Commit | Line | Data |
---|---|---|
dc009d92 EB |
1 | /* |
2 | * kexec.c - kexec system call | |
3 | * Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com> | |
4 | * | |
5 | * This source code is licensed under the GNU General Public License, | |
6 | * Version 2. See the file COPYING for more details. | |
7 | */ | |
8 | ||
c59ede7b | 9 | #include <linux/capability.h> |
dc009d92 EB |
10 | #include <linux/mm.h> |
11 | #include <linux/file.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/kexec.h> | |
8c5a1cf0 | 15 | #include <linux/mutex.h> |
dc009d92 EB |
16 | #include <linux/list.h> |
17 | #include <linux/highmem.h> | |
18 | #include <linux/syscalls.h> | |
19 | #include <linux/reboot.h> | |
dc009d92 | 20 | #include <linux/ioport.h> |
6e274d14 | 21 | #include <linux/hardirq.h> |
85916f81 MD |
22 | #include <linux/elf.h> |
23 | #include <linux/elfcore.h> | |
fd59d231 KO |
24 | #include <linux/utsname.h> |
25 | #include <linux/numa.h> | |
3ab83521 HY |
26 | #include <linux/suspend.h> |
27 | #include <linux/device.h> | |
89081d17 HY |
28 | #include <linux/freezer.h> |
29 | #include <linux/pm.h> | |
30 | #include <linux/cpu.h> | |
31 | #include <linux/console.h> | |
5f41b8cd | 32 | #include <linux/vmalloc.h> |
06a7f711 | 33 | #include <linux/swap.h> |
19234c08 | 34 | #include <linux/syscore_ops.h> |
52f5684c | 35 | #include <linux/compiler.h> |
6e274d14 | 36 | |
dc009d92 EB |
37 | #include <asm/page.h> |
38 | #include <asm/uaccess.h> | |
39 | #include <asm/io.h> | |
fd59d231 | 40 | #include <asm/sections.h> |
dc009d92 | 41 | |
cc571658 | 42 | /* Per cpu memory for storing cpu states in case of system crash. */ |
43cf38eb | 43 | note_buf_t __percpu *crash_notes; |
cc571658 | 44 | |
fd59d231 | 45 | /* vmcoreinfo stuff */ |
edb79a21 | 46 | static unsigned char vmcoreinfo_data[VMCOREINFO_BYTES]; |
fd59d231 | 47 | u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; |
d768281e KO |
48 | size_t vmcoreinfo_size; |
49 | size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data); | |
fd59d231 | 50 | |
4fc9bbf9 KA |
51 | /* Flag to indicate we are going to kexec a new kernel */ |
52 | bool kexec_in_progress = false; | |
53 | ||
dc009d92 EB |
54 | /* Location of the reserved area for the crash kernel */ |
55 | struct resource crashk_res = { | |
56 | .name = "Crash kernel", | |
57 | .start = 0, | |
58 | .end = 0, | |
59 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM | |
60 | }; | |
0212f915 | 61 | struct resource crashk_low_res = { |
157752d8 | 62 | .name = "Crash kernel", |
0212f915 YL |
63 | .start = 0, |
64 | .end = 0, | |
65 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM | |
66 | }; | |
dc009d92 | 67 | |
6e274d14 AN |
68 | int kexec_should_crash(struct task_struct *p) |
69 | { | |
b460cbc5 | 70 | if (in_interrupt() || !p->pid || is_global_init(p) || panic_on_oops) |
6e274d14 AN |
71 | return 1; |
72 | return 0; | |
73 | } | |
74 | ||
dc009d92 EB |
75 | /* |
76 | * When kexec transitions to the new kernel there is a one-to-one | |
77 | * mapping between physical and virtual addresses. On processors | |
78 | * where you can disable the MMU this is trivial, and easy. For | |
79 | * others it is still a simple predictable page table to setup. | |
80 | * | |
81 | * In that environment kexec copies the new kernel to its final | |
82 | * resting place. This means I can only support memory whose | |
83 | * physical address can fit in an unsigned long. In particular | |
84 | * addresses where (pfn << PAGE_SHIFT) > ULONG_MAX cannot be handled. | |
85 | * If the assembly stub has more restrictive requirements | |
86 | * KEXEC_SOURCE_MEMORY_LIMIT and KEXEC_DEST_MEMORY_LIMIT can be | |
87 | * defined more restrictively in <asm/kexec.h>. | |
88 | * | |
89 | * The code for the transition from the current kernel to the | |
90 | * the new kernel is placed in the control_code_buffer, whose size | |
163f6876 | 91 | * is given by KEXEC_CONTROL_PAGE_SIZE. In the best case only a single |
dc009d92 EB |
92 | * page of memory is necessary, but some architectures require more. |
93 | * Because this memory must be identity mapped in the transition from | |
94 | * virtual to physical addresses it must live in the range | |
95 | * 0 - TASK_SIZE, as only the user space mappings are arbitrarily | |
96 | * modifiable. | |
97 | * | |
98 | * The assembly stub in the control code buffer is passed a linked list | |
99 | * of descriptor pages detailing the source pages of the new kernel, | |
100 | * and the destination addresses of those source pages. As this data | |
101 | * structure is not used in the context of the current OS, it must | |
102 | * be self-contained. | |
103 | * | |
104 | * The code has been made to work with highmem pages and will use a | |
105 | * destination page in its final resting place (if it happens | |
106 | * to allocate it). The end product of this is that most of the | |
107 | * physical address space, and most of RAM can be used. | |
108 | * | |
109 | * Future directions include: | |
110 | * - allocating a page table with the control code buffer identity | |
111 | * mapped, to simplify machine_kexec and make kexec_on_panic more | |
112 | * reliable. | |
113 | */ | |
114 | ||
115 | /* | |
116 | * KIMAGE_NO_DEST is an impossible destination address..., for | |
117 | * allocating pages whose destination address we do not care about. | |
118 | */ | |
119 | #define KIMAGE_NO_DEST (-1UL) | |
120 | ||
72414d3f MS |
121 | static int kimage_is_destination_range(struct kimage *image, |
122 | unsigned long start, unsigned long end); | |
123 | static struct page *kimage_alloc_page(struct kimage *image, | |
9796fdd8 | 124 | gfp_t gfp_mask, |
72414d3f | 125 | unsigned long dest); |
dc009d92 EB |
126 | |
127 | static int do_kimage_alloc(struct kimage **rimage, unsigned long entry, | |
72414d3f MS |
128 | unsigned long nr_segments, |
129 | struct kexec_segment __user *segments) | |
dc009d92 EB |
130 | { |
131 | size_t segment_bytes; | |
132 | struct kimage *image; | |
133 | unsigned long i; | |
134 | int result; | |
135 | ||
136 | /* Allocate a controlling structure */ | |
137 | result = -ENOMEM; | |
4668edc3 | 138 | image = kzalloc(sizeof(*image), GFP_KERNEL); |
72414d3f | 139 | if (!image) |
dc009d92 | 140 | goto out; |
72414d3f | 141 | |
dc009d92 EB |
142 | image->head = 0; |
143 | image->entry = &image->head; | |
144 | image->last_entry = &image->head; | |
145 | image->control_page = ~0; /* By default this does not apply */ | |
146 | image->start = entry; | |
147 | image->type = KEXEC_TYPE_DEFAULT; | |
148 | ||
149 | /* Initialize the list of control pages */ | |
150 | INIT_LIST_HEAD(&image->control_pages); | |
151 | ||
152 | /* Initialize the list of destination pages */ | |
153 | INIT_LIST_HEAD(&image->dest_pages); | |
154 | ||
25985edc | 155 | /* Initialize the list of unusable pages */ |
dc009d92 EB |
156 | INIT_LIST_HEAD(&image->unuseable_pages); |
157 | ||
158 | /* Read in the segments */ | |
159 | image->nr_segments = nr_segments; | |
160 | segment_bytes = nr_segments * sizeof(*segments); | |
161 | result = copy_from_user(image->segment, segments, segment_bytes); | |
f65a03f6 DC |
162 | if (result) { |
163 | result = -EFAULT; | |
dc009d92 | 164 | goto out; |
f65a03f6 | 165 | } |
