1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * S390 kdump implementation |
4 | * |
5 | * Copyright IBM Corp. 2011 |
6 | * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com> |
7 | */ |
8 | |
9 | #include <linux/crash_dump.h> |
10 | #include <asm/lowcore.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/init.h> |
13 | #include <linux/mm.h> |
14 | #include <linux/gfp.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/memblock.h> |
17 | #include <linux/elf.h> |
18 | #include <linux/uio.h> |
19 | #include <asm/asm-offsets.h> |
20 | #include <asm/os_info.h> |
21 | #include <asm/elf.h> |
22 | #include <asm/ipl.h> |
23 | #include <asm/sclp.h> |
24 | #include <asm/maccess.h> |
25 | #include <asm/fpu.h> |
26 | |
27 | #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) |
28 | #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) |
29 | #define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y)))) |
30 | |
31 | static struct memblock_region oldmem_region; |
32 | |
33 | static struct memblock_type oldmem_type = { |
34 | .cnt = 1, |
35 | .max = 1, |
36 | .total_size = 0, |
37 | .regions = &oldmem_region, |
38 | .name = "oldmem" , |
39 | }; |
40 | |
41 | struct save_area { |
42 | struct list_head list; |
43 | u64 psw[2]; |
44 | u64 ctrs[16]; |
45 | u64 gprs[16]; |
46 | u32 acrs[16]; |
47 | u64 fprs[16]; |
48 | u32 fpc; |
49 | u32 prefix; |
50 | u32 todpreg; |
51 | u64 timer; |
52 | u64 todcmp; |
53 | u64 vxrs_low[16]; |
54 | __vector128 vxrs_high[16]; |
55 | }; |
56 | |
57 | static LIST_HEAD(dump_save_areas); |
58 | |
59 | /* |
60 | * Allocate a save area |
61 | */ |
62 | struct save_area * __init save_area_alloc(bool is_boot_cpu) |
63 | { |
64 | struct save_area *sa; |
65 | |
66 | sa = memblock_alloc(size: sizeof(*sa), align: 8); |
67 | if (!sa) |
68 | return NULL; |
69 | |
70 | if (is_boot_cpu) |
71 | list_add(new: &sa->list, head: &dump_save_areas); |
72 | else |
73 | list_add_tail(new: &sa->list, head: &dump_save_areas); |
74 | return sa; |
75 | } |
76 | |
77 | /* |
78 | * Return the address of the save area for the boot CPU |
79 | */ |
80 | struct save_area * __init save_area_boot_cpu(void) |
81 | { |
82 | return list_first_entry_or_null(&dump_save_areas, struct save_area, list); |
83 | } |
84 | |
85 | /* |
86 | * Copy CPU registers into the save area |
87 | */ |
88 | void __init save_area_add_regs(struct save_area *sa, void *regs) |
89 | { |
90 | struct lowcore *lc; |
91 | |
92 | lc = (struct lowcore *)(regs - __LC_FPREGS_SAVE_AREA); |
93 | memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw)); |
94 | memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs)); |
95 | memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs)); |
96 | memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs)); |
97 | memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs)); |
98 | memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc)); |
99 | memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix)); |
100 | memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg)); |
101 | memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer)); |
102 | memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp)); |
103 | } |
104 | |
105 | /* |
106 | * Copy vector registers into the save area |
107 | */ |
108 | void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs) |
109 | { |
110 | int i; |
111 | |
112 | /* Copy lower halves of vector registers 0-15 */ |
113 | for (i = 0; i < 16; i++) |
114 | sa->vxrs_low[i] = vxrs[i].low; |
