Commit | Line | Data |
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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> | |
57c8a661 | 16 | #include <linux/memblock.h> |
60a0c68d | 17 | #include <linux/elf.h> |
1a2c5840 | 18 | #include <asm/asm-offsets.h> |
4857d4bb | 19 | #include <asm/os_info.h> |
6b563d8c HC |
20 | #include <asm/elf.h> |
21 | #include <asm/ipl.h> | |
6f79d332 | 22 | #include <asm/sclp.h> |
60a0c68d MH |
23 | |
24 | #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) | |
25 | #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) | |
26 | #define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y)))) | |
27 | ||
50be6345 PH |
28 | static struct memblock_region oldmem_region; |
29 | ||
30 | static struct memblock_type oldmem_type = { | |
31 | .cnt = 1, | |
32 | .max = 1, | |
33 | .total_size = 0, | |
34 | .regions = &oldmem_region, | |
0262d9c8 | 35 | .name = "oldmem", |
50be6345 PH |
36 | }; |
37 | ||
1a2c5840 MS |
38 | struct save_area { |
39 | struct list_head list; | |
40 | u64 psw[2]; | |
41 | u64 ctrs[16]; | |
42 | u64 gprs[16]; | |
43 | u32 acrs[16]; | |
44 | u64 fprs[16]; | |
45 | u32 fpc; | |
46 | u32 prefix; | |
47 | u64 todpreg; | |
48 | u64 timer; | |
49 | u64 todcmp; | |
50 | u64 vxrs_low[16]; | |
51 | __vector128 vxrs_high[16]; | |
52 | }; | |
53 | ||
54 | static LIST_HEAD(dump_save_areas); | |
55 | ||
56 | /* | |
57 | * Allocate a save area | |
58 | */ | |
59 | struct save_area * __init save_area_alloc(bool is_boot_cpu) | |
60 | { | |
61 | struct save_area *sa; | |
62 | ||
9a8dd708 | 63 | sa = (void *) memblock_phys_alloc(sizeof(*sa), 8); |
ecc3e771 MR |
64 | if (!sa) |
65 | panic("Failed to allocate save area\n"); | |
66 | ||
1a2c5840 MS |
67 | if (is_boot_cpu) |
68 | list_add(&sa->list, &dump_save_areas); | |
69 | else | |
70 | list_add_tail(&sa->list, &dump_save_areas); | |
71 | return sa; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Return the address of the save area for the boot CPU | |
76 | */ | |
77 | struct save_area * __init save_area_boot_cpu(void) | |
78 | { | |
f296190e | 79 | return list_first_entry_or_null(&dump_save_areas, struct save_area, list); |
1a2c5840 MS |
80 | } |
81 | ||
82 | /* | |
83 | * Copy CPU registers into the save area | |
84 | */ | |
85 | void __init save_area_add_regs(struct save_area *sa, void *regs) | |
86 | { | |
c667aeac | 87 | struct lowcore *lc; |
1a2c5840 | 88 | |
c667aeac | 89 | lc = (struct lowcore *)(regs - __LC_FPREGS_SAVE_AREA); |
1a2c5840 MS |
90 | memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw)); |
91 | memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs)); | |
92 | memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs)); | |
93 | memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs)); | |
94 | memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs)); | |
95 | memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc)); | |
96 | memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix)); | |
97 | memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg)); | |
98 | memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer)); | |
