Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
60a0c68d MH |
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> | |
3994a52b PG |
12 | #include <linux/init.h> |
13 | #include <linux/mm.h> | |
60a0c68d MH |
14 | #include <linux/gfp.h> |
15 | #include <linux/slab.h> | |
60a0c68d MH |
16 | #include <linux/bootmem.h> |
17 | #include <linux/elf.h> | |
1a2c5840 | 18 | #include <asm/asm-offsets.h> |
50be6345 | 19 | #include <linux/memblock.h> |
4857d4bb | 20 | #include <asm/os_info.h> |
6b563d8c HC |
21 | #include <asm/elf.h> |
22 | #include <asm/ipl.h> | |
6f79d332 | 23 | #include <asm/sclp.h> |
60a0c68d MH |
24 | |
25 | #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) | |
26 | #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) | |
27 | #define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y)))) | |
28 | ||
50be6345 PH |
29 | static struct memblock_region oldmem_region; |
30 | ||
31 | static struct memblock_type oldmem_type = { | |
32 | .cnt = 1, | |
33 | .max = 1, | |
34 | .total_size = 0, | |
35 | .regions = &oldmem_region, | |
0262d9c8 | 36 | .name = "oldmem", |
50be6345 PH |
37 | }; |
38 | ||
1a2c5840 MS |
39 | struct save_area { |
40 | struct list_head list; | |
41 | u64 psw[2]; | |
42 | u64 ctrs[16]; | |
43 | u64 gprs[16]; | |
44 | u32 acrs[16]; | |
45 | u64 fprs[16]; | |
46 | u32 fpc; | |
47 | u32 prefix; | |
48 | u64 todpreg; | |
49 | u64 timer; | |
50 | u64 todcmp; | |
51 | u64 vxrs_low[16]; | |
52 | __vector128 vxrs_high[16]; | |
53 | }; | |
54 | ||
55 | static LIST_HEAD(dump_save_areas); | |
56 | ||
57 | /* | |
58 | * Allocate a save area | |
59 | */ | |
60 | struct save_area * __init save_area_alloc(bool is_boot_cpu) | |
61 | { | |
62 | struct save_area *sa; | |
63 | ||
64 | sa = (void *) memblock_alloc(sizeof(*sa), 8); | |
1a2c5840 MS |
65 | if (is_boot_cpu) |
66 | list_add(&sa->list, &dump_save_areas); | |
67 | else | |
68 | list_add_tail(&sa->list, &dump_save_areas); | |
69 | return sa; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Return the address of the save area for the boot CPU | |
74 | */ | |
75 | struct save_area * __init save_area_boot_cpu(void) | |
76 | { | |
f296190e | 77 | return list_first_entry_or_null(&dump_save_areas, struct save_area, list); |
1a2c5840 MS |
78 | } |
79 | ||
80 | /* | |
81 | * Copy CPU registers into the save area | |
82 | */ | |
83 | void __init save_area_add_regs(struct save_area *sa, void *regs) | |
84 | { | |
c667aeac | 85 | struct lowcore *lc; |
1a2c5840 | 86 | |
c667aeac | 87 | lc = (struct lowcore *)(regs - __LC_FPREGS_SAVE_AREA); |
1a2c5840 MS |
88 | memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw)); |
89 | memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs)); | |
90 | memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs)); | |
91 | memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs)); | |
92 | memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs)); | |
93 | memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc)); | |
94 | memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix)); | |
95 | memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg)); | |