115 | /* Copy vector registers 16-31 */ |
116 | memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128)); |
117 | } |
118 | |
119 | static size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count) |
120 | { |
121 | size_t len, copied, res = 0; |
122 | |
123 | while (count) { |
124 | if (!oldmem_data.start && src < sclp.hsa_size) { |
125 | /* Copy from zfcp/nvme dump HSA area */ |
126 | len = min(count, sclp.hsa_size - src); |
127 | copied = memcpy_hsa_iter(iter, src, len); |
128 | } else { |
129 | /* Check for swapped kdump oldmem areas */ |
130 | if (oldmem_data.start && src - oldmem_data.start < oldmem_data.size) { |
131 | src -= oldmem_data.start; |
132 | len = min(count, oldmem_data.size - src); |
133 | } else if (oldmem_data.start && src < oldmem_data.size) { |
134 | len = min(count, oldmem_data.size - src); |
135 | src += oldmem_data.start; |
136 | } else { |
137 | len = count; |
138 | } |
139 | copied = memcpy_real_iter(iter, src, len); |
140 | } |
141 | count -= copied; |
142 | src += copied; |
143 | res += copied; |
144 | if (copied < len) |
145 | break; |
146 | } |
147 | return res; |
148 | } |
149 | |
150 | int copy_oldmem_kernel(void *dst, unsigned long src, size_t count) |
151 | { |
152 | struct iov_iter iter; |
153 | struct kvec kvec; |
154 | |
155 | kvec.iov_base = dst; |
156 | kvec.iov_len = count; |
157 | iov_iter_kvec(i: &iter, ITER_DEST, kvec: &kvec, nr_segs: 1, count); |
158 | if (copy_oldmem_iter(iter: &iter, src, count) < count) |
159 | return -EFAULT; |
160 | return 0; |
161 | } |
162 | |
163 | /* |
164 | * Copy one page from "oldmem" |
165 | */ |
166 | ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize, |
167 | unsigned long offset) |
168 | { |
169 | unsigned long src; |
170 | |
171 | src = pfn_to_phys(pfn) + offset; |
172 | return copy_oldmem_iter(iter, src, count: csize); |
173 | } |
174 | |
175 | /* |
176 | * Remap "oldmem" for kdump |
177 | * |
178 | * For the kdump reserved memory this functions performs a swap operation: |
179 | * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] |
180 | */ |
181 | static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma, |
182 | unsigned long from, unsigned long pfn, |
183 | unsigned long size, pgprot_t prot) |
184 | { |
185 | unsigned long size_old; |
186 | int rc; |
187 | |
188 | if (pfn < oldmem_data.size >> PAGE_SHIFT) { |
189 | size_old = min(size, oldmem_data.size - (pfn << PAGE_SHIFT)); |
190 | rc = remap_pfn_range(vma, from, |
191 | pfn + (oldmem_data.start >> PAGE_SHIFT), |
192 | size_old, prot); |
193 | if (rc || size == size_old) |
194 | return rc; |
195 | size -= size_old; |
196 | from += size_old; |
197 | pfn += size_old >> PAGE_SHIFT; |
198 | } |
199 | return remap_pfn_range(vma, addr: from, pfn, size, prot); |
200 | } |
201 | |
202 | /* |
203 | * Remap "oldmem" for zfcp/nvme dump |
204 | * |
205 | * We only map available memory above HSA size. Memory below HSA size |
206 | * is read on demand using the copy_oldmem_page() function. |
207 | */ |
208 | static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma, |
209 | unsigned long from, |
210 | unsigned long pfn, |
211 | unsigned long size, pgprot_t prot) |
212 | { |
213 | unsigned long hsa_end = sclp.hsa_size; |
214 | unsigned long size_hsa; |
215 | |
216 | if (pfn < hsa_end >> PAGE_SHIFT) { |
217 | size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT)); |
218 | if (size == size_hsa) |
219 | return 0; |
220 | size -= size_hsa; |
221 | from += size_hsa; |
222 | pfn += size_hsa >> PAGE_SHIFT; |
