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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> | |
50be6345 | 16 | #include <linux/memblock.h> |
4857d4bb | 17 | #include <asm/os_info.h> |
6b563d8c HC |
18 | #include <asm/elf.h> |
19 | #include <asm/ipl.h> | |
6f79d332 | 20 | #include <asm/sclp.h> |
60a0c68d MH |
21 | |
22 | #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) | |
23 | #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) | |
24 | #define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y)))) | |
25 | ||
50be6345 PH |
26 | static struct memblock_region oldmem_region; |
27 | ||
28 | static struct memblock_type oldmem_type = { | |
29 | .cnt = 1, | |
30 | .max = 1, | |
31 | .total_size = 0, | |
32 | .regions = &oldmem_region, | |
33 | }; | |
34 | ||
35 | #define for_each_dump_mem_range(i, nid, p_start, p_end, p_nid) \ | |
36 | for (i = 0, __next_mem_range(&i, nid, &memblock.physmem, \ | |
37 | &oldmem_type, p_start, \ | |
38 | p_end, p_nid); \ | |
39 | i != (u64)ULLONG_MAX; \ | |
40 | __next_mem_range(&i, nid, &memblock.physmem, \ | |
41 | &oldmem_type, \ | |
42 | p_start, p_end, p_nid)) | |
43 | ||
58952942 MH |
44 | struct dump_save_areas dump_save_areas; |
45 | ||
46 | /* | |
47 | * Allocate and add a save area for a CPU | |
48 | */ | |
a62bc073 | 49 | struct save_area_ext *dump_save_area_create(int cpu) |
58952942 | 50 | { |
a62bc073 | 51 | struct save_area_ext **save_areas, *save_area; |
58952942 MH |
52 | |
53 | save_area = kmalloc(sizeof(*save_area), GFP_KERNEL); | |
54 | if (!save_area) | |
55 | return NULL; | |
56 | if (cpu + 1 > dump_save_areas.count) { | |
57 | dump_save_areas.count = cpu + 1; | |
58 | save_areas = krealloc(dump_save_areas.areas, | |
59 | dump_save_areas.count * sizeof(void *), | |
60 | GFP_KERNEL | __GFP_ZERO); | |
61 | if (!save_areas) { | |
62 | kfree(save_area); | |
63 | return NULL; | |
64 | } | |
65 | dump_save_areas.areas = save_areas; | |
66 | } | |
67 | dump_save_areas.areas[cpu] = save_area; | |
68 | return save_area; | |
69 | } | |
191a2fa0 MH |
70 | |
71 | /* | |
72 | * Return physical address for virtual address | |
73 | */ | |
74 | static inline void *load_real_addr(void *addr) | |
75 | { | |
76 | unsigned long real_addr; | |
77 | ||
78 | asm volatile( | |
79 | " lra %0,0(%1)\n" | |
80 | " jz 0f\n" | |
81 | " la %0,0\n" | |
82 | "0:" | |
83 | : "=a" (real_addr) : "a" (addr) : "cc"); | |
84 | return (void *)real_addr; | |
85 | } | |
86 | ||
87 | /* | |
4d3b0664 | 88 | * Copy real to virtual or real memory |
191a2fa0 | 89 | */ |
4d3b0664 | 90 | static int copy_from_realmem(void *dest, void *src, size_t count) |
191a2fa0 | 91 | { |
4d3b0664 | 92 | unsigned long size; |
4d3b0664 MH |
93 | |
94 | if (!count) | |
95 | return 0; | |
96 | if (!is_vmalloc_or_module_addr(dest)) | |
97 | return memcpy_real(dest, src, count); | |
98 | do { | |
99 | size = min(count, PAGE_SIZE - (__pa(dest) & ~PAGE_MASK)); | |
100 | if (memcpy_real(load_real_addr(dest), src, size)) | |
101 | return -EFAULT; | |
102 | count -= size; | |
103 | dest += size; | |
104 | src += size; | |
105 | } while (count); | |
106 | return 0; | |
191a2fa0 MH |
107 | } |
108 | ||
97b0f6f9 MH |
109 | /* |
110 | * Pointer to ELF header in new kernel | |
111 | */ | |
112 | static void *elfcorehdr_newmem; | |
113 | ||
60a0c68d | 114 | /* |
6f79d332 MH |