99 | memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp)); | |
100 | } | |
101 | ||
102 | /* | |
103 | * Copy vector registers into the save area | |
104 | */ | |
105 | void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs) | |
106 | { | |
107 | int i; | |
108 | ||
109 | /* Copy lower halves of vector registers 0-15 */ | |
110 | for (i = 0; i < 16; i++) | |
111 | memcpy(&sa->vxrs_low[i], &vxrs[i].u[2], 8); | |
112 | /* Copy vector registers 16-31 */ | |
113 | memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128)); | |
114 | } | |
58952942 | 115 | |
191a2fa0 MH |
116 | /* |
117 | * Return physical address for virtual address | |
118 | */ | |
119 | static inline void *load_real_addr(void *addr) | |
120 | { | |
121 | unsigned long real_addr; | |
122 | ||
123 | asm volatile( | |
124 | " lra %0,0(%1)\n" | |
125 | " jz 0f\n" | |
126 | " la %0,0\n" | |
127 | "0:" | |
128 | : "=a" (real_addr) : "a" (addr) : "cc"); | |
129 | return (void *)real_addr; | |
130 | } | |
131 | ||
132 | /* | |
df9694c7 | 133 | * Copy memory of the old, dumped system to a kernel space virtual address |
191a2fa0 | 134 | */ |
df9694c7 | 135 | int copy_oldmem_kernel(void *dst, void *src, size_t count) |
6f79d332 | 136 | { |
df9694c7 MS |
137 | unsigned long from, len; |
138 | void *ra; | |
6f79d332 MH |
139 | int rc; |
140 | ||
df9694c7 MS |
141 | while (count) { |
142 | from = __pa(src); | |
143 | if (!OLDMEM_BASE && from < sclp.hsa_size) { | |
bd37b368 | 144 | /* Copy from zfcp/nvme dump HSA area */ |
df9694c7 MS |
145 | len = min(count, sclp.hsa_size - from); |
146 | rc = memcpy_hsa_kernel(dst, from, len); | |
147 | if (rc) | |
148 | return rc; | |
149 | } else { | |
150 | /* Check for swapped kdump oldmem areas */ | |
151 | if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) { | |
152 | from -= OLDMEM_BASE; | |
153 | len = min(count, OLDMEM_SIZE - from); | |
154 | } else if (OLDMEM_BASE && from < OLDMEM_SIZE) { | |
155 | len = min(count, OLDMEM_SIZE - from); | |
156 | from += OLDMEM_BASE; | |
157 | } else { | |
158 | len = count; | |
159 | } | |
160 | if (is_vmalloc_or_module_addr(dst)) { | |
161 | ra = load_real_addr(dst); | |
162 | len = min(PAGE_SIZE - offset_in_page(ra), len); | |
163 | } else { | |
164 | ra = dst; | |
165 | } | |
166 | if (memcpy_real(ra, (void *) from, len)) | |
167 | return -EFAULT; | |
168 | } | |
169 | dst += len; | |
170 | src += len; | |
171 | count -= len; | |
6f79d332 | 172 | } |
df9694c7 | 173 | return 0; |
6f79d332 MH |
174 | } |
175 | ||
176 | /* | |
df9694c7 | 177 | * Copy memory of the old, dumped system to a user space virtual address |
60a0c68d | 178 | */ |
f70a34c5 | 179 | static int copy_oldmem_user(void __user *dst, void *src, size_t count) |
60a0c68d | 180 | { |
df9694c7 | 181 | unsigned long from, len; |
191a2fa0 | 182 | int rc; |
60a0c68d | 183 | |
df9694c7 MS |
184 | while (count) { |
185 | from = __pa(src); | |
186 | if (!OLDMEM_BASE && from < sclp.hsa_size) { | |
bd37b368 | 187 | /* Copy from zfcp/nvme dump HSA area */ |
df9694c7 MS |
188 | len = min(count, sclp.hsa_size - from); |
189 | rc = memcpy_hsa_user(dst, from, len); | |
190 | if (rc) | |
191 | return rc; | |