223 | } |
224 | return remap_pfn_range(vma, addr: from, pfn, size, prot); |
225 | } |
226 | |
227 | /* |
228 | * Remap "oldmem" for kdump or zfcp/nvme dump |
229 | */ |
230 | int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, |
231 | unsigned long pfn, unsigned long size, pgprot_t prot) |
232 | { |
233 | if (oldmem_data.start) |
234 | return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot); |
235 | else |
236 | return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size, |
237 | prot); |
238 | } |
239 | |
240 | static const char *nt_name(Elf64_Word type) |
241 | { |
242 | const char *name = "LINUX" ; |
243 | |
244 | if (type == NT_PRPSINFO || type == NT_PRSTATUS || type == NT_PRFPREG) |
245 | name = KEXEC_CORE_NOTE_NAME; |
246 | return name; |
247 | } |
248 | |
249 | /* |
250 | * Initialize ELF note |
251 | */ |
252 | static void *nt_init_name(void *buf, Elf64_Word type, void *desc, int d_len, |
253 | const char *name) |
254 | { |
255 | Elf64_Nhdr *note; |
256 | u64 len; |
257 | |
258 | note = (Elf64_Nhdr *)buf; |
259 | note->n_namesz = strlen(name) + 1; |
260 | note->n_descsz = d_len; |
261 | note->n_type = type; |
262 | len = sizeof(Elf64_Nhdr); |
263 | |
264 | memcpy(buf + len, name, note->n_namesz); |
265 | len = roundup(len + note->n_namesz, 4); |
266 | |
267 | memcpy(buf + len, desc, note->n_descsz); |
268 | len = roundup(len + note->n_descsz, 4); |
269 | |
270 | return PTR_ADD(buf, len); |
271 | } |
272 | |
273 | static inline void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len) |
274 | { |
275 | return nt_init_name(buf, type, desc, d_len, name: nt_name(type)); |
276 | } |
277 | |
278 | /* |
279 | * Calculate the size of ELF note |
280 | */ |
281 | static size_t nt_size_name(int d_len, const char *name) |
282 | { |
283 | size_t size; |
284 | |
285 | size = sizeof(Elf64_Nhdr); |
286 | size += roundup(strlen(name) + 1, 4); |
287 | size += roundup(d_len, 4); |
288 | |
289 | return size; |
290 | } |
291 | |
292 | static inline size_t nt_size(Elf64_Word type, int d_len) |
293 | { |
294 | return nt_size_name(d_len, name: nt_name(type)); |
295 | } |
296 | |
297 | /* |
298 | * Fill ELF notes for one CPU with save area registers |
299 | */ |
300 | static void *fill_cpu_elf_notes(void *ptr, int cpu, struct save_area *sa) |
301 | { |
302 | struct elf_prstatus nt_prstatus; |
303 | elf_fpregset_t nt_fpregset; |
304 | |
305 | /* Prepare prstatus note */ |
306 | memset(&nt_prstatus, 0, sizeof(nt_prstatus)); |
307 | memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs)); |
308 | memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw)); |
309 | memcpy(&nt_prstatus.pr_reg.acrs, sa->acrs, sizeof(sa->acrs)); |
310 | nt_prstatus.common.pr_pid = cpu; |
311 | /* Prepare fpregset (floating point) note */ |
312 | memset(&nt_fpregset, 0, sizeof(nt_fpregset)); |
313 | memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc)); |
314 | memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs)); |
315 | /* Create ELF notes for the CPU */ |
316 | ptr = nt_init(buf: ptr, NT_PRSTATUS, desc: &nt_prstatus, d_len: sizeof(nt_prstatus)); |
317 | ptr = nt_init(buf: ptr, NT_PRFPREG, desc: &nt_fpregset, d_len: sizeof(nt_fpregset)); |
318 | ptr = nt_init(buf: ptr, NT_S390_TIMER, desc: &sa->timer, d_len: sizeof(sa->timer)); |
319 | ptr = nt_init(buf: ptr, NT_S390_TODCMP, desc: &sa->todcmp, d_len: sizeof(sa->todcmp)); |
320 | ptr = nt_init(buf: ptr, NT_S390_TODPREG, desc: &sa->todpreg, d_len: sizeof(sa->todpreg)); |