96 | memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer)); | |
97 | memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp)); | |
98 | } | |
99 | ||
100 | /* | |
101 | * Copy vector registers into the save area | |
102 | */ | |
103 | void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs) | |
104 | { | |
105 | int i; | |
106 | ||
107 | /* Copy lower halves of vector registers 0-15 */ | |
108 | for (i = 0; i < 16; i++) | |
109 | memcpy(&sa->vxrs_low[i], &vxrs[i].u[2], 8); | |
110 | /* Copy vector registers 16-31 */ | |
111 | memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128)); | |
112 | } | |
58952942 | 113 | |
191a2fa0 MH |
114 | /* |
115 | * Return physical address for virtual address | |
116 | */ | |
117 | static inline void *load_real_addr(void *addr) | |
118 | { | |
119 | unsigned long real_addr; | |
120 | ||
121 | asm volatile( | |
122 | " lra %0,0(%1)\n" | |
123 | " jz 0f\n" | |
124 | " la %0,0\n" | |
125 | "0:" | |
126 | : "=a" (real_addr) : "a" (addr) : "cc"); | |
127 | return (void *)real_addr; | |
128 | } | |
129 | ||
130 | /* | |
df9694c7 | 131 | * Copy memory of the old, dumped system to a kernel space virtual address |
191a2fa0 | 132 | */ |
df9694c7 | 133 | int copy_oldmem_kernel(void *dst, void *src, size_t count) |
6f79d332 | 134 | { |
df9694c7 MS |
135 | unsigned long from, len; |
136 | void *ra; | |
6f79d332 MH |
137 | int rc; |
138 | ||
df9694c7 MS |
139 | while (count) { |
140 | from = __pa(src); | |
141 | if (!OLDMEM_BASE && from < sclp.hsa_size) { | |
142 | /* Copy from zfcpdump HSA area */ | |
143 | len = min(count, sclp.hsa_size - from); | |
144 | rc = memcpy_hsa_kernel(dst, from, len); | |
145 | if (rc) | |
146 | return rc; | |
147 | } else { | |
148 | /* Check for swapped kdump oldmem areas */ | |
149 | if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) { | |
150 | from -= OLDMEM_BASE; | |
151 | len = min(count, OLDMEM_SIZE - from); | |
152 | } else if (OLDMEM_BASE && from < OLDMEM_SIZE) { | |
153 | len = min(count, OLDMEM_SIZE - from); | |
154 | from += OLDMEM_BASE; | |
155 | } else { | |
156 | len = count; | |
157 | } | |
158 | if (is_vmalloc_or_module_addr(dst)) { | |
159 | ra = load_real_addr(dst); | |
160 | len = min(PAGE_SIZE - offset_in_page(ra), len); | |
161 | } else { | |
162 | ra = dst; | |
163 | } | |
164 | if (memcpy_real(ra, (void *) from, len)) | |
165 | return -EFAULT; | |
166 | } | |
167 | dst += len; | |
168 | src += len; | |
169 | count -= len; | |
6f79d332 | 170 | } |
df9694c7 | 171 | return 0; |
6f79d332 MH |
172 | } |
173 | ||
174 | /* | |
df9694c7 | 175 | * Copy memory of the old, dumped system to a user space virtual address |
60a0c68d | 176 | */ |
f70a34c5 | 177 | static int copy_oldmem_user(void __user *dst, void *src, size_t count) |
60a0c68d | 178 | { |
df9694c7 | 179 | unsigned long from, len; |
191a2fa0 | 180 | int rc; |
60a0c68d | 181 | |
df9694c7 MS |
182 | while (count) { |
183 | from = __pa(src); | |
184 | if (!OLDMEM_BASE && from < sclp.hsa_size) { | |
185 | /* Copy from zfcpdump HSA area */ | |
186 | len = min(count, sclp.hsa_size - from); | |
187 | rc = memcpy_hsa_user(dst, from, len); | |
188 | if (rc) | |