115 | * Copy one page from zfcpdump "oldmem" |
116 | * | |
e657d8fe | 117 | * For pages below HSA size memory from the HSA is copied. Otherwise |
6f79d332 MH |
118 | * real memory copy is used. |
119 | */ | |
120 | static ssize_t copy_oldmem_page_zfcpdump(char *buf, size_t csize, | |
121 | unsigned long src, int userbuf) | |
122 | { | |
123 | int rc; | |
124 | ||
37c5f6c8 | 125 | if (src < sclp.hsa_size) { |
6f79d332 MH |
126 | rc = memcpy_hsa(buf, src, csize, userbuf); |
127 | } else { | |
128 | if (userbuf) | |
129 | rc = copy_to_user_real((void __force __user *) buf, | |
130 | (void *) src, csize); | |
131 | else | |
132 | rc = memcpy_real(buf, (void *) src, csize); | |
133 | } | |
134 | return rc ? rc : csize; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Copy one page from kdump "oldmem" | |
60a0c68d MH |
139 | * |
140 | * For the kdump reserved memory this functions performs a swap operation: | |
141 | * - [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] is mapped to [0 - OLDMEM_SIZE]. | |
142 | * - [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] | |
143 | */ | |
6f79d332 MH |
144 | static ssize_t copy_oldmem_page_kdump(char *buf, size_t csize, |
145 | unsigned long src, int userbuf) | |
146 | ||
60a0c68d | 147 | { |
191a2fa0 | 148 | int rc; |
60a0c68d | 149 | |
60a0c68d MH |
150 | if (src < OLDMEM_SIZE) |
151 | src += OLDMEM_BASE; | |
152 | else if (src > OLDMEM_BASE && | |
153 | src < OLDMEM_BASE + OLDMEM_SIZE) | |
154 | src -= OLDMEM_BASE; | |
155 | if (userbuf) | |
191a2fa0 MH |
156 | rc = copy_to_user_real((void __force __user *) buf, |
157 | (void *) src, csize); | |
60a0c68d | 158 | else |
4d3b0664 | 159 | rc = copy_from_realmem(buf, (void *) src, csize); |
6f79d332 MH |
160 | return (rc == 0) ? rc : csize; |
161 | } | |
162 | ||
163 | /* | |
164 | * Copy one page from "oldmem" | |
165 | */ | |
166 | ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, | |
167 | unsigned long offset, int userbuf) | |
168 | { | |
169 | unsigned long src; | |
170 | ||
171 | if (!csize) | |
172 | return 0; | |
173 | src = (pfn << PAGE_SHIFT) + offset; | |
174 | if (OLDMEM_BASE) | |
175 | return copy_oldmem_page_kdump(buf, csize, src, userbuf); | |
176 | else | |
177 | return copy_oldmem_page_zfcpdump(buf, csize, src, userbuf); | |
60a0c68d MH |
178 | } |
179 | ||
23df79da | 180 | /* |
6f79d332 | 181 | * Remap "oldmem" for kdump |
23df79da JW |
182 | * |
183 | * For the kdump reserved memory this functions performs a swap operation: | |
184 | * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] | |
185 | */ | |
6f79d332 MH |
186 | static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma, |
187 | unsigned long from, unsigned long pfn, | |
188 | unsigned long size, pgprot_t prot) | |
23df79da JW |
189 | { |
190 | unsigned long size_old; | |
191 | int rc; | |
192 | ||
193 | if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) { | |
194 | size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT)); | |
195 | rc = remap_pfn_range(vma, from, | |
196 | pfn + (OLDMEM_BASE >> PAGE_SHIFT), | |
197 | size_old, prot); | |
198 | if (rc || size == size_old) | |
199 | return rc; | |
200 | size -= size_old; | |
201 | from += size_old; | |
202 | pfn += size_old >> PAGE_SHIFT; | |
203 | } | |
204 | return remap_pfn_range(vma, from, pfn, size, prot); | |