321 | ptr = nt_init(buf: ptr, NT_S390_CTRS, desc: &sa->ctrs, d_len: sizeof(sa->ctrs)); |
322 | ptr = nt_init(buf: ptr, NT_S390_PREFIX, desc: &sa->prefix, d_len: sizeof(sa->prefix)); |
323 | if (cpu_has_vx()) { |
324 | ptr = nt_init(buf: ptr, NT_S390_VXRS_HIGH, |
325 | desc: &sa->vxrs_high, d_len: sizeof(sa->vxrs_high)); |
326 | ptr = nt_init(buf: ptr, NT_S390_VXRS_LOW, |
327 | desc: &sa->vxrs_low, d_len: sizeof(sa->vxrs_low)); |
328 | } |
329 | return ptr; |
330 | } |
331 | |
332 | /* |
333 | * Calculate size of ELF notes per cpu |
334 | */ |
335 | static size_t get_cpu_elf_notes_size(void) |
336 | { |
337 | struct save_area *sa = NULL; |
338 | size_t size; |
339 | |
340 | size = nt_size(NT_PRSTATUS, d_len: sizeof(struct elf_prstatus)); |
341 | size += nt_size(NT_PRFPREG, d_len: sizeof(elf_fpregset_t)); |
342 | size += nt_size(NT_S390_TIMER, d_len: sizeof(sa->timer)); |
343 | size += nt_size(NT_S390_TODCMP, d_len: sizeof(sa->todcmp)); |
344 | size += nt_size(NT_S390_TODPREG, d_len: sizeof(sa->todpreg)); |
345 | size += nt_size(NT_S390_CTRS, d_len: sizeof(sa->ctrs)); |
346 | size += nt_size(NT_S390_PREFIX, d_len: sizeof(sa->prefix)); |
347 | if (cpu_has_vx()) { |
348 | size += nt_size(NT_S390_VXRS_HIGH, d_len: sizeof(sa->vxrs_high)); |
349 | size += nt_size(NT_S390_VXRS_LOW, d_len: sizeof(sa->vxrs_low)); |
350 | } |
351 | |
352 | return size; |
353 | } |
354 | |
355 | /* |
356 | * Initialize prpsinfo note (new kernel) |
357 | */ |
358 | static void *nt_prpsinfo(void *ptr) |
359 | { |
360 | struct elf_prpsinfo prpsinfo; |
361 | |
362 | memset(&prpsinfo, 0, sizeof(prpsinfo)); |
363 | prpsinfo.pr_sname = 'R'; |
364 | strcpy(p: prpsinfo.pr_fname, q: "vmlinux" ); |
365 | return nt_init(buf: ptr, NT_PRPSINFO, desc: &prpsinfo, d_len: sizeof(prpsinfo)); |
366 | } |
367 | |
368 | /* |
369 | * Get vmcoreinfo using lowcore->vmcore_info (new kernel) |
370 | */ |
371 | static void *get_vmcoreinfo_old(unsigned long *size) |
372 | { |
373 | char nt_name[11], *vmcoreinfo; |
374 | unsigned long addr; |
375 | Elf64_Nhdr note; |
376 | |
377 | if (copy_oldmem_kernel(dst: &addr, src: __LC_VMCORE_INFO, count: sizeof(addr))) |
378 | return NULL; |
379 | memset(nt_name, 0, sizeof(nt_name)); |
380 | if (copy_oldmem_kernel(dst: ¬e, src: addr, count: sizeof(note))) |
381 | return NULL; |
382 | if (copy_oldmem_kernel(dst: nt_name, src: addr + sizeof(note), |
383 | count: sizeof(nt_name) - 1)) |
384 | return NULL; |
385 | if (strcmp(nt_name, VMCOREINFO_NOTE_NAME) != 0) |
386 | return NULL; |
387 | vmcoreinfo = kzalloc(size: note.n_descsz, GFP_KERNEL); |
388 | if (!vmcoreinfo) |
389 | return NULL; |
390 | if (copy_oldmem_kernel(dst: vmcoreinfo, src: addr + 24, count: note.n_descsz)) { |
391 | kfree(objp: vmcoreinfo); |
392 | return NULL; |
393 | } |
394 | *size = note.n_descsz; |
395 | return vmcoreinfo; |
396 | } |
397 | |
398 | /* |
399 | * Initialize vmcoreinfo note (new kernel) |
400 | */ |
401 | static void *nt_vmcoreinfo(void *ptr) |
402 | { |
403 | const char *name = VMCOREINFO_NOTE_NAME; |
404 | unsigned long size; |
405 | void *vmcoreinfo; |
406 | |
407 | vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size); |
408 | if (vmcoreinfo) |
409 | return nt_init_name(buf: ptr, type: 0, desc: vmcoreinfo, d_len: size, name); |
410 | |
411 | vmcoreinfo = get_vmcoreinfo_old(size: &size); |
412 | if (!vmcoreinfo) |
413 | return ptr; |
414 | ptr = nt_init_name(buf: ptr, type: 0, desc: vmcoreinfo, d_len: size, name); |
415 | kfree(objp: vmcoreinfo); |
416 | return ptr; |
417 | } |
418 | |
419 | static size_t nt_vmcoreinfo_size(void) |