192 | } else { | |
193 | /* Check for swapped kdump oldmem areas */ | |
194 | if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) { | |
195 | from -= OLDMEM_BASE; | |
196 | len = min(count, OLDMEM_SIZE - from); | |
197 | } else if (OLDMEM_BASE && from < OLDMEM_SIZE) { | |
198 | len = min(count, OLDMEM_SIZE - from); | |
199 | from += OLDMEM_BASE; | |
200 | } else { | |
201 | len = count; | |
202 | } | |
203 | rc = copy_to_user_real(dst, (void *) from, count); | |
204 | if (rc) | |
205 | return rc; | |
206 | } | |
207 | dst += len; | |
208 | src += len; | |
209 | count -= len; | |
210 | } | |
211 | return 0; | |
6f79d332 MH |
212 | } |
213 | ||
214 | /* | |
215 | * Copy one page from "oldmem" | |
216 | */ | |
217 | ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, | |
218 | unsigned long offset, int userbuf) | |
219 | { | |
df9694c7 MS |
220 | void *src; |
221 | int rc; | |
6f79d332 MH |
222 | |
223 | if (!csize) | |
224 | return 0; | |
df9694c7 MS |
225 | src = (void *) (pfn << PAGE_SHIFT) + offset; |
226 | if (userbuf) | |
227 | rc = copy_oldmem_user((void __force __user *) buf, src, csize); | |
6f79d332 | 228 | else |
df9694c7 MS |
229 | rc = copy_oldmem_kernel((void *) buf, src, csize); |
230 | return rc; | |
60a0c68d MH |
231 | } |
232 | ||
23df79da | 233 | /* |
6f79d332 | 234 | * Remap "oldmem" for kdump |
23df79da JW |
235 | * |
236 | * For the kdump reserved memory this functions performs a swap operation: | |
237 | * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] | |
238 | */ | |
6f79d332 MH |
239 | static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma, |
240 | unsigned long from, unsigned long pfn, | |
241 | unsigned long size, pgprot_t prot) | |
23df79da JW |
242 | { |
243 | unsigned long size_old; | |
244 | int rc; | |
245 | ||
246 | if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) { | |
247 | size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT)); | |
248 | rc = remap_pfn_range(vma, from, | |
249 | pfn + (OLDMEM_BASE >> PAGE_SHIFT), | |
250 | size_old, prot); | |
251 | if (rc || size == size_old) | |
252 | return rc; | |
253 | size -= size_old; | |
254 | from += size_old; | |
255 | pfn += size_old >> PAGE_SHIFT; | |
256 | } | |
257 | return remap_pfn_range(vma, from, pfn, size, prot); | |
258 | } | |
259 | ||
6f79d332 | 260 | /* |
bd37b368 | 261 | * Remap "oldmem" for zfcp/nvme dump |
6f79d332 | 262 | * |
e657d8fe MH |
263 | * We only map available memory above HSA size. Memory below HSA size |
264 | * is read on demand using the copy_oldmem_page() function. | |
6f79d332 MH |
265 | */ |
266 | static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma, | |
267 | unsigned long from, | |
268 | unsigned long pfn, | |
269 | unsigned long size, pgprot_t prot) | |
270 | { | |
37c5f6c8 | 271 | unsigned long hsa_end = sclp.hsa_size; |
6f79d332 MH |
272 | unsigned long size_hsa; |
273 | ||
e657d8fe MH |
274 | if (pfn < hsa_end >> PAGE_SHIFT) { |
275 | size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT)); | |
6f79d332 MH |
276 | if (size == size_hsa) |
277 | return 0; | |
278 | size -= size_hsa; | |
279 | from += size_hsa; | |