205 | } | |
206 | ||
6f79d332 MH |
207 | /* |
208 | * Remap "oldmem" for zfcpdump | |
209 | * | |
e657d8fe MH |
210 | * We only map available memory above HSA size. Memory below HSA size |
211 | * is read on demand using the copy_oldmem_page() function. | |
6f79d332 MH |
212 | */ |
213 | static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma, | |
214 | unsigned long from, | |
215 | unsigned long pfn, | |
216 | unsigned long size, pgprot_t prot) | |
217 | { | |
37c5f6c8 | 218 | unsigned long hsa_end = sclp.hsa_size; |
6f79d332 MH |
219 | unsigned long size_hsa; |
220 | ||
e657d8fe MH |
221 | if (pfn < hsa_end >> PAGE_SHIFT) { |
222 | size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT)); | |
6f79d332 MH |
223 | if (size == size_hsa) |
224 | return 0; | |
225 | size -= size_hsa; | |
226 | from += size_hsa; | |
227 | pfn += size_hsa >> PAGE_SHIFT; | |
228 | } | |
229 | return remap_pfn_range(vma, from, pfn, size, prot); | |
230 | } | |
231 | ||
232 | /* | |
233 | * Remap "oldmem" for kdump or zfcpdump | |
234 | */ | |
235 | int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, | |
236 | unsigned long pfn, unsigned long size, pgprot_t prot) | |
237 | { | |
238 | if (OLDMEM_BASE) | |
239 | return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot); | |
240 | else | |
241 | return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size, | |
242 | prot); | |
243 | } | |
244 | ||
60a0c68d MH |
245 | /* |
246 | * Copy memory from old kernel | |
247 | */ | |
4857d4bb | 248 | int copy_from_oldmem(void *dest, void *src, size_t count) |
60a0c68d MH |
249 | { |
250 | unsigned long copied = 0; | |
251 | int rc; | |
252 | ||
6f79d332 MH |
253 | if (OLDMEM_BASE) { |
254 | if ((unsigned long) src < OLDMEM_SIZE) { | |
255 | copied = min(count, OLDMEM_SIZE - (unsigned long) src); | |
4d3b0664 | 256 | rc = copy_from_realmem(dest, src + OLDMEM_BASE, copied); |
6f79d332 MH |
257 | if (rc) |
258 | return rc; | |
259 | } | |
260 | } else { | |
37c5f6c8 | 261 | unsigned long hsa_end = sclp.hsa_size; |
e657d8fe MH |
262 | if ((unsigned long) src < hsa_end) { |
263 | copied = min(count, hsa_end - (unsigned long) src); | |
6f79d332 MH |
264 | rc = memcpy_hsa(dest, (unsigned long) src, copied, 0); |
265 | if (rc) | |
266 | return rc; | |
267 | } | |
60a0c68d | 268 | } |
4d3b0664 | 269 | return copy_from_realmem(dest + copied, src + copied, count - copied); |
60a0c68d MH |
270 | } |
271 | ||
272 | /* | |
273 | * Alloc memory and panic in case of ENOMEM | |
274 | */ | |
275 | static void *kzalloc_panic(int len) | |
276 | { | |
277 | void *rc; | |
278 | ||
279 | rc = kzalloc(len, GFP_KERNEL); | |
280 | if (!rc) | |
281 | panic("s390 kdump kzalloc (%d) failed", len); | |
282 | return rc; | |
283 | } | |
284 | ||
60a0c68d MH |
285 | /* |
286 | * Initialize ELF note | |
287 | */ | |
288 | static void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len, | |
289 | const char *name) | |
290 | { | |
291 | Elf64_Nhdr *note; | |
292 | u64 len; | |
293 | ||
294 | note = (Elf64_Nhdr *)buf; | |
295 | note->n_namesz = strlen(name) + 1; | |
296 | note->n_descsz = d_len; | |
297 | note->n_type = type; | |
298 | len = sizeof(Elf64_Nhdr); | |
299 | ||
300 | memcpy(buf + len, name, note->n_namesz); | |
301 | len = roundup(len + note->n_namesz, 4); | |
302 | ||
303 | memcpy(buf + len, desc, note->n_descsz); | |