420 | { |
421 | const char *name = VMCOREINFO_NOTE_NAME; |
422 | unsigned long size; |
423 | void *vmcoreinfo; |
424 | |
425 | vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size); |
426 | if (vmcoreinfo) |
427 | return nt_size_name(d_len: size, name); |
428 | |
429 | vmcoreinfo = get_vmcoreinfo_old(size: &size); |
430 | if (!vmcoreinfo) |
431 | return 0; |
432 | |
433 | kfree(objp: vmcoreinfo); |
434 | return nt_size_name(d_len: size, name); |
435 | } |
436 | |
437 | /* |
438 | * Initialize final note (needed for /proc/vmcore code) |
439 | */ |
440 | static void *nt_final(void *ptr) |
441 | { |
442 | Elf64_Nhdr *note; |
443 | |
444 | note = (Elf64_Nhdr *) ptr; |
445 | note->n_namesz = 0; |
446 | note->n_descsz = 0; |
447 | note->n_type = 0; |
448 | return PTR_ADD(ptr, sizeof(Elf64_Nhdr)); |
449 | } |
450 | |
451 | /* |
452 | * Initialize ELF header (new kernel) |
453 | */ |
454 | static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt) |
455 | { |
456 | memset(ehdr, 0, sizeof(*ehdr)); |
457 | memcpy(ehdr->e_ident, ELFMAG, SELFMAG); |
458 | ehdr->e_ident[EI_CLASS] = ELFCLASS64; |
459 | ehdr->e_ident[EI_DATA] = ELFDATA2MSB; |
460 | ehdr->e_ident[EI_VERSION] = EV_CURRENT; |
461 | memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD); |
462 | ehdr->e_type = ET_CORE; |
463 | ehdr->e_machine = EM_S390; |
464 | ehdr->e_version = EV_CURRENT; |
465 | ehdr->e_phoff = sizeof(Elf64_Ehdr); |
466 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); |
467 | ehdr->e_phentsize = sizeof(Elf64_Phdr); |
468 | ehdr->e_phnum = mem_chunk_cnt + 1; |
469 | return ehdr + 1; |
470 | } |
471 | |
472 | /* |
473 | * Return CPU count for ELF header (new kernel) |
474 | */ |
475 | static int get_cpu_cnt(void) |
476 | { |
477 | struct save_area *sa; |
478 | int cpus = 0; |
479 | |
480 | list_for_each_entry(sa, &dump_save_areas, list) |
481 | if (sa->prefix != 0) |
482 | cpus++; |
483 | return cpus; |
484 | } |
485 | |
486 | /* |
487 | * Return memory chunk count for ELF header (new kernel) |
488 | */ |
489 | static int get_mem_chunk_cnt(void) |
490 | { |
491 | int cnt = 0; |
492 | u64 idx; |
493 | |
494 | for_each_physmem_range(idx, &oldmem_type, NULL, NULL) |
495 | cnt++; |
496 | return cnt; |
497 | } |
498 | |
499 | /* |
500 | * Initialize ELF loads (new kernel) |
501 | */ |
502 | static void loads_init(Elf64_Phdr *phdr) |
503 | { |
504 | phys_addr_t start, end; |
505 | u64 idx; |
506 | |
507 | for_each_physmem_range(idx, &oldmem_type, &start, &end) { |
508 | phdr->p_filesz = end - start; |
509 | phdr->p_type = PT_LOAD; |
510 | phdr->p_offset = start; |
511 | phdr->p_vaddr = (unsigned long)__va(start); |
512 | phdr->p_paddr = start; |
513 | phdr->p_memsz = end - start; |
514 | phdr->p_flags = PF_R | PF_W | PF_X; |
515 | phdr->p_align = PAGE_SIZE; |
516 | phdr++; |
517 | } |
518 | } |
519 | |
520 | /* |
521 | * Initialize notes (new kernel) |
522 | */ |
523 | static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset) |
524 | { |
525 | struct save_area *sa; |
526 | void *ptr_start = ptr; |
527 | int cpu; |
528 | |
529 | ptr = nt_prpsinfo(ptr); |
530 | |
531 | cpu = 1; |
532 | list_for_each_entry(sa, &dump_save_areas, list) |
533 | if (sa->prefix != 0) |
534 | ptr = fill_cpu_elf_notes(ptr, cpu: cpu++, sa); |
535 | ptr = nt_vmcoreinfo(ptr); |
536 | ptr = nt_final(ptr); |
537 | memset(phdr, 0, sizeof(*phdr)); |
538 | phdr->p_type = PT_NOTE; |
539 | phdr->p_offset = notes_offset; |
540 | phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start); |