280 | pfn += size_hsa >> PAGE_SHIFT; | |
281 | } | |
282 | return remap_pfn_range(vma, from, pfn, size, prot); | |
283 | } | |
284 | ||
285 | /* | |
bd37b368 | 286 | * Remap "oldmem" for kdump or zfcp/nvme dump |
6f79d332 MH |
287 | */ |
288 | int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, | |
289 | unsigned long pfn, unsigned long size, pgprot_t prot) | |
290 | { | |
291 | if (OLDMEM_BASE) | |
292 | return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot); | |
293 | else | |
294 | return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size, | |
295 | prot); | |
296 | } | |
297 | ||
8cce437f PR |
298 | static const char *nt_name(Elf64_Word type) |
299 | { | |
300 | const char *name = "LINUX"; | |
301 | ||
302 | if (type == NT_PRPSINFO || type == NT_PRSTATUS || type == NT_PRFPREG) | |
303 | name = KEXEC_CORE_NOTE_NAME; | |
304 | return name; | |
305 | } | |
306 | ||
60a0c68d MH |
307 | /* |
308 | * Initialize ELF note | |
309 | */ | |
1a2c5840 MS |
310 | static void *nt_init_name(void *buf, Elf64_Word type, void *desc, int d_len, |
311 | const char *name) | |
60a0c68d MH |
312 | { |
313 | Elf64_Nhdr *note; | |
314 | u64 len; | |
315 | ||
316 | note = (Elf64_Nhdr *)buf; | |
317 | note->n_namesz = strlen(name) + 1; | |
318 | note->n_descsz = d_len; | |
319 | note->n_type = type; | |
320 | len = sizeof(Elf64_Nhdr); | |
321 | ||
322 | memcpy(buf + len, name, note->n_namesz); | |
323 | len = roundup(len + note->n_namesz, 4); | |
324 | ||
325 | memcpy(buf + len, desc, note->n_descsz); | |
326 | len = roundup(len + note->n_descsz, 4); | |
327 | ||
328 | return PTR_ADD(buf, len); | |
329 | } | |
330 | ||
1a2c5840 | 331 | static inline void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len) |
60a0c68d | 332 | { |
8cce437f PR |
333 | return nt_init_name(buf, type, desc, d_len, nt_name(type)); |
334 | } | |
335 | ||
336 | /* | |
337 | * Calculate the size of ELF note | |
338 | */ | |
339 | static size_t nt_size_name(int d_len, const char *name) | |
340 | { | |
341 | size_t size; | |
a4a81d8e | 342 | |
8cce437f PR |
343 | size = sizeof(Elf64_Nhdr); |
344 | size += roundup(strlen(name) + 1, 4); | |
345 | size += roundup(d_len, 4); | |
346 | ||
347 | return size; | |
348 | } | |
349 | ||
350 | static inline size_t nt_size(Elf64_Word type, int d_len) | |
351 | { | |
352 | return nt_size_name(d_len, nt_name(type)); | |
60a0c68d MH |
353 | } |
354 | ||
355 | /* | |
1a2c5840 | 356 | * Fill ELF notes for one CPU with save area registers |
60a0c68d | 357 | */ |
1a2c5840 | 358 | static void *fill_cpu_elf_notes(void *ptr, int cpu, struct save_area *sa) |
60a0c68d | 359 | { |
1a2c5840 | 360 | struct elf_prstatus nt_prstatus; |
60a0c68d MH |
361 | elf_fpregset_t nt_fpregset; |
362 | ||
1a2c5840 MS |
363 | /* Prepare prstatus note */ |
364 | memset(&nt_prstatus, 0, sizeof(nt_prstatus)); | |
365 | memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs)); | |
366 | memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw)); | |
367 | memcpy(&nt_prstatus.pr_reg.acrs, sa->acrs, sizeof(sa->acrs)); | |
f2485a2d | 368 | nt_prstatus.common.pr_pid = cpu; |
