |
996b4a7d | 522 | continue; |
60a0c68d MH |
523 | if (chunk_array[i].type != CHUNK_READ_WRITE && |
524 | chunk_array[i].type != CHUNK_READ_ONLY) | |
525 | continue; | |
526 | else | |
527 | phdr->p_filesz = mem_chunk->size; | |
528 | phdr->p_type = PT_LOAD; | |
529 | phdr->p_offset = mem_chunk->addr; | |
530 | phdr->p_vaddr = mem_chunk->addr; | |
531 | phdr->p_paddr = mem_chunk->addr; | |
532 | phdr->p_memsz = mem_chunk->size; | |
533 | phdr->p_flags = PF_R | PF_W | PF_X; | |
534 | phdr->p_align = PAGE_SIZE; | |
535 | phdr++; | |
536 | } | |
537 | kfree(chunk_array); | |
538 | return i; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Initialize notes (new kernel) | |
543 | */ | |
544 | static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset) | |
545 | { | |
546 | struct save_area *sa; | |
547 | void *ptr_start = ptr; | |
548 | int i; | |
549 | ||
550 | ptr = nt_prpsinfo(ptr); | |
551 | ||
58952942 MH |
552 | for (i = 0; i < dump_save_areas.count; i++) { |
553 | sa = dump_save_areas.areas[i]; | |
60a0c68d MH |
554 | if (sa->pref_reg == 0) |
555 | continue; | |
556 | ptr = fill_cpu_elf_notes(ptr, sa); | |
557 | } | |
558 | ptr = nt_vmcoreinfo(ptr); | |
559 | memset(phdr, 0, sizeof(*phdr)); | |
560 | phdr->p_type = PT_NOTE; | |
97b0f6f9 | 561 | phdr->p_offset = notes_offset; |
60a0c68d MH |
562 | phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start); |
563 | phdr->p_memsz = phdr->p_filesz; | |
564 | return ptr; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Create ELF core header (new kernel) | |
569 | */ | |
97b0f6f9 | 570 | int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) |
60a0c68d MH |
571 | { |
572 | Elf64_Phdr *phdr_notes, *phdr_loads; | |
573 | int mem_chunk_cnt; | |
574 | void *ptr, *hdr; | |
575 | u32 alloc_size; | |
576 | u64 hdr_off; | |
577 | ||
6f79d332 MH |
578 | /* If we are not in kdump or zfcpdump mode return */ |
579 | if (!OLDMEM_BASE && ipl_info.type != IPL_TYPE_FCP_DUMP) | |
97b0f6f9 MH |
580 | return 0; |
581 | /* If elfcorehdr= has been passed via cmdline, we use that one */ | |
582 | if (elfcorehdr_addr != ELFCORE_ADDR_MAX) | |
583 | return 0; | |
e657d8fe MH |
584 | /* If we cannot get HSA size for zfcpdump return error */ |
585 | if (ipl_info.type == IPL_TYPE_FCP_DUMP && !sclp_get_hsa_size()) | |
586 | return -ENODEV; | |
60a0c68d MH |
587 | mem_chunk_cnt = get_mem_chunk_cnt(); |
588 | ||
589 | alloc_size = 0x1000 + get_cpu_cnt() * 0x300 + | |
590 | mem_chunk_cnt * sizeof(Elf64_Phdr); | |
591 | hdr = kzalloc_panic(alloc_size); | |
592 | /* Init elf header */ | |
593 | ptr = ehdr_init(hdr, mem_chunk_cnt); | |
594 | /* Init program headers */ | |
595 | phdr_notes = ptr; | |
596 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr)); | |
597 | phdr_loads = ptr; | |
598 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt); | |
599 | /* Init notes */ | |
600 | hdr_off = PTR_DIFF(ptr, hdr); | |
601 | ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off); | |
602 | /* Init loads */ | |
603 | hdr_off = PTR_DIFF(ptr, hdr); | |
97b0f6f9 MH |
604 | loads_init(phdr_loads, hdr_off); |
605 | *addr = (unsigned long long) hdr; | |
606 | elfcorehdr_newmem = hdr; | |
607 | *size = (unsigned long long) hdr_off; | |
608 | BUG_ON(elfcorehdr_size > alloc_size); | |
609 | return 0; | |
60a0c68d MH |
610 | } |
611 | ||
612 | /* | |
97b0f6f9 | 613 | * Free ELF core header (new kernel) |
60a0c68d | 614 | */ |
97b0f6f9 | 615 | void elfcorehdr_free(unsigned long long addr) |
60a0c68d | 616 | { |
97b0f6f9 MH |
617 | if (!elfcorehdr_newmem) |
618 | return; | |
619 | kfree((void *)(unsigned long)addr); | |
620 | } | |
621 | ||
622 | /* | |
623 | * Read from ELF header | |
624 | */ | |
625 | ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos) | |
626 | { | |
627 | void *src = (void *)(unsigned long)*ppos; | |
628 | ||
629 | src = elfcorehdr_newmem ? src : src - OLDMEM_BASE; | |
630 | memcpy(buf, src, count); | |
631 | *ppos += count; | |
632 | return count; | |
60a0c68d MH |
633 | } |
634 | ||
97b0f6f9 MH |
635 | /* |
636 | * Read from ELF notes data | |
637 | */ | |
638 | ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos) | |
639 | { | |
640 | void *src = (void *)(unsigned long)*ppos; | |
641 | int rc; | |
642 | ||
643 | if (elfcorehdr_newmem) { | |
644 | memcpy(buf, src, count); | |
645 | } else { | |
646 | rc = copy_from_oldmem(buf, src, count); | |
647 | if (rc) | |
648 | return rc; | |
649 | } | |
650 | *ppos += count; | |
651 | return count; | |
652 | } |