dc009d92 EB |
166 | |
167 | /* | |
168 | * Verify we have good destination addresses. The caller is | |
169 | * responsible for making certain we don't attempt to load | |
170 | * the new image into invalid or reserved areas of RAM. This | |
171 | * just verifies it is an address we can use. | |
172 | * | |
173 | * Since the kernel does everything in page size chunks ensure | |
b595076a | 174 | * the destination addresses are page aligned. Too many |
dc009d92 EB |
175 | * special cases crop of when we don't do this. The most |
176 | * insidious is getting overlapping destination addresses | |
177 | * simply because addresses are changed to page size | |
178 | * granularity. | |
179 | */ | |
180 | result = -EADDRNOTAVAIL; | |
181 | for (i = 0; i < nr_segments; i++) { | |
182 | unsigned long mstart, mend; | |
72414d3f | 183 | |
dc009d92 EB |
184 | mstart = image->segment[i].mem; |
185 | mend = mstart + image->segment[i].memsz; | |
186 | if ((mstart & ~PAGE_MASK) || (mend & ~PAGE_MASK)) | |
187 | goto out; | |
188 | if (mend >= KEXEC_DESTINATION_MEMORY_LIMIT) | |
189 | goto out; | |
190 | } | |
191 | ||
192 | /* Verify our destination addresses do not overlap. | |
193 | * If we alloed overlapping destination addresses | |
194 | * through very weird things can happen with no | |
195 | * easy explanation as one segment stops on another. | |
196 | */ | |
197 | result = -EINVAL; | |
72414d3f | 198 | for (i = 0; i < nr_segments; i++) { |
dc009d92 EB |
199 | unsigned long mstart, mend; |
200 | unsigned long j; | |
72414d3f | 201 | |
dc009d92 EB |
202 | mstart = image->segment[i].mem; |
203 | mend = mstart + image->segment[i].memsz; | |
72414d3f | 204 | for (j = 0; j < i; j++) { |
dc009d92 EB |
205 | unsigned long pstart, pend; |
206 | pstart = image->segment[j].mem; | |
207 | pend = pstart + image->segment[j].memsz; | |
208 | /* Do the segments overlap ? */ | |
209 | if ((mend > pstart) && (mstart < pend)) | |
210 | goto out; | |
211 | } | |
212 | } | |
213 | ||
214 | /* Ensure our buffer sizes are strictly less than | |
215 | * our memory sizes. This should always be the case, | |
216 | * and it is easier to check up front than to be surprised | |
217 | * later on. | |
218 | */ | |
219 | result = -EINVAL; | |
72414d3f | 220 | for (i = 0; i < nr_segments; i++) { |
dc009d92 EB |
221 | if (image->segment[i].bufsz > image->segment[i].memsz) |
222 | goto out; | |
223 | } | |
224 | ||
dc009d92 | 225 | result = 0; |
72414d3f MS |
226 | out: |
227 | if (result == 0) | |
dc009d92 | 228 | *rimage = image; |
72414d3f | 229 | else |
dc009d92 | 230 | kfree(image); |
72414d3f | 231 | |
dc009d92 EB |
232 | return result; |
233 | ||
234 | } | |
235 | ||
b92e7e0d ZY |
236 | static void kimage_free_page_list(struct list_head *list); |
237 | ||
dc009d92 | 238 | static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry, |
72414d3f MS |
239 | unsigned long nr_segments, |
240 | struct kexec_segment __user *segments) | |
dc009d92 EB |
241 | { |
242 | int result; | |
243 | struct kimage *image; | |
244 | ||
245 | /* Allocate and initialize a controlling structure */ | |
246 | image = NULL; | |
247 | result = do_kimage_alloc(&image, entry, nr_segments, segments); | |
72414d3f | 248 | if (result) |
dc009d92 | 249 | goto out; |
72414d3f | 250 | |
dc009d92 EB |
251 | /* |
252 | * Find a location for the control code buffer, and add it | |
253 | * the vector of segments so that it's pages will also be | |
254 | * counted as destination pages. | |
255 | */ | |
256 | result = -ENOMEM; | |
257 | image->control_code_page = kimage_alloc_control_pages(image, | |
163f6876 | 258 | get_order(KEXEC_CONTROL_PAGE_SIZE)); |
dc009d92 EB |
259 | if (!image->control_code_page) { |
260 | printk(KERN_ERR "Could not allocate control_code_buffer\n"); | |
b92e7e0d | 261 | goto out_free; |
dc009d92 EB |
262 | } |
263 | ||
3ab83521 HY |
264 | image->swap_page = kimage_alloc_control_pages(image, 0); |
265 | if (!image->swap_page) { | |
266 | printk(KERN_ERR "Could not allocate swap buffer\n"); | |
b92e7e0d | 267 | goto out_free; |
3ab83521 HY |
268 | } |
269 | ||
b92e7e0d ZY |
270 | *rimage = image; |
271 | return 0; | |
72414d3f | 272 | |
b92e7e0d ZY |
273 | out_free: |
274 | kimage_free_page_list(&image->control_pages); | |
275 | kfree(image); | |
276 | out: | |
dc009d92 EB |
277 | return result; |
278 | } | |
279 | ||
280 | static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry, | |
72414d3f | 281 | unsigned long nr_segments, |
314b6a4d | 282 | struct kexec_segment __user *segments) |
dc009d92 EB |
283 | { |
284 | int result; | |
285 | struct kimage *image; | |
286 | unsigned long i; | |
287 | ||
288 | image = NULL; | |
289 | /* Verify we have a valid entry point */ | |
290 | if ((entry < crashk_res.start) || (entry > crashk_res.end)) { | |
291 | result = -EADDRNOTAVAIL; | |
292 | goto out; | |
293 | } | |
294 | ||
295 | /* Allocate and initialize a controlling structure */ | |
296 | result = do_kimage_alloc(&image, entry, nr_segments, segments); | |
72414d3f | 297 | if (result) |
dc009d92 | 298 | goto out; |
dc009d92 EB |
299 | |
300 | /* Enable the special crash kernel control page | |
301 | * allocation policy. | |
302 | */ | |
303 | image->control_page = crashk_res.start; | |
304 | image->type = KEXEC_TYPE_CRASH; | |
305 | ||
306 | /* | |
307 | * Verify we have good destination addresses. Normally | |
308 | * the caller is responsible for making certain we don't | |
309 | * attempt to load the new image into invalid or reserved | |
310 | * areas of RAM. But crash kernels are preloaded into a | |
311 | * reserved area of ram. We must ensure the addresses | |
312 | * are in the reserved area otherwise preloading the | |
313 | * kernel could corrupt things. | |
314 | */ | |
315 | result = -EADDRNOTAVAIL; | |
316 | for (i = 0; i < nr_segments; i++) { | |
317 | unsigned long mstart, mend; | |
72414d3f | 318 | |
dc009d92 | 319 | mstart = image->segment[i].mem; |
50cccc69 | 320 | mend = mstart + image->segment[i].memsz - 1; |
dc009d92 EB |
321 | /* Ensure we are within the crash kernel limits */ |
322 | if ((mstart < crashk_res.start) || (mend > crashk_res.end)) | |
8c333ac2 | 323 | goto out_free; |
dc009d92 EB |
324 | } |
325 | ||
dc009d92 EB |
326 | /* |
327 | * Find a location for the control code buffer, and add | |
328 | * the vector of segments so that it's pages will also be | |
329 | * counted as destination pages. | |
330 | */ | |
331 | result = -ENOMEM; | |
332 | image->control_code_page = kimage_alloc_control_pages(image, | |
163f6876 | 333 | get_order(KEXEC_CONTROL_PAGE_SIZE)); |
dc009d92 EB |
334 | if (!image->control_code_page) { |
335 | printk(KERN_ERR "Could not allocate control_code_buffer\n"); | |
8c333ac2 | 336 | goto out_free; |
dc009d92 EB |
337 | } |
338 | ||
8c333ac2 ZY |
339 | *rimage = image; |
340 | return 0; | |
72414d3f | 341 | |
8c333ac2 ZY |
342 | out_free: |
343 | kfree(image); | |
344 | out: | |
dc009d92 EB |
345 | return result; |
346 | } | |
347 | ||
72414d3f MS |
348 | static int kimage_is_destination_range(struct kimage *image, |
349 | unsigned long start, | |
350 | unsigned long end) | |
dc009d92 EB |
351 | { |
352 | unsigned long i; | |
353 | ||
354 | for (i = 0; i < image->nr_segments; i++) { | |