304 | len = roundup(len + note->n_descsz, 4); | |
305 | ||
306 | return PTR_ADD(buf, len); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Initialize prstatus note | |
311 | */ | |
312 | static void *nt_prstatus(void *ptr, struct save_area *sa) | |
313 | { | |
314 | struct elf_prstatus nt_prstatus; | |
315 | static int cpu_nr = 1; | |
316 | ||
317 | memset(&nt_prstatus, 0, sizeof(nt_prstatus)); | |
318 | memcpy(&nt_prstatus.pr_reg.gprs, sa->gp_regs, sizeof(sa->gp_regs)); | |
319 | memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw)); | |
320 | memcpy(&nt_prstatus.pr_reg.acrs, sa->acc_regs, sizeof(sa->acc_regs)); | |
321 | nt_prstatus.pr_pid = cpu_nr; | |
322 | cpu_nr++; | |
323 | ||
324 | return nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus), | |
325 | "CORE"); | |
326 | } | |
327 | ||
328 | /* | |
329 | * Initialize fpregset (floating point) note | |
330 | */ | |
331 | static void *nt_fpregset(void *ptr, struct save_area *sa) | |
332 | { | |
333 | elf_fpregset_t nt_fpregset; | |
334 | ||
335 | memset(&nt_fpregset, 0, sizeof(nt_fpregset)); | |
336 | memcpy(&nt_fpregset.fpc, &sa->fp_ctrl_reg, sizeof(sa->fp_ctrl_reg)); | |
337 | memcpy(&nt_fpregset.fprs, &sa->fp_regs, sizeof(sa->fp_regs)); | |
338 | ||
339 | return nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset), | |
340 | "CORE"); | |
341 | } | |
342 | ||
343 | /* | |
344 | * Initialize timer note | |
345 | */ | |
346 | static void *nt_s390_timer(void *ptr, struct save_area *sa) | |
347 | { | |
348 | return nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer), | |
349 | KEXEC_CORE_NOTE_NAME); | |
350 | } | |
351 | ||
352 | /* | |
353 | * Initialize TOD clock comparator note | |
354 | */ | |
355 | static void *nt_s390_tod_cmp(void *ptr, struct save_area *sa) | |
356 | { | |
357 | return nt_init(ptr, NT_S390_TODCMP, &sa->clk_cmp, | |
358 | sizeof(sa->clk_cmp), KEXEC_CORE_NOTE_NAME); | |
359 | } | |
360 | ||
361 | /* | |
362 | * Initialize TOD programmable register note | |
363 | */ | |
364 | static void *nt_s390_tod_preg(void *ptr, struct save_area *sa) | |
365 | { | |
366 | return nt_init(ptr, NT_S390_TODPREG, &sa->tod_reg, | |
367 | sizeof(sa->tod_reg), KEXEC_CORE_NOTE_NAME); | |
368 | } | |
369 | ||
370 | /* | |
371 | * Initialize control register note | |
372 | */ | |
373 | static void *nt_s390_ctrs(void *ptr, struct save_area *sa) | |
374 | { | |
375 | return nt_init(ptr, NT_S390_CTRS, &sa->ctrl_regs, | |
376 | sizeof(sa->ctrl_regs), KEXEC_CORE_NOTE_NAME); | |
377 | } | |
378 | ||
379 | /* | |
380 | * Initialize prefix register note | |
381 | */ | |
382 | static void *nt_s390_prefix(void *ptr, struct save_area *sa) | |
383 | { | |
384 | return nt_init(ptr, NT_S390_PREFIX, &sa->pref_reg, | |
385 | sizeof(sa->pref_reg), KEXEC_CORE_NOTE_NAME); | |
386 | } | |
387 | ||
a62bc073 MH |
388 | /* |
389 | * Initialize vxrs high note (full 128 bit VX registers 16-31) | |
390 | */ | |
391 | static void *nt_s390_vx_high(void *ptr, __vector128 *vx_regs) | |
392 | { | |
393 | return nt_init(ptr, NT_S390_VXRS_HIGH, &vx_regs[16], | |
394 | 16 * sizeof(__vector128), KEXEC_CORE_NOTE_NAME); | |
395 | } | |
396 | ||
397 | /* | |
398 | * Initialize vxrs low note (lower halves of VX registers 0-15) | |
399 | */ | |
400 | static void *nt_s390_vx_low(void *ptr, __vector128 *vx_regs) | |