1a2c5840 | 369 | /* Prepare fpregset (floating point) note */ |
60a0c68d | 370 | memset(&nt_fpregset, 0, sizeof(nt_fpregset)); |
1a2c5840 MS |
371 | memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc)); |
372 | memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs)); | |
373 | /* Create ELF notes for the CPU */ | |
374 | ptr = nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus)); | |
375 | ptr = nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset)); | |
376 | ptr = nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer)); | |
377 | ptr = nt_init(ptr, NT_S390_TODCMP, &sa->todcmp, sizeof(sa->todcmp)); | |
378 | ptr = nt_init(ptr, NT_S390_TODPREG, &sa->todpreg, sizeof(sa->todpreg)); | |
379 | ptr = nt_init(ptr, NT_S390_CTRS, &sa->ctrs, sizeof(sa->ctrs)); | |
380 | ptr = nt_init(ptr, NT_S390_PREFIX, &sa->prefix, sizeof(sa->prefix)); | |
381 | if (MACHINE_HAS_VX) { | |
382 | ptr = nt_init(ptr, NT_S390_VXRS_HIGH, | |
383 | &sa->vxrs_high, sizeof(sa->vxrs_high)); | |
384 | ptr = nt_init(ptr, NT_S390_VXRS_LOW, | |
385 | &sa->vxrs_low, sizeof(sa->vxrs_low)); | |
a62bc073 | 386 | } |
60a0c68d MH |
387 | return ptr; |
388 | } | |
389 | ||
8cce437f PR |
390 | /* |
391 | * Calculate size of ELF notes per cpu | |
392 | */ | |
393 | static size_t get_cpu_elf_notes_size(void) | |
394 | { | |
395 | struct save_area *sa = NULL; | |
396 | size_t size; | |
397 | ||
398 | size = nt_size(NT_PRSTATUS, sizeof(struct elf_prstatus)); | |
399 | size += nt_size(NT_PRFPREG, sizeof(elf_fpregset_t)); | |
400 | size += nt_size(NT_S390_TIMER, sizeof(sa->timer)); | |
401 | size += nt_size(NT_S390_TODCMP, sizeof(sa->todcmp)); | |
402 | size += nt_size(NT_S390_TODPREG, sizeof(sa->todpreg)); | |
403 | size += nt_size(NT_S390_CTRS, sizeof(sa->ctrs)); | |
404 | size += nt_size(NT_S390_PREFIX, sizeof(sa->prefix)); | |
405 | if (MACHINE_HAS_VX) { | |
406 | size += nt_size(NT_S390_VXRS_HIGH, sizeof(sa->vxrs_high)); | |
407 | size += nt_size(NT_S390_VXRS_LOW, sizeof(sa->vxrs_low)); | |
408 | } | |
409 | ||
410 | return size; | |
411 | } | |
412 | ||
60a0c68d MH |
413 | /* |
414 | * Initialize prpsinfo note (new kernel) | |
415 | */ | |
416 | static void *nt_prpsinfo(void *ptr) | |
417 | { | |
418 | struct elf_prpsinfo prpsinfo; | |
419 | ||
420 | memset(&prpsinfo, 0, sizeof(prpsinfo)); | |
421 | prpsinfo.pr_sname = 'R'; | |
422 | strcpy(prpsinfo.pr_fname, "vmlinux"); | |
1a2c5840 | 423 | return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo)); |
60a0c68d MH |
424 | } |
425 | ||
426 | /* | |
4857d4bb | 427 | * Get vmcoreinfo using lowcore->vmcore_info (new kernel) |
60a0c68d | 428 | */ |
4857d4bb | 429 | static void *get_vmcoreinfo_old(unsigned long *size) |
60a0c68d MH |
430 | { |
431 | char nt_name[11], *vmcoreinfo; | |
432 | Elf64_Nhdr note; | |
433 | void *addr; | |
434 | ||
df9694c7 | 435 | if (copy_oldmem_kernel(&addr, &S390_lowcore.vmcore_info, sizeof(addr))) |
4857d4bb | 436 | return NULL; |
60a0c68d | 437 | memset(nt_name, 0, sizeof(nt_name)); |
df9694c7 | 438 | if (copy_oldmem_kernel(¬e, addr, sizeof(note))) |
4857d4bb | 439 | return NULL; |
df9694c7 MS |
440 | if (copy_oldmem_kernel(nt_name, addr + sizeof(note), |