355 | unsigned long mstart, mend; | |
72414d3f | 356 | |
dc009d92 | 357 | mstart = image->segment[i].mem; |
72414d3f MS |
358 | mend = mstart + image->segment[i].memsz; |
359 | if ((end > mstart) && (start < mend)) | |
dc009d92 | 360 | return 1; |
dc009d92 | 361 | } |
72414d3f | 362 | |
dc009d92 EB |
363 | return 0; |
364 | } | |
365 | ||
9796fdd8 | 366 | static struct page *kimage_alloc_pages(gfp_t gfp_mask, unsigned int order) |
dc009d92 EB |
367 | { |
368 | struct page *pages; | |
72414d3f | 369 | |
dc009d92 EB |
370 | pages = alloc_pages(gfp_mask, order); |
371 | if (pages) { | |
372 | unsigned int count, i; | |
373 | pages->mapping = NULL; | |
4c21e2f2 | 374 | set_page_private(pages, order); |
dc009d92 | 375 | count = 1 << order; |
72414d3f | 376 | for (i = 0; i < count; i++) |
dc009d92 | 377 | SetPageReserved(pages + i); |
dc009d92 | 378 | } |
72414d3f | 379 | |
dc009d92 EB |
380 | return pages; |
381 | } | |
382 | ||
383 | static void kimage_free_pages(struct page *page) | |
384 | { | |
385 | unsigned int order, count, i; | |
72414d3f | 386 | |
4c21e2f2 | 387 | order = page_private(page); |
dc009d92 | 388 | count = 1 << order; |
72414d3f | 389 | for (i = 0; i < count; i++) |
dc009d92 | 390 | ClearPageReserved(page + i); |
dc009d92 EB |
391 | __free_pages(page, order); |
392 | } | |
393 | ||
394 | static void kimage_free_page_list(struct list_head *list) | |
395 | { | |
396 | struct list_head *pos, *next; | |
72414d3f | 397 | |
dc009d92 EB |
398 | list_for_each_safe(pos, next, list) { |
399 | struct page *page; | |
400 | ||
401 | page = list_entry(pos, struct page, lru); | |
402 | list_del(&page->lru); | |
dc009d92 EB |
403 | kimage_free_pages(page); |
404 | } | |
405 | } | |
406 | ||
72414d3f MS |
407 | static struct page *kimage_alloc_normal_control_pages(struct kimage *image, |
408 | unsigned int order) | |
dc009d92 EB |
409 | { |
410 | /* Control pages are special, they are the intermediaries | |
411 | * that are needed while we copy the rest of the pages | |
412 | * to their final resting place. As such they must | |
413 | * not conflict with either the destination addresses | |
414 | * or memory the kernel is already using. | |
415 | * | |
416 | * The only case where we really need more than one of | |
417 | * these are for architectures where we cannot disable | |
418 | * the MMU and must instead generate an identity mapped | |
419 | * page table for all of the memory. | |
420 | * | |
421 | * At worst this runs in O(N) of the image size. | |
422 | */ | |
423 | struct list_head extra_pages; | |
424 | struct page *pages; | |
425 | unsigned int count; | |
426 | ||
427 | count = 1 << order; | |
428 | INIT_LIST_HEAD(&extra_pages); | |
429 | ||
430 | /* Loop while I can allocate a page and the page allocated | |
431 | * is a destination page. | |
432 | */ | |
433 | do { | |
434 | unsigned long pfn, epfn, addr, eaddr; | |
72414d3f | 435 | |
dc009d92 EB |
436 | pages = kimage_alloc_pages(GFP_KERNEL, order); |
437 | if (!pages) | |
438 | break; | |
439 | pfn = page_to_pfn(pages); | |
440 | epfn = pfn + count; | |
441 | addr = pfn << PAGE_SHIFT; | |
442 | eaddr = epfn << PAGE_SHIFT; | |
443 | if ((epfn >= (KEXEC_CONTROL_MEMORY_LIMIT >> PAGE_SHIFT)) || | |
72414d3f | 444 | kimage_is_destination_range(image, addr, eaddr)) { |
dc009d92 EB |
445 | list_add(&pages->lru, &extra_pages); |
446 | pages = NULL; | |
447 | } | |
72414d3f MS |
448 | } while (!pages); |
449 | ||
dc009d92 EB |
450 | if (pages) { |
451 | /* Remember the allocated page... */ | |
452 | list_add(&pages->lru, &image->control_pages); | |
453 | ||
454 | /* Because the page is already in it's destination | |
455 | * location we will never allocate another page at | |
456 | * that address. Therefore kimage_alloc_pages | |
457 | * will not return it (again) and we don't need | |
458 | * to give it an entry in image->segment[]. | |
459 | */ | |
460 | } | |
461 | /* Deal with the destination pages I have inadvertently allocated. | |
462 | * | |
463 | * Ideally I would convert multi-page allocations into single | |
25985edc | 464 | * page allocations, and add everything to image->dest_pages. |
dc009d92 EB |
465 | * |
466 | * For now it is simpler to just free the pages. | |
467 | */ | |
468 | kimage_free_page_list(&extra_pages); | |
dc009d92 | 469 | |
72414d3f | 470 | return pages; |
dc009d92 EB |
471 | } |
472 | ||
72414d3f MS |
473 | static struct page *kimage_alloc_crash_control_pages(struct kimage *image, |
474 | unsigned int order) | |
dc009d92 EB |
475 | { |
476 | /* Control pages are special, they are the intermediaries | |
477 | * that are needed while we copy the rest of the pages | |
478 | * to their final resting place. As such they must | |
479 | * not conflict with either the destination addresses | |
480 | * or memory the kernel is already using. | |
481 | * | |
482 | * Control pages are also the only pags we must allocate | |
483 | * when loading a crash kernel. All of the other pages | |
484 | * are specified by the segments and we just memcpy | |
485 | * into them directly. | |
486 | * | |
487 | * The only case where we really need more than one of | |
488 | * these are for architectures where we cannot disable | |
489 | * the MMU and must instead generate an identity mapped | |
490 | * page table for all of the memory. | |
491 | * | |
492 | * Given the low demand this implements a very simple | |
493 | * allocator that finds the first hole of the appropriate | |
494 | * size in the reserved memory region, and allocates all | |
495 | * of the memory up to and including the hole. | |
496 | */ | |
497 | unsigned long hole_start, hole_end, size; | |
498 | struct page *pages; | |
72414d3f | 499 | |
dc009d92 EB |
500 | pages = NULL; |
501 | size = (1 << order) << PAGE_SHIFT; | |
502 | hole_start = (image->control_page + (size - 1)) & ~(size - 1); | |
503 | hole_end = hole_start + size - 1; | |
72414d3f | 504 | while (hole_end <= crashk_res.end) { |
dc009d92 | 505 | unsigned long i; |
72414d3f | 506 | |
3d214fae | 507 | if (hole_end > KEXEC_CRASH_CONTROL_MEMORY_LIMIT) |
dc009d92 | 508 | break; |
dc009d92 | 509 | /* See if I overlap any of the segments */ |
72414d3f | 510 | for (i = 0; i < image->nr_segments; i++) { |
dc009d92 | 511 | unsigned long mstart, mend; |
72414d3f | 512 | |
dc009d92 EB |
513 | mstart = image->segment[i].mem; |
514 | mend = mstart + image->segment[i].memsz - 1; | |
515 | if ((hole_end >= mstart) && (hole_start <= mend)) { | |
516 | /* Advance the hole to the end of the segment */ | |
517 | hole_start = (mend + (size - 1)) & ~(size - 1); | |
518 | hole_end = hole_start + size - 1; | |
519 | break; | |
520 | } | |
521 | } | |
522 | /* If I don't overlap any segments I have found my hole! */ | |
523 | if (i == image->nr_segments) { | |
524 | pages = pfn_to_page(hole_start >> PAGE_SHIFT); | |
525 | break; | |
526 | } | |
527 | } | |
72414d3f | 528 | if (pages) |
dc009d92 | 529 | image->control_page = hole_end; |
72414d3f | 530 | |
dc009d92 EB |
531 | return pages; |
532 | } | |
533 | ||
534 | ||
72414d3f MS |
535 | struct page *kimage_alloc_control_pages(struct kimage *image, |
536 | unsigned int order) | |
dc009d92 EB |
537 | { |
538 | struct page *pages = NULL; | |
72414d3f MS |