189 | return rc; | |
190 | } else { | |
191 | /* Check for swapped kdump oldmem areas */ | |
192 | if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) { | |
193 | from -= OLDMEM_BASE; | |
194 | len = min(count, OLDMEM_SIZE - from); | |
195 | } else if (OLDMEM_BASE && from < OLDMEM_SIZE) { | |
196 | len = min(count, OLDMEM_SIZE - from); | |
197 | from += OLDMEM_BASE; | |
198 | } else { | |
199 | len = count; | |
200 | } | |
201 | rc = copy_to_user_real(dst, (void *) from, count); | |
202 | if (rc) | |
203 | return rc; | |
204 | } | |
205 | dst += len; | |
206 | src += len; | |
207 | count -= len; | |
208 | } | |
209 | return 0; | |
6f79d332 MH |
210 | } |
211 | ||
212 | /* | |
213 | * Copy one page from "oldmem" | |
214 | */ | |
215 | ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, | |
216 | unsigned long offset, int userbuf) | |
217 | { | |
df9694c7 MS |
218 | void *src; |
219 | int rc; | |
6f79d332 MH |
220 | |
221 | if (!csize) | |
222 | return 0; | |
df9694c7 MS |
223 | src = (void *) (pfn << PAGE_SHIFT) + offset; |
224 | if (userbuf) | |
225 | rc = copy_oldmem_user((void __force __user *) buf, src, csize); | |
6f79d332 | 226 | else |
df9694c7 MS |
227 | rc = copy_oldmem_kernel((void *) buf, src, csize); |
228 | return rc; | |
60a0c68d MH |
229 | } |
230 | ||
23df79da | 231 | /* |
6f79d332 | 232 | * Remap "oldmem" for kdump |
23df79da JW |
233 | * |
234 | * For the kdump reserved memory this functions performs a swap operation: | |
235 | * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] | |
236 | */ | |
6f79d332 MH |
237 | static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma, |
238 | unsigned long from, unsigned long pfn, | |
239 | unsigned long size, pgprot_t prot) | |
23df79da JW |
240 | { |
241 | unsigned long size_old; | |
242 | int rc; | |
243 | ||
244 | if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) { | |
245 | size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT)); | |
246 | rc = remap_pfn_range(vma, from, | |
247 | pfn + (OLDMEM_BASE >> PAGE_SHIFT), | |
248 | size_old, prot); | |
249 | if (rc || size == size_old) | |
250 | return rc; | |
251 | size -= size_old; | |
252 | from += size_old; | |
253 | pfn += size_old >> PAGE_SHIFT; | |
254 | } | |
255 | return remap_pfn_range(vma, from, pfn, size, prot); | |
256 | } | |
257 | ||
6f79d332 MH |
258 | /* |
259 | * Remap "oldmem" for zfcpdump | |
260 | * | |
e657d8fe MH |
261 | * We only map available memory above HSA size. Memory below HSA size |
262 | * is read on demand using the copy_oldmem_page() function. | |
6f79d332 MH |
263 | */ |
264 | static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma, | |
265 | unsigned long from, | |
266 | unsigned long pfn, | |
267 | unsigned long size, pgprot_t prot) | |
268 | { | |
37c5f6c8 | 269 | unsigned long hsa_end = sclp.hsa_size; |
6f79d332 MH |
270 | unsigned long size_hsa; |
271 | ||
e657d8fe MH |
272 | if (pfn < hsa_end >> PAGE_SHIFT) { |
273 | size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT)); | |
6f79d332 MH |
274 | if (size == size_hsa) |
275 | return 0; | |
276 | size -= size_hsa; | |
277 | from += size_hsa; | |