441 | sizeof(nt_name) - 1)) | |
4857d4bb | 442 | return NULL; |
2d2e7075 | 443 | if (strcmp(nt_name, VMCOREINFO_NOTE_NAME) != 0) |
4857d4bb | 444 | return NULL; |
28b74653 PR |
445 | vmcoreinfo = kzalloc(note.n_descsz, GFP_KERNEL); |
446 | if (!vmcoreinfo) | |
447 | return NULL; | |
2d2e7075 PR |
448 | if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz)) { |
449 | kfree(vmcoreinfo); | |
4857d4bb | 450 | return NULL; |
2d2e7075 | 451 | } |
4857d4bb MH |
452 | *size = note.n_descsz; |
453 | return vmcoreinfo; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Initialize vmcoreinfo note (new kernel) | |
458 | */ | |
459 | static void *nt_vmcoreinfo(void *ptr) | |
460 | { | |
2d2e7075 | 461 | const char *name = VMCOREINFO_NOTE_NAME; |
4857d4bb MH |
462 | unsigned long size; |
463 | void *vmcoreinfo; | |
464 | ||
465 | vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size); | |
2d2e7075 PR |
466 | if (vmcoreinfo) |
467 | return nt_init_name(ptr, 0, vmcoreinfo, size, name); | |
468 | ||
469 | vmcoreinfo = get_vmcoreinfo_old(&size); | |
4857d4bb | 470 | if (!vmcoreinfo) |
60a0c68d | 471 | return ptr; |
2d2e7075 PR |
472 | ptr = nt_init_name(ptr, 0, vmcoreinfo, size, name); |
473 | kfree(vmcoreinfo); | |
474 | return ptr; | |
60a0c68d MH |
475 | } |
476 | ||
8cce437f PR |
477 | static size_t nt_vmcoreinfo_size(void) |
478 | { | |
263b0e48 PR |
479 | const char *name = VMCOREINFO_NOTE_NAME; |
480 | unsigned long size; | |
481 | void *vmcoreinfo; | |
8cce437f | 482 | |
263b0e48 PR |
483 | vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size); |
484 | if (vmcoreinfo) | |
485 | return nt_size_name(size, name); | |
8cce437f | 486 | |
263b0e48 PR |
487 | vmcoreinfo = get_vmcoreinfo_old(&size); |
488 | if (!vmcoreinfo) | |
8cce437f PR |
489 | return 0; |
490 | ||
263b0e48 PR |
491 | kfree(vmcoreinfo); |
492 | return nt_size_name(size, name); | |
8cce437f PR |
493 | } |
494 | ||
dcc00b79 MH |
495 | /* |
496 | * Initialize final note (needed for /proc/vmcore code) | |
497 | */ | |
498 | static void *nt_final(void *ptr) | |
499 | { | |
500 | Elf64_Nhdr *note; | |
501 | ||
502 | note = (Elf64_Nhdr *) ptr; | |
503 | note->n_namesz = 0; | |
504 | note->n_descsz = 0; | |
505 | note->n_type = 0; | |
506 | return PTR_ADD(ptr, sizeof(Elf64_Nhdr)); | |
507 | } | |
508 | ||
60a0c68d MH |
509 | /* |
510 | * Initialize ELF header (new kernel) | |
511 | */ | |
512 | static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt) | |
513 | { | |
514 | memset(ehdr, 0, sizeof(*ehdr)); | |
515 | memcpy(ehdr->e_ident, ELFMAG, SELFMAG); | |
516 | ehdr->e_ident[EI_CLASS] = ELFCLASS64; | |
517 | ehdr->e_ident[EI_DATA] = ELFDATA2MSB; | |
518 | ehdr->e_ident[EI_VERSION] = EV_CURRENT; | |
519 | memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD); | |
520 | ehdr->e_type = ET_CORE; | |
521 | ehdr->e_machine = EM_S390; | |
522 | ehdr->e_version = EV_CURRENT; | |
523 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
524 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
525 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
526 | ehdr->e_phnum = mem_chunk_cnt + 1; | |
527 | return ehdr + 1; | |