401 | { | |
402 | Elf64_Nhdr *note; | |
403 | u64 len; | |
404 | int i; | |
405 | ||
406 | note = (Elf64_Nhdr *)ptr; | |
407 | note->n_namesz = strlen(KEXEC_CORE_NOTE_NAME) + 1; | |
408 | note->n_descsz = 16 * 8; | |
409 | note->n_type = NT_S390_VXRS_LOW; | |
410 | len = sizeof(Elf64_Nhdr); | |
411 | ||
412 | memcpy(ptr + len, KEXEC_CORE_NOTE_NAME, note->n_namesz); | |
413 | len = roundup(len + note->n_namesz, 4); | |
414 | ||
415 | ptr += len; | |
416 | /* Copy lower halves of SIMD registers 0-15 */ | |
417 | for (i = 0; i < 16; i++) { | |
418 | memcpy(ptr, &vx_regs[i], 8); | |
419 | ptr += 8; | |
420 | } | |
421 | return ptr; | |
422 | } | |
423 | ||
60a0c68d MH |
424 | /* |
425 | * Fill ELF notes for one CPU with save area registers | |
426 | */ | |
a62bc073 | 427 | void *fill_cpu_elf_notes(void *ptr, struct save_area *sa, __vector128 *vx_regs) |
60a0c68d MH |
428 | { |
429 | ptr = nt_prstatus(ptr, sa); | |
430 | ptr = nt_fpregset(ptr, sa); | |
431 | ptr = nt_s390_timer(ptr, sa); | |
432 | ptr = nt_s390_tod_cmp(ptr, sa); | |
433 | ptr = nt_s390_tod_preg(ptr, sa); | |
434 | ptr = nt_s390_ctrs(ptr, sa); | |
435 | ptr = nt_s390_prefix(ptr, sa); | |
a62bc073 MH |
436 | if (MACHINE_HAS_VX && vx_regs) { |
437 | ptr = nt_s390_vx_low(ptr, vx_regs); | |
438 | ptr = nt_s390_vx_high(ptr, vx_regs); | |
439 | } | |
60a0c68d MH |
440 | return ptr; |
441 | } | |
442 | ||
443 | /* | |
444 | * Initialize prpsinfo note (new kernel) | |
445 | */ | |
446 | static void *nt_prpsinfo(void *ptr) | |
447 | { | |
448 | struct elf_prpsinfo prpsinfo; | |
449 | ||
450 | memset(&prpsinfo, 0, sizeof(prpsinfo)); | |
451 | prpsinfo.pr_sname = 'R'; | |
452 | strcpy(prpsinfo.pr_fname, "vmlinux"); | |
453 | return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo), | |
454 | KEXEC_CORE_NOTE_NAME); | |
455 | } | |
456 | ||
457 | /* | |
4857d4bb | 458 | * Get vmcoreinfo using lowcore->vmcore_info (new kernel) |
60a0c68d | 459 | */ |
4857d4bb | 460 | static void *get_vmcoreinfo_old(unsigned long *size) |
60a0c68d MH |
461 | { |
462 | char nt_name[11], *vmcoreinfo; | |
463 | Elf64_Nhdr note; | |
464 | void *addr; | |
465 | ||
466 | if (copy_from_oldmem(&addr, &S390_lowcore.vmcore_info, sizeof(addr))) | |
4857d4bb | 467 | return NULL; |
60a0c68d MH |
468 | memset(nt_name, 0, sizeof(nt_name)); |
469 | if (copy_from_oldmem(¬e, addr, sizeof(note))) | |
4857d4bb | 470 | return NULL; |
60a0c68d | 471 | if (copy_from_oldmem(nt_name, addr + sizeof(note), sizeof(nt_name) - 1)) |
4857d4bb | 472 | return NULL; |
60a0c68d | 473 | if (strcmp(nt_name, "VMCOREINFO") != 0) |
4857d4bb MH |
474 | return NULL; |
475 | vmcoreinfo = kzalloc_panic(note.n_descsz); | |
60a0c68d | 476 | if (copy_from_oldmem(vmcoreinfo, addr + 24, note.n_descsz)) |
4857d4bb MH |
477 | return NULL; |
478 | *size = note.n_descsz; | |
479 | return vmcoreinfo; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Initialize vmcoreinfo note (new kernel) | |
484 | */ | |
485 | static void *nt_vmcoreinfo(void *ptr) | |
486 | { | |
487 | unsigned long size; | |
488 | void *vmcoreinfo; | |
489 | ||
490 | vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size); | |
491 | if (!vmcoreinfo) | |
492 | vmcoreinfo = get_vmcoreinfo_old(&size); | |
493 | if (!vmcoreinfo) | |
60a0c68d | 494 | return ptr; |
4857d4bb | 495 | return nt_init(ptr, 0, vmcoreinfo, size, "VMCOREINFO"); |