278 | pfn += size_hsa >> PAGE_SHIFT; | |
279 | } | |
280 | return remap_pfn_range(vma, from, pfn, size, prot); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Remap "oldmem" for kdump or zfcpdump | |
285 | */ | |
286 | int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, | |
287 | unsigned long pfn, unsigned long size, pgprot_t prot) | |
288 | { | |
289 | if (OLDMEM_BASE) | |
290 | return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot); | |
291 | else | |
292 | return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size, | |
293 | prot); | |
294 | } | |
295 | ||
60a0c68d MH |
296 | /* |
297 | * Alloc memory and panic in case of ENOMEM | |
298 | */ | |
299 | static void *kzalloc_panic(int len) | |
300 | { | |
301 | void *rc; | |
302 | ||
303 | rc = kzalloc(len, GFP_KERNEL); | |
304 | if (!rc) | |
305 | panic("s390 kdump kzalloc (%d) failed", len); | |
306 | return rc; | |
307 | } | |
308 | ||
60a0c68d MH |
309 | /* |
310 | * Initialize ELF note | |
311 | */ | |
1a2c5840 MS |
312 | static void *nt_init_name(void *buf, Elf64_Word type, void *desc, int d_len, |
313 | const char *name) | |
60a0c68d MH |
314 | { |
315 | Elf64_Nhdr *note; | |
316 | u64 len; | |
317 | ||
318 | note = (Elf64_Nhdr *)buf; | |
319 | note->n_namesz = strlen(name) + 1; | |
320 | note->n_descsz = d_len; | |
321 | note->n_type = type; | |
322 | len = sizeof(Elf64_Nhdr); | |
323 | ||
324 | memcpy(buf + len, name, note->n_namesz); | |
325 | len = roundup(len + note->n_namesz, 4); | |
326 | ||
327 | memcpy(buf + len, desc, note->n_descsz); | |
328 | len = roundup(len + note->n_descsz, 4); | |
329 | ||
330 | return PTR_ADD(buf, len); | |
331 | } | |
332 | ||
1a2c5840 | 333 | static inline void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len) |
60a0c68d | 334 | { |
a4a81d8e MH |
335 | const char *note_name = "LINUX"; |
336 | ||
337 | if (type == NT_PRPSINFO || type == NT_PRSTATUS || type == NT_PRFPREG) | |
338 | note_name = KEXEC_CORE_NOTE_NAME; | |
339 | return nt_init_name(buf, type, desc, d_len, note_name); | |
60a0c68d MH |
340 | } |
341 | ||
342 | /* | |
1a2c5840 | 343 | * Fill ELF notes for one CPU with save area registers |
60a0c68d | 344 | */ |
1a2c5840 | 345 | static void *fill_cpu_elf_notes(void *ptr, int cpu, struct save_area *sa) |
60a0c68d | 346 | { |
1a2c5840 | 347 | struct elf_prstatus nt_prstatus; |
60a0c68d MH |
348 | elf_fpregset_t nt_fpregset; |
349 | ||
1a2c5840 MS |
350 | /* Prepare prstatus note */ |
351 | memset(&nt_prstatus, 0, sizeof(nt_prstatus)); | |
352 | memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs)); | |
353 | memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw)); | |
354 | memcpy(&nt_prstatus.pr_reg.acrs, sa->acrs, sizeof(sa->acrs)); | |
355 | nt_prstatus.pr_pid = cpu; | |
356 | /* Prepare fpregset (floating point) note */ | |
60a0c68d | 357 | memset(&nt_fpregset, 0, sizeof(nt_fpregset)); |
1a2c5840 MS |
358 | memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc)); |
359 | memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs)); | |
360 | /* Create ELF notes for the CPU */ | |
361 | ptr = nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus)); | |