528 | } | |
529 | ||
530 | /* | |
531 | * Return CPU count for ELF header (new kernel) | |
532 | */ | |
533 | static int get_cpu_cnt(void) | |
534 | { | |
1a2c5840 MS |
535 | struct save_area *sa; |
536 | int cpus = 0; | |
60a0c68d | 537 | |
1a2c5840 MS |
538 | list_for_each_entry(sa, &dump_save_areas, list) |
539 | if (sa->prefix != 0) | |
540 | cpus++; | |
60a0c68d MH |
541 | return cpus; |
542 | } | |
543 | ||
544 | /* | |
545 | * Return memory chunk count for ELF header (new kernel) | |
546 | */ | |
547 | static int get_mem_chunk_cnt(void) | |
548 | { | |
50be6345 PH |
549 | int cnt = 0; |
550 | u64 idx; | |
551 | ||
77649905 | 552 | for_each_physmem_range(idx, &oldmem_type, NULL, NULL) |
60a0c68d | 553 | cnt++; |
60a0c68d MH |
554 | return cnt; |
555 | } | |
556 | ||
60a0c68d MH |
557 | /* |
558 | * Initialize ELF loads (new kernel) | |
559 | */ | |
50be6345 | 560 | static void loads_init(Elf64_Phdr *phdr, u64 loads_offset) |
60a0c68d | 561 | { |
50be6345 PH |
562 | phys_addr_t start, end; |
563 | u64 idx; | |
60a0c68d | 564 | |
77649905 | 565 | for_each_physmem_range(idx, &oldmem_type, &start, &end) { |
50be6345 | 566 | phdr->p_filesz = end - start; |
60a0c68d | 567 | phdr->p_type = PT_LOAD; |
50be6345 PH |
568 | phdr->p_offset = start; |
569 | phdr->p_vaddr = start; | |
570 | phdr->p_paddr = start; | |
571 | phdr->p_memsz = end - start; | |
60a0c68d MH |
572 | phdr->p_flags = PF_R | PF_W | PF_X; |
573 | phdr->p_align = PAGE_SIZE; | |
574 | phdr++; | |
575 | } | |
60a0c68d MH |
576 | } |
577 | ||
578 | /* | |
579 | * Initialize notes (new kernel) | |
580 | */ | |
581 | static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset) | |
582 | { | |
1a2c5840 | 583 | struct save_area *sa; |
60a0c68d | 584 | void *ptr_start = ptr; |
1a2c5840 | 585 | int cpu; |
60a0c68d MH |
586 | |
587 | ptr = nt_prpsinfo(ptr); | |
588 | ||
1a2c5840 MS |
589 | cpu = 1; |
590 | list_for_each_entry(sa, &dump_save_areas, list) | |
591 | if (sa->prefix != 0) | |
592 | ptr = fill_cpu_elf_notes(ptr, cpu++, sa); | |
60a0c68d | 593 | ptr = nt_vmcoreinfo(ptr); |
dcc00b79 | 594 | ptr = nt_final(ptr); |
60a0c68d MH |
595 | memset(phdr, 0, sizeof(*phdr)); |
596 | phdr->p_type = PT_NOTE; | |
97b0f6f9 | 597 | phdr->p_offset = notes_offset; |
60a0c68d MH |
598 | phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start); |
599 | phdr->p_memsz = phdr->p_filesz; | |
600 | return ptr; | |
601 | } | |
602 | ||
8cce437f PR |
603 | static size_t get_elfcorehdr_size(int mem_chunk_cnt) |
604 | { | |
605 | size_t size; | |
606 | ||
607 | size = sizeof(Elf64_Ehdr); | |
608 | /* PT_NOTES */ | |
609 | size += sizeof(Elf64_Phdr); | |
610 | /* nt_prpsinfo */ | |
611 | size += nt_size(NT_PRPSINFO, sizeof(struct elf_prpsinfo)); | |
612 | /* regsets */ | |
613 | size += get_cpu_cnt() * get_cpu_elf_notes_size(); | |
614 | /* nt_vmcoreinfo */ | |
615 | size += nt_vmcoreinfo_size(); | |
616 | /* nt_final */ | |
617 | size += sizeof(Elf64_Nhdr); | |
618 | /* PT_LOADS */ | |
619 | size += mem_chunk_cnt * sizeof(Elf64_Phdr); | |
620 | ||
621 | return size; | |
622 | } | |
623 | ||
60a0c68d MH |
624 | /* |