539 | |
540 | switch (image->type) { | |
dc009d92 EB |
541 | case KEXEC_TYPE_DEFAULT: |
542 | pages = kimage_alloc_normal_control_pages(image, order); | |
543 | break; | |
544 | case KEXEC_TYPE_CRASH: | |
545 | pages = kimage_alloc_crash_control_pages(image, order); | |
546 | break; | |
547 | } | |
72414d3f | 548 | |
dc009d92 EB |
549 | return pages; |
550 | } | |
551 | ||
552 | static int kimage_add_entry(struct kimage *image, kimage_entry_t entry) | |
553 | { | |
72414d3f | 554 | if (*image->entry != 0) |
dc009d92 | 555 | image->entry++; |
72414d3f | 556 | |
dc009d92 EB |
557 | if (image->entry == image->last_entry) { |
558 | kimage_entry_t *ind_page; | |
559 | struct page *page; | |
72414d3f | 560 | |
dc009d92 | 561 | page = kimage_alloc_page(image, GFP_KERNEL, KIMAGE_NO_DEST); |
72414d3f | 562 | if (!page) |
dc009d92 | 563 | return -ENOMEM; |
72414d3f | 564 | |
dc009d92 EB |
565 | ind_page = page_address(page); |
566 | *image->entry = virt_to_phys(ind_page) | IND_INDIRECTION; | |
567 | image->entry = ind_page; | |
72414d3f MS |
568 | image->last_entry = ind_page + |
569 | ((PAGE_SIZE/sizeof(kimage_entry_t)) - 1); | |
dc009d92 EB |
570 | } |
571 | *image->entry = entry; | |
572 | image->entry++; | |
573 | *image->entry = 0; | |
72414d3f | 574 | |
dc009d92 EB |
575 | return 0; |
576 | } | |
577 | ||
72414d3f MS |
578 | static int kimage_set_destination(struct kimage *image, |
579 | unsigned long destination) | |
dc009d92 EB |
580 | { |
581 | int result; | |
582 | ||
583 | destination &= PAGE_MASK; | |
584 | result = kimage_add_entry(image, destination | IND_DESTINATION); | |
72414d3f | 585 | if (result == 0) |
dc009d92 | 586 | image->destination = destination; |
72414d3f | 587 | |
dc009d92 EB |
588 | return result; |
589 | } | |
590 | ||
591 | ||
592 | static int kimage_add_page(struct kimage *image, unsigned long page) | |
593 | { | |
594 | int result; | |
595 | ||
596 | page &= PAGE_MASK; | |
597 | result = kimage_add_entry(image, page | IND_SOURCE); | |
72414d3f | 598 | if (result == 0) |
dc009d92 | 599 | image->destination += PAGE_SIZE; |
72414d3f | 600 | |
dc009d92 EB |
601 | return result; |
602 | } | |
603 | ||
604 | ||
605 | static void kimage_free_extra_pages(struct kimage *image) | |
606 | { | |
607 | /* Walk through and free any extra destination pages I may have */ | |
608 | kimage_free_page_list(&image->dest_pages); | |
609 | ||
25985edc | 610 | /* Walk through and free any unusable pages I have cached */ |
dc009d92 EB |
611 | kimage_free_page_list(&image->unuseable_pages); |
612 | ||
613 | } | |
7fccf032 | 614 | static void kimage_terminate(struct kimage *image) |
dc009d92 | 615 | { |
72414d3f | 616 | if (*image->entry != 0) |
dc009d92 | 617 | image->entry++; |
72414d3f | 618 | |
dc009d92 | 619 | *image->entry = IND_DONE; |
dc009d92 EB |
620 | } |
621 | ||
622 | #define for_each_kimage_entry(image, ptr, entry) \ | |
623 | for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); \ | |
624 | ptr = (entry & IND_INDIRECTION)? \ | |
625 | phys_to_virt((entry & PAGE_MASK)): ptr +1) | |
626 | ||
627 | static void kimage_free_entry(kimage_entry_t entry) | |
628 | { | |
629 | struct page *page; | |
630 | ||
631 | page = pfn_to_page(entry >> PAGE_SHIFT); | |
632 | kimage_free_pages(page); | |
633 | } | |
634 | ||
635 | static void kimage_free(struct kimage *image) | |
636 | { | |
637 | kimage_entry_t *ptr, entry; | |
638 | kimage_entry_t ind = 0; | |
639 | ||
640 | if (!image) | |
641 | return; | |
72414d3f | 642 | |
dc009d92 EB |
643 | kimage_free_extra_pages(image); |
644 | for_each_kimage_entry(image, ptr, entry) { | |
645 | if (entry & IND_INDIRECTION) { | |
646 | /* Free the previous indirection page */ | |
72414d3f | 647 | if (ind & IND_INDIRECTION) |
dc009d92 | 648 | kimage_free_entry(ind); |
dc009d92 EB |
649 | /* Save this indirection page until we are |
650 | * done with it. | |
651 | */ | |
652 | ind = entry; | |
653 | } | |
72414d3f | 654 | else if (entry & IND_SOURCE) |
dc009d92 | 655 | kimage_free_entry(entry); |
dc009d92 EB |
656 | } |
657 | /* Free the final indirection page */ | |
72414d3f | 658 | if (ind & IND_INDIRECTION) |
dc009d92 | 659 | kimage_free_entry(ind); |
dc009d92 EB |
660 | |
661 | /* Handle any machine specific cleanup */ | |
662 | machine_kexec_cleanup(image); | |
663 | ||
664 | /* Free the kexec control pages... */ | |
665 | kimage_free_page_list(&image->control_pages); | |
666 | kfree(image); | |
667 | } | |
668 | ||
72414d3f MS |
669 | static kimage_entry_t *kimage_dst_used(struct kimage *image, |
670 | unsigned long page) | |
dc009d92 EB |
671 | { |
672 | kimage_entry_t *ptr, entry; | |
673 | unsigned long destination = 0; | |
674 | ||
675 | for_each_kimage_entry(image, ptr, entry) { | |
72414d3f | 676 | if (entry & IND_DESTINATION) |
dc009d92 | 677 | destination = entry & PAGE_MASK; |
dc009d92 | 678 | else if (entry & IND_SOURCE) { |
72414d3f | 679 | if (page == destination) |
dc009d92 | 680 | return ptr; |
dc009d92 EB |
681 | destination += PAGE_SIZE; |
682 | } | |
683 | } | |
72414d3f | 684 | |
314b6a4d | 685 | return NULL; |
dc009d92 EB |
686 | } |
687 | ||
72414d3f | 688 | static struct page *kimage_alloc_page(struct kimage *image, |
9796fdd8 | 689 | gfp_t gfp_mask, |
72414d3f | 690 | unsigned long destination) |
dc009d92 EB |
691 | { |
692 | /* | |
693 | * Here we implement safeguards to ensure that a source page | |
694 | * is not copied to its destination page before the data on | |
695 | * the destination page is no longer useful. | |
696 | * | |
697 | * To do this we maintain the invariant that a source page is | |
698 | * either its own destination page, or it is not a | |
699 | * destination page at all. | |
700 | * | |
701 | * That is slightly stronger than required, but the proof | |
702 | * that no problems will not occur is trivial, and the | |
703 | * implementation is simply to verify. | |
704 | * | |
705 | * When allocating all pages normally this algorithm will run | |
706 | * in O(N) time, but in the worst case it will run in O(N^2) | |
707 | * time. If the runtime is a problem the data structures can | |
708 | * be fixed. | |
709 | */ | |
710 | struct page *page; | |
711 | unsigned long addr; | |
712 | ||
713 | /* | |
714 | * Walk through the list of destination pages, and see if I | |
715 | * have a match. | |
716 | */ | |
717 | list_for_each_entry(page, &image->dest_pages, lru) { | |
718 | addr = page_to_pfn(page) << PAGE_SHIFT; | |
719 | if (addr == destination) { | |
720 | list_del(&page->lru); | |
721 | return page; | |
722 | } | |
723 | } | |
724 | page = NULL; | |
725 | while (1) { | |
726 | kimage_entry_t *old; | |
727 | ||
728 | /* Allocate a page, if we run out of memory give up */ | |
729 | page = kimage_alloc_pages(gfp_mask, 0); | |
72414d3f | 730 | if (!page) |
314b6a4d | 731 | return NULL; |
dc009d92 | 732 | /* If the page cannot be used file it away */ |
72414d3f MS |
733 | if (page_to_pfn(page) > |
734 | (KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) { | |
dc009d92 EB |
735 | list_add(&page->lru, &image->unuseable_pages); |
736 | continue; | |
737 | } | |
738 | addr = page_to_pfn(page) << PAGE_SHIFT; | |
739 | ||
740 | /* If it is the destination page we want use it */ | |
741 | if (addr == destination) | |