60a0c68d MH |
496 | } |
497 | ||
498 | /* | |
499 | * Initialize ELF header (new kernel) | |
500 | */ | |
501 | static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt) | |
502 | { | |
503 | memset(ehdr, 0, sizeof(*ehdr)); | |
504 | memcpy(ehdr->e_ident, ELFMAG, SELFMAG); | |
505 | ehdr->e_ident[EI_CLASS] = ELFCLASS64; | |
506 | ehdr->e_ident[EI_DATA] = ELFDATA2MSB; | |
507 | ehdr->e_ident[EI_VERSION] = EV_CURRENT; | |
508 | memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD); | |
509 | ehdr->e_type = ET_CORE; | |
510 | ehdr->e_machine = EM_S390; | |
511 | ehdr->e_version = EV_CURRENT; | |
512 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
513 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
514 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
515 | ehdr->e_phnum = mem_chunk_cnt + 1; | |
516 | return ehdr + 1; | |
517 | } | |
518 | ||
519 | /* | |
520 | * Return CPU count for ELF header (new kernel) | |
521 | */ | |
522 | static int get_cpu_cnt(void) | |
523 | { | |
524 | int i, cpus = 0; | |
525 | ||
58952942 | 526 | for (i = 0; i < dump_save_areas.count; i++) { |
a62bc073 | 527 | if (dump_save_areas.areas[i]->sa.pref_reg == 0) |
60a0c68d MH |
528 | continue; |
529 | cpus++; | |
530 | } | |
531 | return cpus; | |
532 | } | |
533 | ||
534 | /* | |
535 | * Return memory chunk count for ELF header (new kernel) | |
536 | */ | |
537 | static int get_mem_chunk_cnt(void) | |
538 | { | |
50be6345 PH |
539 | int cnt = 0; |
540 | u64 idx; | |
541 | ||
542 | for_each_dump_mem_range(idx, NUMA_NO_NODE, NULL, NULL, NULL) | |
60a0c68d | 543 | cnt++; |
60a0c68d MH |
544 | return cnt; |
545 | } | |
546 | ||
60a0c68d MH |
547 | /* |
548 | * Initialize ELF loads (new kernel) | |
549 | */ | |
50be6345 | 550 | static void loads_init(Elf64_Phdr *phdr, u64 loads_offset) |
60a0c68d | 551 | { |
50be6345 PH |
552 | phys_addr_t start, end; |
553 | u64 idx; | |
60a0c68d | 554 | |
50be6345 PH |
555 | for_each_dump_mem_range(idx, NUMA_NO_NODE, &start, &end, NULL) { |
556 | phdr->p_filesz = end - start; | |
60a0c68d | 557 | phdr->p_type = PT_LOAD; |
50be6345 PH |
558 | phdr->p_offset = start; |
559 | phdr->p_vaddr = start; | |
560 | phdr->p_paddr = start; | |
561 | phdr->p_memsz = end - start; | |
60a0c68d MH |
562 | phdr->p_flags = PF_R | PF_W | PF_X; |
563 | phdr->p_align = PAGE_SIZE; | |
564 | phdr++; | |
565 | } | |
60a0c68d MH |
566 | } |
567 | ||
568 | /* | |
569 | * Initialize notes (new kernel) | |
570 | */ | |
571 | static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset) | |
572 | { | |
a62bc073 | 573 | struct save_area_ext *sa_ext; |
60a0c68d MH |
574 | void *ptr_start = ptr; |
575 | int i; | |
576 | ||
577 | ptr = nt_prpsinfo(ptr); | |
578 | ||
58952942 | 579 | for (i = 0; i < dump_save_areas.count; i++) { |
a62bc073 MH |
580 | sa_ext = dump_save_areas.areas[i]; |
581 | if (sa_ext->sa.pref_reg == 0) | |
60a0c68d | 582 | continue; |
a62bc073 | 583 | ptr = fill_cpu_elf_notes(ptr, &sa_ext->sa, sa_ext->vx_regs); |
60a0c68d MH |
584 | } |
585 | ptr = nt_vmcoreinfo(ptr); | |
586 | memset(phdr, 0, sizeof(*phdr)); | |
587 | phdr->p_type = PT_NOTE; | |
97b0f6f9 | 588 | phdr->p_offset = notes_offset; |
60a0c68d MH |
589 | phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start); |
590 | phdr->p_memsz = phdr->p_filesz; | |
591 | return ptr; | |