625 | * Create ELF core header (new kernel) | |
626 | */ | |
97b0f6f9 | 627 | int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) |
60a0c68d MH |
628 | { |
629 | Elf64_Phdr *phdr_notes, *phdr_loads; | |
630 | int mem_chunk_cnt; | |
631 | void *ptr, *hdr; | |
632 | u32 alloc_size; | |
633 | u64 hdr_off; | |
634 | ||
bd37b368 AE |
635 | /* If we are not in kdump or zfcp/nvme dump mode return */ |
636 | if (!OLDMEM_BASE && !is_ipl_type_dump()) | |
97b0f6f9 | 637 | return 0; |
bd37b368 AE |
638 | /* If we cannot get HSA size for zfcp/nvme dump return error */ |
639 | if (is_ipl_type_dump() && !sclp.hsa_size) | |
e657d8fe | 640 | return -ENODEV; |
50be6345 PH |
641 | |
642 | /* For kdump, exclude previous crashkernel memory */ | |
643 | if (OLDMEM_BASE) { | |
644 | oldmem_region.base = OLDMEM_BASE; | |
645 | oldmem_region.size = OLDMEM_SIZE; | |
646 | oldmem_type.total_size = OLDMEM_SIZE; | |
647 | } | |
648 | ||
60a0c68d MH |
649 | mem_chunk_cnt = get_mem_chunk_cnt(); |
650 | ||
8cce437f PR |
651 | alloc_size = get_elfcorehdr_size(mem_chunk_cnt); |
652 | ||
28b74653 PR |
653 | hdr = kzalloc(alloc_size, GFP_KERNEL); |
654 | ||
655 | /* Without elfcorehdr /proc/vmcore cannot be created. Thus creating | |
656 | * a dump with this crash kernel will fail. Panic now to allow other | |
657 | * dump mechanisms to take over. | |
658 | */ | |
659 | if (!hdr) | |
660 | panic("s390 kdump allocating elfcorehdr failed"); | |
661 | ||
60a0c68d MH |
662 | /* Init elf header */ |
663 | ptr = ehdr_init(hdr, mem_chunk_cnt); | |
664 | /* Init program headers */ | |
665 | phdr_notes = ptr; | |
666 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr)); | |
667 | phdr_loads = ptr; | |
668 | ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt); | |
669 | /* Init notes */ | |
670 | hdr_off = PTR_DIFF(ptr, hdr); | |
671 | ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off); | |
672 | /* Init loads */ | |
673 | hdr_off = PTR_DIFF(ptr, hdr); | |
97b0f6f9 MH |
674 | loads_init(phdr_loads, hdr_off); |
675 | *addr = (unsigned long long) hdr; | |
97b0f6f9 MH |
676 | *size = (unsigned long long) hdr_off; |
677 | BUG_ON(elfcorehdr_size > alloc_size); | |
678 | return 0; | |
60a0c68d MH |
679 | } |
680 | ||
681 | /* | |
97b0f6f9 | 682 | * Free ELF core header (new kernel) |
60a0c68d | 683 | */ |
97b0f6f9 | 684 | void elfcorehdr_free(unsigned long long addr) |
60a0c68d | 685 | { |
97b0f6f9 MH |
686 | kfree((void *)(unsigned long)addr); |
687 | } | |
688 | ||
689 | /* | |
690 | * Read from ELF header | |
691 | */ | |
692 | ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos) | |
693 | { | |
694 | void *src = (void *)(unsigned long)*ppos; | |
695 | ||
97b0f6f9 MH |
696 | memcpy(buf, src, count); |
697 | *ppos += count; | |
698 | return count; | |
60a0c68d MH |
699 | } |
700 | ||
97b0f6f9 MH |
701 | /* |
702 | * Read from ELF notes data | |
703 | */ | |
704 | ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos) | |
705 | { | |
706 | void *src = (void *)(unsigned long)*ppos; | |
97b0f6f9 | 707 | |
8a07dd02 | 708 | memcpy(buf, src, count); |
97b0f6f9 MH |
709 | *ppos += count; |
710 | return count; | |
711 | } |