362 | ptr = nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset)); | |
363 | ptr = nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer)); | |
364 | ptr = nt_init(ptr, NT_S390_TODCMP, &sa->todcmp, sizeof(sa->todcmp)); | |
365 | ptr = nt_init(ptr, NT_S390_TODPREG, &sa->todpreg, sizeof(sa->todpreg)); | |
366 | ptr = nt_init(ptr, NT_S390_CTRS, &sa->ctrs, sizeof(sa->ctrs)); | |
367 | ptr = nt_init(ptr, NT_S390_PREFIX, &sa->prefix, sizeof(sa->prefix)); | |
368 | if (MACHINE_HAS_VX) { | |
369 | ptr = nt_init(ptr, NT_S390_VXRS_HIGH, | |
370 | &sa->vxrs_high, sizeof(sa->vxrs_high)); | |
371 | ptr = nt_init(ptr, NT_S390_VXRS_LOW, | |
372 | &sa->vxrs_low, sizeof(sa->vxrs_low)); | |
a62bc073 | 373 | } |
60a0c68d MH |
374 | return ptr; |
375 | } | |
376 | ||
377 | /* | |
378 | * Initialize prpsinfo note (new kernel) | |
379 | */ | |
380 | static void *nt_prpsinfo(void *ptr) | |
381 | { | |
382 | struct elf_prpsinfo prpsinfo; | |
383 | ||
384 | memset(&prpsinfo, 0, sizeof(prpsinfo)); | |
385 | prpsinfo.pr_sname = 'R'; | |
386 | strcpy(prpsinfo.pr_fname, "vmlinux"); | |
1a2c5840 | 387 | return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo)); |
60a0c68d MH |
388 | } |
389 | ||
390 | /* | |
4857d4bb | 391 | * Get vmcoreinfo using lowcore->vmcore_info (new kernel) |
60a0c68d | 392 | */ |
4857d4bb | 393 | static void *get_vmcoreinfo_old(unsigned long *size) |
60a0c68d MH |
394 | { |
395 | char nt_name[11], *vmcoreinfo; | |
396 | Elf64_Nhdr note; | |
397 | void *addr; | |
398 | ||
df9694c7 | 399 | if (copy_oldmem_kernel(&addr, &S390_lowcore.vmcore_info, sizeof(addr))) |
4857d4bb | 400 | return NULL; |
60a0c68d | 401 | memset(nt_name, 0, sizeof(nt_name)); |
df9694c7 | 402 | if (copy_oldmem_kernel(¬e, addr, sizeof(note))) |
4857d4bb | 403 | return NULL; |
df9694c7 MS |
404 | if (copy_oldmem_kernel(nt_name, addr + sizeof(note), |
405 | sizeof(nt_name) - 1)) | |
4857d4bb | 406 | return NULL; |
60a0c68d | 407 | if (strcmp(nt_name, "VMCOREINFO") != 0) |
4857d4bb MH |
408 | return NULL; |
409 | vmcoreinfo = kzalloc_panic(note.n_descsz); | |
df9694c7 | 410 | if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz)) |
4857d4bb MH |
411 | return NULL; |
412 | *size = note.n_descsz; | |
413 | return vmcoreinfo; | |
414 | } | |
415 | ||
416 | /* | |
417 | * Initialize vmcoreinfo note (new kernel) | |
418 | */ | |
419 | static void *nt_vmcoreinfo(void *ptr) | |
420 | { | |
421 | unsigned long size; | |
422 | void *vmcoreinfo; | |
423 | ||
424 | vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size); | |
425 | if (!vmcoreinfo) | |
426 | vmcoreinfo = get_vmcoreinfo_old(&size); | |
427 | if (!vmcoreinfo) | |
60a0c68d | 428 | return ptr; |
1a2c5840 | 429 | return nt_init_name(ptr, 0, vmcoreinfo, size, "VMCOREINFO"); |
60a0c68d MH |
430 | } |
431 | ||
dcc00b79 MH |
432 | /* |
433 | * Initialize final note (needed for /proc/vmcore code) | |
434 | */ | |
435 | static void *nt_final(void *ptr) | |
436 | { | |
437 | Elf64_Nhdr *note; | |
438 | ||
439 | note = (Elf64_Nhdr *) ptr; | |
440 | note->n_namesz = 0; | |
441 | note->n_descsz = 0; | |
442 | note->n_type = 0; | |
443 | return PTR_ADD(ptr, sizeof(Elf64_Nhdr)); | |