541 | phdr->p_memsz = phdr->p_filesz; |
542 | return ptr; |
543 | } |
544 | |
545 | static size_t get_elfcorehdr_size(int mem_chunk_cnt) |
546 | { |
547 | size_t size; |
548 | |
549 | size = sizeof(Elf64_Ehdr); |
550 | /* PT_NOTES */ |
551 | size += sizeof(Elf64_Phdr); |
552 | /* nt_prpsinfo */ |
553 | size += nt_size(NT_PRPSINFO, d_len: sizeof(struct elf_prpsinfo)); |
554 | /* regsets */ |
555 | size += get_cpu_cnt() * get_cpu_elf_notes_size(); |
556 | /* nt_vmcoreinfo */ |
557 | size += nt_vmcoreinfo_size(); |
558 | /* nt_final */ |
559 | size += sizeof(Elf64_Nhdr); |
560 | /* PT_LOADS */ |
561 | size += mem_chunk_cnt * sizeof(Elf64_Phdr); |
562 | |
563 | return size; |
564 | } |
565 | |
566 | /* |
567 | * Create ELF core header (new kernel) |
568 | */ |
569 | int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) |
570 | { |
571 | Elf64_Phdr *phdr_notes, *phdr_loads; |
572 | size_t alloc_size; |
573 | int mem_chunk_cnt; |
574 | void *ptr, *hdr; |
575 | u64 hdr_off; |
576 | |
577 | /* If we are not in kdump or zfcp/nvme dump mode return */ |
578 | if (!oldmem_data.start && !is_ipl_type_dump()) |
579 | return 0; |
580 | /* If we cannot get HSA size for zfcp/nvme dump return error */ |
581 | if (is_ipl_type_dump() && !sclp.hsa_size) |
582 | return -ENODEV; |
583 | |
584 | /* For kdump, exclude previous crashkernel memory */ |
585 | if (oldmem_data.start) { |
586 | oldmem_region.base = oldmem_data.start; |
587 | oldmem_region.size = oldmem_data.size; |
588 | oldmem_type.total_size = oldmem_data.size; |
589 | } |
590 | |
591 | mem_chunk_cnt = get_mem_chunk_cnt(); |
592 | |
593 | alloc_size = get_elfcorehdr_size(mem_chunk_cnt); |
594 | |
595 | hdr = kzalloc(size: alloc_size, GFP_KERNEL); |
596 | |
597 | /* Without elfcorehdr /proc/vmcore cannot be created. Thus creating |
598 | * a dump with this crash kernel will fail. Panic now to allow other |
599 | * dump mechanisms to take over. |
600 | */ |
601 | if (!hdr) |
602 | panic(fmt: "s390 kdump allocating elfcorehdr failed" ); |
603 | |
604 | /* Init elf header */ |
605 | ptr = ehdr_init(ehdr: hdr, mem_chunk_cnt); |
606 | /* Init program headers */ |
607 | phdr_notes = ptr; |
608 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr)); |
609 | phdr_loads = ptr; |
610 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt); |
611 | /* Init notes */ |
612 | hdr_off = PTR_DIFF(ptr, hdr); |
613 | ptr = notes_init(phdr: phdr_notes, ptr, notes_offset: ((unsigned long) hdr) + hdr_off); |
614 | /* Init loads */ |
615 | hdr_off = PTR_DIFF(ptr, hdr); |
616 | loads_init(phdr: phdr_loads); |
617 | *addr = (unsigned long long) hdr; |
618 | *size = (unsigned long long) hdr_off; |
619 | BUG_ON(elfcorehdr_size > alloc_size); |
620 | return 0; |
621 | } |
622 | |
623 | /* |
624 | * Free ELF core header (new kernel) |
625 | */ |
626 | void elfcorehdr_free(unsigned long long addr) |
627 | { |
628 | kfree(objp: (void *)(unsigned long)addr); |
629 | } |
630 | |
631 | /* |
632 | * Read from ELF header |
633 | */ |
634 | ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos) |
635 | { |
636 | void *src = (void *)(unsigned long)*ppos; |
637 | |
638 | memcpy(buf, src, count); |
639 | *ppos += count; |
640 | return count; |
641 | } |
642 | |
643 | /* |
644 | * Read from ELF notes data |
645 | */ |
646 | ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos) |
647 | { |
648 | void *src = (void *)(unsigned long)*ppos; |
649 | |
650 | memcpy(buf, src, count); |
651 | *ppos += count; |
652 | return count; |
653 | } |
654 | |