742 | break; | |
743 | ||
744 | /* If the page is not a destination page use it */ | |
72414d3f MS |
745 | if (!kimage_is_destination_range(image, addr, |
746 | addr + PAGE_SIZE)) | |
dc009d92 EB |
747 | break; |
748 | ||
749 | /* | |
750 | * I know that the page is someones destination page. | |
751 | * See if there is already a source page for this | |
752 | * destination page. And if so swap the source pages. | |
753 | */ | |
754 | old = kimage_dst_used(image, addr); | |
755 | if (old) { | |
756 | /* If so move it */ | |
757 | unsigned long old_addr; | |
758 | struct page *old_page; | |
759 | ||
760 | old_addr = *old & PAGE_MASK; | |
761 | old_page = pfn_to_page(old_addr >> PAGE_SHIFT); | |
762 | copy_highpage(page, old_page); | |
763 | *old = addr | (*old & ~PAGE_MASK); | |
764 | ||
765 | /* The old page I have found cannot be a | |
f9092f35 JS |
766 | * destination page, so return it if it's |
767 | * gfp_flags honor the ones passed in. | |
dc009d92 | 768 | */ |
f9092f35 JS |
769 | if (!(gfp_mask & __GFP_HIGHMEM) && |
770 | PageHighMem(old_page)) { | |
771 | kimage_free_pages(old_page); | |
772 | continue; | |
773 | } | |
dc009d92 EB |
774 | addr = old_addr; |
775 | page = old_page; | |
776 | break; | |
777 | } | |
778 | else { | |
779 | /* Place the page on the destination list I | |
780 | * will use it later. | |
781 | */ | |
782 | list_add(&page->lru, &image->dest_pages); | |
783 | } | |
784 | } | |
72414d3f | 785 | |
dc009d92 EB |
786 | return page; |
787 | } | |
788 | ||
789 | static int kimage_load_normal_segment(struct kimage *image, | |
72414d3f | 790 | struct kexec_segment *segment) |
dc009d92 EB |
791 | { |
792 | unsigned long maddr; | |
310faaa9 | 793 | size_t ubytes, mbytes; |
dc009d92 | 794 | int result; |
314b6a4d | 795 | unsigned char __user *buf; |
dc009d92 EB |
796 | |
797 | result = 0; | |
798 | buf = segment->buf; | |
799 | ubytes = segment->bufsz; | |
800 | mbytes = segment->memsz; | |
801 | maddr = segment->mem; | |
802 | ||
803 | result = kimage_set_destination(image, maddr); | |
72414d3f | 804 | if (result < 0) |
dc009d92 | 805 | goto out; |
72414d3f MS |
806 | |
807 | while (mbytes) { | |
dc009d92 EB |
808 | struct page *page; |
809 | char *ptr; | |
810 | size_t uchunk, mchunk; | |
72414d3f | 811 | |
dc009d92 | 812 | page = kimage_alloc_page(image, GFP_HIGHUSER, maddr); |
c80544dc | 813 | if (!page) { |
dc009d92 EB |
814 | result = -ENOMEM; |
815 | goto out; | |
816 | } | |
72414d3f MS |
817 | result = kimage_add_page(image, page_to_pfn(page) |
818 | << PAGE_SHIFT); | |
819 | if (result < 0) | |
dc009d92 | 820 | goto out; |
72414d3f | 821 | |
dc009d92 EB |
822 | ptr = kmap(page); |
823 | /* Start with a clear page */ | |
3ecb01df | 824 | clear_page(ptr); |
dc009d92 | 825 | ptr += maddr & ~PAGE_MASK; |
31c3a3fe ZY |
826 | mchunk = min_t(size_t, mbytes, |
827 | PAGE_SIZE - (maddr & ~PAGE_MASK)); | |
828 | uchunk = min(ubytes, mchunk); | |
72414d3f | 829 | |
dc009d92 EB |
830 | result = copy_from_user(ptr, buf, uchunk); |
831 | kunmap(page); | |
832 | if (result) { | |
f65a03f6 | 833 | result = -EFAULT; |
dc009d92 EB |
834 | goto out; |
835 | } | |
836 | ubytes -= uchunk; | |
837 | maddr += mchunk; | |
838 | buf += mchunk; | |
839 | mbytes -= mchunk; | |
840 | } | |
72414d3f | 841 | out: |
dc009d92 EB |
842 | return result; |
843 | } | |
844 | ||
845 | static int kimage_load_crash_segment(struct kimage *image, | |
72414d3f | 846 | struct kexec_segment *segment) |
dc009d92 EB |
847 | { |
848 | /* For crash dumps kernels we simply copy the data from | |
849 | * user space to it's destination. | |
850 | * We do things a page at a time for the sake of kmap. | |
851 | */ | |
852 | unsigned long maddr; | |
310faaa9 | 853 | size_t ubytes, mbytes; |
dc009d92 | 854 | int result; |
314b6a4d | 855 | unsigned char __user *buf; |
dc009d92 EB |
856 | |
857 | result = 0; | |
858 | buf = segment->buf; | |
859 | ubytes = segment->bufsz; | |
860 | mbytes = segment->memsz; | |
861 | maddr = segment->mem; | |
72414d3f | 862 | while (mbytes) { |
dc009d92 EB |
863 | struct page *page; |
864 | char *ptr; | |
865 | size_t uchunk, mchunk; | |
72414d3f | 866 | |
dc009d92 | 867 | page = pfn_to_page(maddr >> PAGE_SHIFT); |
c80544dc | 868 | if (!page) { |
dc009d92 EB |
869 | result = -ENOMEM; |
870 | goto out; | |
871 | } | |
872 | ptr = kmap(page); | |
873 | ptr += maddr & ~PAGE_MASK; | |
31c3a3fe ZY |
874 | mchunk = min_t(size_t, mbytes, |
875 | PAGE_SIZE - (maddr & ~PAGE_MASK)); | |
876 | uchunk = min(ubytes, mchunk); | |
877 | if (mchunk > uchunk) { | |
dc009d92 EB |
878 | /* Zero the trailing part of the page */ |
879 | memset(ptr + uchunk, 0, mchunk - uchunk); | |
880 | } | |
881 | result = copy_from_user(ptr, buf, uchunk); | |
a7956113 | 882 | kexec_flush_icache_page(page); |
dc009d92 EB |
883 | kunmap(page); |
884 | if (result) { | |
f65a03f6 | 885 | result = -EFAULT; |
dc009d92 EB |
886 | goto out; |
887 | } | |
888 | ubytes -= uchunk; | |
889 | maddr += mchunk; | |
890 | buf += mchunk; | |
891 | mbytes -= mchunk; | |
892 | } | |
72414d3f | 893 | out: |
dc009d92 EB |
894 | return result; |
895 | } | |
896 | ||
897 | static int kimage_load_segment(struct kimage *image, | |
72414d3f | 898 | struct kexec_segment *segment) |
dc009d92 EB |
899 | { |
900 | int result = -ENOMEM; | |
72414d3f MS |
901 | |
902 | switch (image->type) { | |
dc009d92 EB |
903 | case KEXEC_TYPE_DEFAULT: |
904 | result = kimage_load_normal_segment(image, segment); | |
905 | break; | |
906 | case KEXEC_TYPE_CRASH: | |
907 | result = kimage_load_crash_segment(image, segment); | |
908 | break; | |
909 | } | |
72414d3f | 910 | |
dc009d92 EB |
911 | return result; |
912 | } | |
913 | ||
914 | /* | |
915 | * Exec Kernel system call: for obvious reasons only root may call it. | |
916 | * | |
917 | * This call breaks up into three pieces. | |
918 | * - A generic part which loads the new kernel from the current | |
919 | * address space, and very carefully places the data in the | |
920 | * allocated pages. | |
921 | * | |
922 | * - A generic part that interacts with the kernel and tells all of | |
923 | * the devices to shut down. Preventing on-going dmas, and placing | |
924 | * the devices in a consistent state so a later kernel can | |
925 | * reinitialize them. | |
926 | * | |
927 | * - A machine specific part that includes the syscall number | |
002ace78 | 928 | * and then copies the image to it's final destination. And |
dc009d92 EB |
929 | * jumps into the image at entry. |
930 | * | |
931 | * kexec does not sync, or unmount filesystems so if you need | |
932 | * that to happen you need to do that yourself. | |
933 | */ | |
c330dda9 JM |
934 | struct kimage *kexec_image; |
935 | struct kimage *kexec_crash_image; | |
7984754b | 936 | int kexec_load_disabled; |
8c5a1cf0 AM |
937 | |
938 | static DEFINE_MUTEX(kexec_mutex); | |
dc009d92 | 939 | |
754fe8d2 HC |
940 | SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, |
941 | struct kexec_segment __user *, segments, unsigned long, flags) | |
dc009d92 EB |
942 | { |
943 | struct kimage **dest_image, *image; | |
dc009d92 EB |
944 | int result; |
945 | ||
946 | /* We only trust the superuser with rebooting the system. */ | |