444 | } | |
445 | ||
60a0c68d MH |
446 | /* |
447 | * Initialize ELF header (new kernel) | |
448 | */ | |
449 | static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt) | |
450 | { | |
451 | memset(ehdr, 0, sizeof(*ehdr)); | |
452 | memcpy(ehdr->e_ident, ELFMAG, SELFMAG); | |
453 | ehdr->e_ident[EI_CLASS] = ELFCLASS64; | |
454 | ehdr->e_ident[EI_DATA] = ELFDATA2MSB; | |
455 | ehdr->e_ident[EI_VERSION] = EV_CURRENT; | |
456 | memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD); | |
457 | ehdr->e_type = ET_CORE; | |
458 | ehdr->e_machine = EM_S390; | |
459 | ehdr->e_version = EV_CURRENT; | |
460 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
461 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
462 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
463 | ehdr->e_phnum = mem_chunk_cnt + 1; | |
464 | return ehdr + 1; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Return CPU count for ELF header (new kernel) | |
469 | */ | |
470 | static int get_cpu_cnt(void) | |
471 | { | |
1a2c5840 MS |
472 | struct save_area *sa; |
473 | int cpus = 0; | |
60a0c68d | 474 | |
1a2c5840 MS |
475 | list_for_each_entry(sa, &dump_save_areas, list) |
476 | if (sa->prefix != 0) | |
477 | cpus++; | |
60a0c68d MH |
478 | return cpus; |
479 | } | |
480 | ||
481 | /* | |
482 | * Return memory chunk count for ELF header (new kernel) | |
483 | */ | |
484 | static int get_mem_chunk_cnt(void) | |
485 | { | |
50be6345 PH |
486 | int cnt = 0; |
487 | u64 idx; | |
488 | ||
3c4aac86 AK |
489 | for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE, |
490 | MEMBLOCK_NONE, NULL, NULL, NULL) | |
60a0c68d | 491 | cnt++; |
60a0c68d MH |
492 | return cnt; |
493 | } | |
494 | ||
60a0c68d MH |
495 | /* |
496 | * Initialize ELF loads (new kernel) | |
497 | */ | |
50be6345 | 498 | static void loads_init(Elf64_Phdr *phdr, u64 loads_offset) |
60a0c68d | 499 | { |
50be6345 PH |
500 | phys_addr_t start, end; |
501 | u64 idx; | |
60a0c68d | 502 | |
3c4aac86 AK |
503 | for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE, |
504 | MEMBLOCK_NONE, &start, &end, NULL) { | |
50be6345 | 505 | phdr->p_filesz = end - start; |
60a0c68d | 506 | phdr->p_type = PT_LOAD; |
50be6345 PH |
507 | phdr->p_offset = start; |
508 | phdr->p_vaddr = start; | |
509 | phdr->p_paddr = start; | |
510 | phdr->p_memsz = end - start; | |
60a0c68d MH |
511 | phdr->p_flags = PF_R | PF_W | PF_X; |
512 | phdr->p_align = PAGE_SIZE; | |
513 | phdr++; | |
514 | } | |
60a0c68d MH |
515 | } |
516 | ||
517 | /* | |
518 | * Initialize notes (new kernel) | |
519 | */ | |
520 | static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset) | |
521 | { | |
1a2c5840 | 522 | struct save_area *sa; |
60a0c68d | 523 | void *ptr_start = ptr; |
1a2c5840 | 524 | int cpu; |
60a0c68d MH |
525 | |
526 | ptr = nt_prpsinfo(ptr); | |
527 | ||
1a2c5840 MS |
528 | cpu = 1; |
529 | list_for_each_entry(sa, &dump_save_areas, list) | |
530 | if (sa->prefix != 0) | |
531 | ptr = fill_cpu_elf_notes(ptr, cpu++, sa); | |
60a0c68d | 532 | ptr = nt_vmcoreinfo(ptr); |
dcc00b79 | 533 | ptr = nt_final(ptr); |
60a0c68d MH |
534 | memset(phdr, 0, sizeof(*phdr)); |