592 | } | |
593 | ||
594 | /* | |
595 | * Create ELF core header (new kernel) | |
596 | */ | |
97b0f6f9 | 597 | int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) |
60a0c68d MH |
598 | { |
599 | Elf64_Phdr *phdr_notes, *phdr_loads; | |
600 | int mem_chunk_cnt; | |
601 | void *ptr, *hdr; | |
602 | u32 alloc_size; | |
603 | u64 hdr_off; | |
604 | ||
6f79d332 MH |
605 | /* If we are not in kdump or zfcpdump mode return */ |
606 | if (!OLDMEM_BASE && ipl_info.type != IPL_TYPE_FCP_DUMP) | |
97b0f6f9 MH |
607 | return 0; |
608 | /* If elfcorehdr= has been passed via cmdline, we use that one */ | |
609 | if (elfcorehdr_addr != ELFCORE_ADDR_MAX) | |
610 | return 0; | |
e657d8fe | 611 | /* If we cannot get HSA size for zfcpdump return error */ |
37c5f6c8 | 612 | if (ipl_info.type == IPL_TYPE_FCP_DUMP && !sclp.hsa_size) |
e657d8fe | 613 | return -ENODEV; |
50be6345 PH |
614 | |
615 | /* For kdump, exclude previous crashkernel memory */ | |
616 | if (OLDMEM_BASE) { | |
617 | oldmem_region.base = OLDMEM_BASE; | |
618 | oldmem_region.size = OLDMEM_SIZE; | |
619 | oldmem_type.total_size = OLDMEM_SIZE; | |
620 | } | |
621 | ||
60a0c68d MH |
622 | mem_chunk_cnt = get_mem_chunk_cnt(); |
623 | ||
a62bc073 | 624 | alloc_size = 0x1000 + get_cpu_cnt() * 0x4a0 + |
60a0c68d MH |
625 | mem_chunk_cnt * sizeof(Elf64_Phdr); |
626 | hdr = kzalloc_panic(alloc_size); | |
627 | /* Init elf header */ | |
628 | ptr = ehdr_init(hdr, mem_chunk_cnt); | |
629 | /* Init program headers */ | |
630 | phdr_notes = ptr; | |
631 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr)); | |
632 | phdr_loads = ptr; | |
633 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt); | |
634 | /* Init notes */ | |
635 | hdr_off = PTR_DIFF(ptr, hdr); | |
636 | ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off); | |
637 | /* Init loads */ | |
638 | hdr_off = PTR_DIFF(ptr, hdr); | |
97b0f6f9 MH |
639 | loads_init(phdr_loads, hdr_off); |
640 | *addr = (unsigned long long) hdr; | |
641 | elfcorehdr_newmem = hdr; | |
642 | *size = (unsigned long long) hdr_off; | |
643 | BUG_ON(elfcorehdr_size > alloc_size); | |
644 | return 0; | |
60a0c68d MH |
645 | } |
646 | ||
647 | /* | |
97b0f6f9 | 648 | * Free ELF core header (new kernel) |
60a0c68d | 649 | */ |
97b0f6f9 | 650 | void elfcorehdr_free(unsigned long long addr) |
60a0c68d | 651 | { |
97b0f6f9 MH |
652 | if (!elfcorehdr_newmem) |
653 | return; | |
654 | kfree((void *)(unsigned long)addr); | |
655 | } | |
656 | ||
657 | /* | |
658 | * Read from ELF header | |
659 | */ | |
660 | ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos) | |
661 | { | |
662 | void *src = (void *)(unsigned long)*ppos; | |
663 | ||
664 | src = elfcorehdr_newmem ? src : src - OLDMEM_BASE; | |
665 | memcpy(buf, src, count); | |
666 | *ppos += count; | |
667 | return count; | |
60a0c68d MH |
668 | } |
669 | ||
97b0f6f9 MH |
670 | /* |
671 | * Read from ELF notes data | |
672 | */ | |
673 | ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos) | |
674 | { | |
675 | void *src = (void *)(unsigned long)*ppos; | |
676 | int rc; | |
677 | ||
678 | if (elfcorehdr_newmem) { | |
679 | memcpy(buf, src, count); | |
680 | } else { | |
681 | rc = copy_from_oldmem(buf, src, count); | |
682 | if (rc) | |
683 | return rc; | |
684 | } | |
685 | *ppos += count; | |
686 | return count; | |
687 | } |