7984754b | 947 | if (!capable(CAP_SYS_BOOT) || kexec_load_disabled) |
dc009d92 EB |
948 | return -EPERM; |
949 | ||
950 | /* | |
951 | * Verify we have a legal set of flags | |
952 | * This leaves us room for future extensions. | |
953 | */ | |
954 | if ((flags & KEXEC_FLAGS) != (flags & ~KEXEC_ARCH_MASK)) | |
955 | return -EINVAL; | |
956 | ||
957 | /* Verify we are on the appropriate architecture */ | |
958 | if (((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH) && | |
959 | ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT)) | |
dc009d92 | 960 | return -EINVAL; |
dc009d92 EB |
961 | |
962 | /* Put an artificial cap on the number | |
963 | * of segments passed to kexec_load. | |
964 | */ | |
965 | if (nr_segments > KEXEC_SEGMENT_MAX) | |
966 | return -EINVAL; | |
967 | ||
968 | image = NULL; | |
969 | result = 0; | |
970 | ||
971 | /* Because we write directly to the reserved memory | |
972 | * region when loading crash kernels we need a mutex here to | |
973 | * prevent multiple crash kernels from attempting to load | |
974 | * simultaneously, and to prevent a crash kernel from loading | |
975 | * over the top of a in use crash kernel. | |
976 | * | |
977 | * KISS: always take the mutex. | |
978 | */ | |
8c5a1cf0 | 979 | if (!mutex_trylock(&kexec_mutex)) |
dc009d92 | 980 | return -EBUSY; |
72414d3f | 981 | |
dc009d92 | 982 | dest_image = &kexec_image; |
72414d3f | 983 | if (flags & KEXEC_ON_CRASH) |
dc009d92 | 984 | dest_image = &kexec_crash_image; |
dc009d92 EB |
985 | if (nr_segments > 0) { |
986 | unsigned long i; | |
72414d3f | 987 | |
dc009d92 | 988 | /* Loading another kernel to reboot into */ |
72414d3f MS |
989 | if ((flags & KEXEC_ON_CRASH) == 0) |
990 | result = kimage_normal_alloc(&image, entry, | |
991 | nr_segments, segments); | |
dc009d92 EB |
992 | /* Loading another kernel to switch to if this one crashes */ |
993 | else if (flags & KEXEC_ON_CRASH) { | |
994 | /* Free any current crash dump kernel before | |
995 | * we corrupt it. | |
996 | */ | |
997 | kimage_free(xchg(&kexec_crash_image, NULL)); | |
72414d3f MS |
998 | result = kimage_crash_alloc(&image, entry, |
999 | nr_segments, segments); | |
558df720 | 1000 | crash_map_reserved_pages(); |
dc009d92 | 1001 | } |
72414d3f | 1002 | if (result) |
dc009d92 | 1003 | goto out; |
72414d3f | 1004 | |
3ab83521 HY |
1005 | if (flags & KEXEC_PRESERVE_CONTEXT) |
1006 | image->preserve_context = 1; | |
dc009d92 | 1007 | result = machine_kexec_prepare(image); |
72414d3f | 1008 | if (result) |
dc009d92 | 1009 | goto out; |
72414d3f MS |
1010 | |
1011 | for (i = 0; i < nr_segments; i++) { | |
dc009d92 | 1012 | result = kimage_load_segment(image, &image->segment[i]); |
72414d3f | 1013 | if (result) |
dc009d92 | 1014 | goto out; |
dc009d92 | 1015 | } |
7fccf032 | 1016 | kimage_terminate(image); |
558df720 MH |
1017 | if (flags & KEXEC_ON_CRASH) |
1018 | crash_unmap_reserved_pages(); | |
dc009d92 EB |
1019 | } |
1020 | /* Install the new kernel, and Uninstall the old */ | |
1021 | image = xchg(dest_image, image); | |
1022 | ||
72414d3f | 1023 | out: |
8c5a1cf0 | 1024 | mutex_unlock(&kexec_mutex); |
dc009d92 | 1025 | kimage_free(image); |
72414d3f | 1026 | |
dc009d92 EB |
1027 | return result; |
1028 | } | |
1029 | ||
558df720 MH |
1030 | /* |
1031 | * Add and remove page tables for crashkernel memory | |
1032 | * | |
1033 | * Provide an empty default implementation here -- architecture | |
1034 | * code may override this | |
1035 | */ | |
1036 | void __weak crash_map_reserved_pages(void) | |
1037 | {} | |
1038 | ||
1039 | void __weak crash_unmap_reserved_pages(void) | |
1040 | {} | |
1041 | ||
dc009d92 | 1042 | #ifdef CONFIG_COMPAT |
ca2c405a HC |
1043 | COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry, |
1044 | compat_ulong_t, nr_segments, | |
1045 | struct compat_kexec_segment __user *, segments, | |
1046 | compat_ulong_t, flags) | |
dc009d92 EB |
1047 | { |
1048 | struct compat_kexec_segment in; | |
1049 | struct kexec_segment out, __user *ksegments; | |
1050 | unsigned long i, result; | |
1051 | ||
1052 | /* Don't allow clients that don't understand the native | |
1053 | * architecture to do anything. | |
1054 | */ | |
72414d3f | 1055 | if ((flags & KEXEC_ARCH_MASK) == KEXEC_ARCH_DEFAULT) |
dc009d92 | 1056 | return -EINVAL; |
dc009d92 | 1057 | |
72414d3f | 1058 | if (nr_segments > KEXEC_SEGMENT_MAX) |
dc009d92 | 1059 | return -EINVAL; |
dc009d92 EB |
1060 | |
1061 | ksegments = compat_alloc_user_space(nr_segments * sizeof(out)); | |
1062 | for (i=0; i < nr_segments; i++) { | |
1063 | result = copy_from_user(&in, &segments[i], sizeof(in)); | |
72414d3f | 1064 | if (result) |
dc009d92 | 1065 | return -EFAULT; |
dc009d92 EB |
1066 | |
1067 | out.buf = compat_ptr(in.buf); | |
1068 | out.bufsz = in.bufsz; | |
1069 | out.mem = in.mem; | |
1070 | out.memsz = in.memsz; | |
1071 | ||
1072 | result = copy_to_user(&ksegments[i], &out, sizeof(out)); | |
72414d3f | 1073 | if (result) |
dc009d92 | 1074 | return -EFAULT; |
dc009d92 EB |
1075 | } |
1076 | ||
1077 | return sys_kexec_load(entry, nr_segments, ksegments, flags); | |
1078 | } | |
1079 | #endif | |
1080 | ||
6e274d14 | 1081 | void crash_kexec(struct pt_regs *regs) |
dc009d92 | 1082 | { |
8c5a1cf0 | 1083 | /* Take the kexec_mutex here to prevent sys_kexec_load |
dc009d92 EB |
1084 | * running on one cpu from replacing the crash kernel |
1085 | * we are using after a panic on a different cpu. | |
1086 | * | |
1087 | * If the crash kernel was not located in a fixed area | |
1088 | * of memory the xchg(&kexec_crash_image) would be | |
1089 | * sufficient. But since I reuse the memory... | |
1090 | */ | |
8c5a1cf0 | 1091 | if (mutex_trylock(&kexec_mutex)) { |
c0ce7d08 | 1092 | if (kexec_crash_image) { |
e996e581 | 1093 | struct pt_regs fixed_regs; |
0f4bd46e | 1094 | |
e996e581 | 1095 | crash_setup_regs(&fixed_regs, regs); |
fd59d231 | 1096 | crash_save_vmcoreinfo(); |
e996e581 | 1097 | machine_crash_shutdown(&fixed_regs); |
c0ce7d08 | 1098 | machine_kexec(kexec_crash_image); |
dc009d92 | 1099 | } |
8c5a1cf0 | 1100 | mutex_unlock(&kexec_mutex); |
dc009d92 EB |
1101 | } |
1102 | } | |
cc571658 | 1103 | |
06a7f711 AW |
1104 | size_t crash_get_memory_size(void) |
1105 | { | |
e05bd336 | 1106 | size_t size = 0; |
06a7f711 | 1107 | mutex_lock(&kexec_mutex); |
e05bd336 | 1108 | if (crashk_res.end != crashk_res.start) |
28f65c11 | 1109 | size = resource_size(&crashk_res); |
06a7f711 AW |
1110 | mutex_unlock(&kexec_mutex); |
1111 | return size; | |
1112 | } | |
1113 | ||
c0bb9e45 AB |
1114 | void __weak crash_free_reserved_phys_range(unsigned long begin, |
1115 | unsigned long end) | |
06a7f711 AW |
1116 | { |
1117 | unsigned long addr; | |
1118 | ||
e07cee23 JL |
1119 | for (addr = begin; addr < end; addr += PAGE_SIZE) |
1120 | free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT)); | |
06a7f711 AW |
1121 | } |
1122 | ||
1123 | int crash_shrink_memory(unsigned long new_size) | |
1124 | { | |
1125 | int ret = 0; | |
1126 | unsigned long start, end; | |
bec013c4 | 1127 | unsigned long old_size; |
6480e5a0 | 1128 | struct resource *ram_res; |
06a7f711 AW |
1129 | |
1130 | mutex_lock(&kexec_mutex); | |
1131 | ||
1132 | if (kexec_crash_image) { | |
1133 | ret = -ENOENT; | |
1134 | goto unlock; | |