535 | phdr->p_type = PT_NOTE; | |
97b0f6f9 | 536 | phdr->p_offset = notes_offset; |
60a0c68d MH |
537 | phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start); |
538 | phdr->p_memsz = phdr->p_filesz; | |
539 | return ptr; | |
540 | } | |
541 | ||
542 | /* | |
543 | * Create ELF core header (new kernel) | |
544 | */ | |
97b0f6f9 | 545 | int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) |
60a0c68d MH |
546 | { |
547 | Elf64_Phdr *phdr_notes, *phdr_loads; | |
548 | int mem_chunk_cnt; | |
549 | void *ptr, *hdr; | |
550 | u32 alloc_size; | |
551 | u64 hdr_off; | |
552 | ||
6f79d332 MH |
553 | /* If we are not in kdump or zfcpdump mode return */ |
554 | if (!OLDMEM_BASE && ipl_info.type != IPL_TYPE_FCP_DUMP) | |
97b0f6f9 | 555 | return 0; |
e657d8fe | 556 | /* If we cannot get HSA size for zfcpdump return error */ |
37c5f6c8 | 557 | if (ipl_info.type == IPL_TYPE_FCP_DUMP && !sclp.hsa_size) |
e657d8fe | 558 | return -ENODEV; |
50be6345 PH |
559 | |
560 | /* For kdump, exclude previous crashkernel memory */ | |
561 | if (OLDMEM_BASE) { | |
562 | oldmem_region.base = OLDMEM_BASE; | |
563 | oldmem_region.size = OLDMEM_SIZE; | |
564 | oldmem_type.total_size = OLDMEM_SIZE; | |
565 | } | |
566 | ||
60a0c68d MH |
567 | mem_chunk_cnt = get_mem_chunk_cnt(); |
568 | ||
a62bc073 | 569 | alloc_size = 0x1000 + get_cpu_cnt() * 0x4a0 + |
60a0c68d MH |
570 | mem_chunk_cnt * sizeof(Elf64_Phdr); |
571 | hdr = kzalloc_panic(alloc_size); | |
572 | /* Init elf header */ | |
573 | ptr = ehdr_init(hdr, mem_chunk_cnt); | |
574 | /* Init program headers */ | |
575 | phdr_notes = ptr; | |
576 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr)); | |
577 | phdr_loads = ptr; | |
578 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt); | |
579 | /* Init notes */ | |
580 | hdr_off = PTR_DIFF(ptr, hdr); | |
581 | ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off); | |
582 | /* Init loads */ | |
583 | hdr_off = PTR_DIFF(ptr, hdr); | |
97b0f6f9 MH |
584 | loads_init(phdr_loads, hdr_off); |
585 | *addr = (unsigned long long) hdr; | |
97b0f6f9 MH |
586 | *size = (unsigned long long) hdr_off; |
587 | BUG_ON(elfcorehdr_size > alloc_size); | |
588 | return 0; | |
60a0c68d MH |
589 | } |
590 | ||
591 | /* | |
97b0f6f9 | 592 | * Free ELF core header (new kernel) |
60a0c68d | 593 | */ |
97b0f6f9 | 594 | void elfcorehdr_free(unsigned long long addr) |
60a0c68d | 595 | { |
97b0f6f9 MH |
596 | kfree((void *)(unsigned long)addr); |
597 | } | |
598 | ||
599 | /* | |
600 | * Read from ELF header | |
601 | */ | |
602 | ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos) | |
603 | { | |
604 | void *src = (void *)(unsigned long)*ppos; | |
605 | ||
97b0f6f9 MH |
606 | memcpy(buf, src, count); |
607 | *ppos += count; | |
608 | return count; | |
60a0c68d MH |
609 | } |
610 | ||
97b0f6f9 MH |
611 | /* |
612 | * Read from ELF notes data | |
613 | */ | |
614 | ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos) | |
615 | { | |
616 | void *src = (void *)(unsigned long)*ppos; | |
97b0f6f9 | 617 | |
8a07dd02 | 618 | memcpy(buf, src, count); |
97b0f6f9 MH |
619 | *ppos += count; |
620 | return count; | |
621 | } |