1135 | } | |
1136 | start = crashk_res.start; | |
1137 | end = crashk_res.end; | |
bec013c4 MH |
1138 | old_size = (end == 0) ? 0 : end - start + 1; |
1139 | if (new_size >= old_size) { | |
1140 | ret = (new_size == old_size) ? 0 : -EINVAL; | |
06a7f711 AW |
1141 | goto unlock; |
1142 | } | |
1143 | ||
6480e5a0 MH |
1144 | ram_res = kzalloc(sizeof(*ram_res), GFP_KERNEL); |
1145 | if (!ram_res) { | |
1146 | ret = -ENOMEM; | |
1147 | goto unlock; | |
1148 | } | |
1149 | ||
558df720 MH |
1150 | start = roundup(start, KEXEC_CRASH_MEM_ALIGN); |
1151 | end = roundup(start + new_size, KEXEC_CRASH_MEM_ALIGN); | |
06a7f711 | 1152 | |
558df720 | 1153 | crash_map_reserved_pages(); |
c0bb9e45 | 1154 | crash_free_reserved_phys_range(end, crashk_res.end); |
06a7f711 | 1155 | |
e05bd336 | 1156 | if ((start == end) && (crashk_res.parent != NULL)) |
06a7f711 | 1157 | release_resource(&crashk_res); |
6480e5a0 MH |
1158 | |
1159 | ram_res->start = end; | |
1160 | ram_res->end = crashk_res.end; | |
1161 | ram_res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; | |
1162 | ram_res->name = "System RAM"; | |
1163 | ||
475f9aa6 | 1164 | crashk_res.end = end - 1; |
6480e5a0 MH |
1165 | |
1166 | insert_resource(&iomem_resource, ram_res); | |
558df720 | 1167 | crash_unmap_reserved_pages(); |
06a7f711 AW |
1168 | |
1169 | unlock: | |
1170 | mutex_unlock(&kexec_mutex); | |
1171 | return ret; | |
1172 | } | |
1173 | ||
85916f81 MD |
1174 | static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data, |
1175 | size_t data_len) | |
1176 | { | |
1177 | struct elf_note note; | |
1178 | ||
1179 | note.n_namesz = strlen(name) + 1; | |
1180 | note.n_descsz = data_len; | |
1181 | note.n_type = type; | |
1182 | memcpy(buf, ¬e, sizeof(note)); | |
1183 | buf += (sizeof(note) + 3)/4; | |
1184 | memcpy(buf, name, note.n_namesz); | |
1185 | buf += (note.n_namesz + 3)/4; | |
1186 | memcpy(buf, data, note.n_descsz); | |
1187 | buf += (note.n_descsz + 3)/4; | |
1188 | ||
1189 | return buf; | |
1190 | } | |
1191 | ||
1192 | static void final_note(u32 *buf) | |
1193 | { | |
1194 | struct elf_note note; | |
1195 | ||
1196 | note.n_namesz = 0; | |
1197 | note.n_descsz = 0; | |
1198 | note.n_type = 0; | |
1199 | memcpy(buf, ¬e, sizeof(note)); | |
1200 | } | |
1201 | ||
1202 | void crash_save_cpu(struct pt_regs *regs, int cpu) | |
1203 | { | |
1204 | struct elf_prstatus prstatus; | |
1205 | u32 *buf; | |
1206 | ||
4f4b6c1a | 1207 | if ((cpu < 0) || (cpu >= nr_cpu_ids)) |
85916f81 MD |
1208 | return; |
1209 | ||
1210 | /* Using ELF notes here is opportunistic. | |
1211 | * I need a well defined structure format | |
1212 | * for the data I pass, and I need tags | |
1213 | * on the data to indicate what information I have | |
1214 | * squirrelled away. ELF notes happen to provide | |
1215 | * all of that, so there is no need to invent something new. | |
1216 | */ | |
1217 | buf = (u32*)per_cpu_ptr(crash_notes, cpu); | |
1218 | if (!buf) | |
1219 | return; | |
1220 | memset(&prstatus, 0, sizeof(prstatus)); | |
1221 | prstatus.pr_pid = current->pid; | |
6cd61c0b | 1222 | elf_core_copy_kernel_regs(&prstatus.pr_reg, regs); |
6672f76a SH |
1223 | buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, |
1224 | &prstatus, sizeof(prstatus)); | |
85916f81 MD |
1225 | final_note(buf); |
1226 | } | |
1227 | ||
cc571658 VG |
1228 | static int __init crash_notes_memory_init(void) |
1229 | { | |
1230 | /* Allocate memory for saving cpu registers. */ | |
1231 | crash_notes = alloc_percpu(note_buf_t); | |
1232 | if (!crash_notes) { | |
1233 | printk("Kexec: Memory allocation for saving cpu register" | |
1234 | " states failed\n"); | |
1235 | return -ENOMEM; | |
1236 | } | |
1237 | return 0; | |
1238 | } | |
c96d6660 | 1239 | subsys_initcall(crash_notes_memory_init); |
fd59d231 | 1240 | |
cba63c30 BW |
1241 | |
1242 | /* | |
1243 | * parsing the "crashkernel" commandline | |
1244 | * | |
1245 | * this code is intended to be called from architecture specific code | |
1246 | */ | |
1247 | ||
1248 | ||
1249 | /* | |
1250 | * This function parses command lines in the format | |
1251 | * | |
1252 | * crashkernel=ramsize-range:size[,...][@offset] | |
1253 | * | |
1254 | * The function returns 0 on success and -EINVAL on failure. | |
1255 | */ | |
1256 | static int __init parse_crashkernel_mem(char *cmdline, | |
1257 | unsigned long long system_ram, | |
1258 | unsigned long long *crash_size, | |
1259 | unsigned long long *crash_base) | |
1260 | { | |
1261 | char *cur = cmdline, *tmp; | |
1262 | ||
1263 | /* for each entry of the comma-separated list */ | |
1264 | do { | |
1265 | unsigned long long start, end = ULLONG_MAX, size; | |
1266 | ||
1267 | /* get the start of the range */ | |
1268 | start = memparse(cur, &tmp); | |
1269 | if (cur == tmp) { | |
1270 | pr_warning("crashkernel: Memory value expected\n"); | |
1271 | return -EINVAL; | |
1272 | } | |
1273 | cur = tmp; | |
1274 | if (*cur != '-') { | |
1275 | pr_warning("crashkernel: '-' expected\n"); | |
1276 | return -EINVAL; | |
1277 | } | |
1278 | cur++; | |
1279 | ||
1280 | /* if no ':' is here, than we read the end */ | |
1281 | if (*cur != ':') { | |
1282 | end = memparse(cur, &tmp); | |
1283 | if (cur == tmp) { | |
1284 | pr_warning("crashkernel: Memory " | |
1285 | "value expected\n"); | |
1286 | return -EINVAL; | |
1287 | } | |
1288 | cur = tmp; | |
1289 | if (end <= start) { | |
1290 | pr_warning("crashkernel: end <= start\n"); | |
1291 | return -EINVAL; | |
1292 | } | |
1293 | } | |
1294 | ||
1295 | if (*cur != ':') { | |
1296 | pr_warning("crashkernel: ':' expected\n"); | |
1297 | return -EINVAL; | |
1298 | } | |
1299 | cur++; | |
1300 | ||
1301 | size = memparse(cur, &tmp); | |
1302 | if (cur == tmp) { | |
1303 | pr_warning("Memory value expected\n"); | |
1304 | return -EINVAL; | |
1305 | } | |
1306 | cur = tmp; | |
1307 | if (size >= system_ram) { | |
1308 | pr_warning("crashkernel: invalid size\n"); | |
1309 | return -EINVAL; | |
1310 | } | |
1311 | ||
1312 | /* match ? */ | |
be089d79 | 1313 | if (system_ram >= start && system_ram < end) { |
cba63c30 BW |
1314 | *crash_size = size; |
1315 | break; | |
1316 | } | |
1317 | } while (*cur++ == ','); | |
1318 | ||
1319 | if (*crash_size > 0) { | |
11c7da4b | 1320 | while (*cur && *cur != ' ' && *cur != '@') |
cba63c30 BW |
1321 | cur++; |
1322 | if (*cur == '@') { | |
1323 | cur++; | |
1324 | *crash_base = memparse(cur, &tmp); | |
1325 | if (cur == tmp) { | |
1326 | pr_warning("Memory value expected " | |
1327 | "after '@'\n"); | |
1328 | return -EINVAL; | |
1329 | } | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | /* | |
1337 | * That function parses "simple" (old) crashkernel command lines like | |
1338 | * | |
1339 | * crashkernel=size[@offset] | |
1340 | * | |
1341 | * It returns 0 on success and -EINVAL on failure. | |
1342 | */ | |
1343 | static int __init parse_crashkernel_simple(char *cmdline, | |
1344 | unsigned long long *crash_size, | |
1345 | unsigned long long *crash_base) | |
1346 | { | |
1347 | char *cur = cmdline; | |
1348 | ||
1349 | *crash_size = memparse(cmdline, &cur); | |
1350 | if (cmdline == cur) { | |
1351 | pr_warning("crashkernel: memory value expected\n"); | |
1352 | return -EINVAL; | |
1353 | } | |
1354 | ||
1355 | if (*cur == '@') | |
1356 | *crash_base = memparse(cur+1, &cur); | |
eaa3be6a ZD |
1357 | else if (*cur != ' ' && *cur != '\0') { |
1358 | pr_warning("crashkernel: unrecognized char\n"); | |
1359 | return -EINVAL; | |
1360 | } | |
cba63c30 BW |
1361 | |
1362 | return 0; | |
1363 | } | |
1364 | ||
adbc742b YL |
1365 | #define SUFFIX_HIGH 0 |
1366 | #define SUFFIX_LOW 1 | |
1367 | #define SUFFIX_NULL 2 | |
1368 | static __initdata char *suffix_tbl[] = { | |
1369 | [SUFFIX_HIGH] = ",high", | |
1370 | [SUFFIX_LOW] = ",low", | |
1371 | [SUFFIX_NULL] = NULL, | |
1372 | }; | |
1373 | ||
cba63c30 | 1374 | /* |
adbc742b YL |
1375 | * That function parses "suffix" crashkernel command lines like |
1376 | * | |
1377 | * crashkernel=size,[high|low] | |
1378 | * | |
1379 | * It returns 0 on success and -EINVAL on failure. | |
cba63c30 | 1380 | */ |
adbc742b YL |
1381 | static int __init parse_crashkernel_suffix(char *cmdline, |
1382 | unsigned long long *crash_size, | |
1383 | unsigned long long *crash_base, | |
1384 | const char *suffix) | |
1385 | { | |
1386 | char *cur = cmdline; | |
1387 | ||
1388 | *crash_size = memparse(cmdline, &cur); | |
1389 | if (cmdline == cur) { | |
1390 | pr_warn("crashkernel: memory value expected\n"); | |
1391 | return -EINVAL; | |
1392 | } | |
1393 | ||
1394 | /* check with suffix */ | |
1395 | if (strncmp(cur, suffix, strlen(suffix))) { | |
1396 | pr_warn("crashkernel: unrecognized char\n"); | |
1397 | return -EINVAL; | |
1398 | } | |
1399 | cur += strlen(suffix); | |
1400 | if (*cur != ' ' && *cur != '\0') { | |
1401 | pr_warn("crashkernel: unrecognized char\n"); | |
1402 | return -EINVAL; | |
1403 | } | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | static __init char *get_last_crashkernel(char *cmdline, | |
1409 | const char *name, | |
1410 | const char *suffix) | |
1411 | { | |
1412 | char *p = cmdline, *ck_cmdline = NULL; | |
1413 | ||
1414 | /* find crashkernel and use the last one if there are more */ | |
1415 | p = strstr(p, name); | |
1416 | while (p) { | |
1417 | char *end_p = strchr(p, ' '); | |
1418 | char *q; | |
1419 | ||
1420 | if (!end_p) | |
1421 | end_p = p + strlen(p); | |
1422 | ||
1423 | if (!suffix) { | |
1424 | int i; | |
1425 | ||
1426 | /* skip the one with any known suffix */ | |
1427 | for (i = 0; suffix_tbl[i]; i++) { | |
1428 | q = end_p - strlen(suffix_tbl[i]); | |
1429 | if (!strncmp(q, suffix_tbl[i], | |
1430 | strlen(suffix_tbl[i]))) | |
1431 | goto next; | |
1432 | } | |
1433 | ck_cmdline = p; | |
1434 | } else { | |
1435 | q = end_p - strlen(suffix); | |
1436 | if (!strncmp(q, suffix, strlen(suffix))) | |
1437 | ck_cmdline = p; | |
1438 | } | |
1439 | next: | |
1440 | p = strstr(p+1, name); | |
1441 | } | |
1442 | ||
1443 | if (!ck_cmdline) | |
1444 | return NULL; | |
1445 | ||
1446 | return ck_cmdline; | |
1447 | } | |
1448 | ||
0212f915 | 1449 | static int __init __parse_crashkernel(char *cmdline, |
cba63c30 BW |
1450 | unsigned long long system_ram, |
1451 | unsigned long long *crash_size, | |
0212f915 | 1452 | unsigned long long *crash_base, |
adbc742b YL |
1453 | const char *name, |
1454 | const char *suffix) | |
cba63c30 | 1455 | { |
cba63c30 | 1456 | char *first_colon, *first_space; |
adbc742b | 1457 | char *ck_cmdline; |
cba63c30 BW |
1458 | |
1459 | BUG_ON(!crash_size || !crash_base); | |
1460 | *crash_size = 0; | |
1461 | *crash_base = 0; | |
1462 | ||
adbc742b | 1463 | ck_cmdline = get_last_crashkernel(cmdline, name, suffix); |
cba63c30 BW |
1464 | |
1465 | if (!ck_cmdline) | |
1466 | return -EINVAL; | |
1467 | ||
0212f915 | 1468 | ck_cmdline += strlen(name); |
cba63c30 | 1469 | |
adbc742b YL |
1470 | if (suffix) |
1471 | return parse_crashkernel_suffix(ck_cmdline, crash_size, | |
1472 | crash_base, suffix); | |
cba63c30 BW |
1473 | /* |
1474 | * if the commandline contains a ':', then that's the extended | |
1475 | * syntax -- if not, it must be the classic syntax | |
1476 | */ | |
1477 | first_colon = strchr(ck_cmdline, ':'); | |
1478 | first_space = strchr(ck_cmdline, ' '); | |
1479 | if (first_colon && (!first_space || first_colon < first_space)) | |
1480 | return parse_crashkernel_mem(ck_cmdline, system_ram, | |
1481 | crash_size, crash_base); | |
cba63c30 | 1482 | |
80c74f6a | 1483 | return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base); |
cba63c30 BW |
1484 | } |
1485 | ||
adbc742b YL |
1486 | /* |
1487 | * That function is the entry point for command line parsing and should be | |
1488 | * called from the arch-specific code. | |
1489 | */ | |
0212f915 YL |
1490 | int __init parse_crashkernel(char *cmdline, |
1491 | unsigned long long system_ram, | |
1492 | unsigned long long *crash_size, | |
1493 | unsigned long long *crash_base) | |
1494 | { | |
1495 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
adbc742b | 1496 | "crashkernel=", NULL); |
0212f915 | 1497 | } |
55a20ee7 YL |
1498 | |
1499 | int __init parse_crashkernel_high(char *cmdline, | |
1500 | unsigned long long system_ram, | |
1501 | unsigned long long *crash_size, | |
1502 | unsigned long long *crash_base) | |
1503 | { | |
1504 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
adbc742b | 1505 | "crashkernel=", suffix_tbl[SUFFIX_HIGH]); |
55a20ee7 | 1506 | } |
0212f915 YL |
1507 | |
1508 | int __init parse_crashkernel_low(char *cmdline, | |
1509 | unsigned long long system_ram, | |
1510 | unsigned long long *crash_size, | |
1511 | unsigned long long *crash_base) | |
1512 | { | |
1513 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
adbc742b | 1514 | "crashkernel=", suffix_tbl[SUFFIX_LOW]); |
0212f915 | 1515 | } |
cba63c30 | 1516 | |
fa8ff292 | 1517 | static void update_vmcoreinfo_note(void) |
fd59d231 | 1518 | { |
fa8ff292 | 1519 | u32 *buf = vmcoreinfo_note; |
fd59d231 KO |
1520 | |
1521 | if (!vmcoreinfo_size) | |
1522 | return; | |
fd59d231 KO |
1523 | buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data, |
1524 | vmcoreinfo_size); | |
fd59d231 KO |
1525 | final_note(buf); |
1526 | } | |
1527 | ||
fa8ff292 MH |
1528 | void crash_save_vmcoreinfo(void) |
1529 | { | |
63dca8d5 | 1530 | vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds()); |
fa8ff292 MH |
1531 | update_vmcoreinfo_note(); |
1532 | } | |
1533 | ||
fd59d231 KO |
1534 | void vmcoreinfo_append_str(const char *fmt, ...) |
1535 | { | |
1536 | va_list args; | |
1537 | char buf[0x50]; | |
310faaa9 | 1538 | size_t r; |
fd59d231 KO |
1539 | |
1540 | va_start(args, fmt); | |
a19428e5 | 1541 | r = vscnprintf(buf, sizeof(buf), fmt, args); |
fd59d231 KO |
1542 | va_end(args); |
1543 | ||
31c3a3fe | 1544 | r = min(r, vmcoreinfo_max_size - vmcoreinfo_size); |
fd59d231 KO |
1545 | |
1546 | memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r); | |
1547 | ||
1548 | vmcoreinfo_size += r; | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * provide an empty default implementation here -- architecture | |
1553 | * code may override this | |
1554 | */ | |
52f5684c | 1555 | void __weak arch_crash_save_vmcoreinfo(void) |
fd59d231 KO |
1556 | {} |
1557 | ||
52f5684c | 1558 | unsigned long __weak paddr_vmcoreinfo_note(void) |
fd59d231 KO |
1559 | { |
1560 | return __pa((unsigned long)(char *)&vmcoreinfo_note); | |
1561 | } | |
1562 | ||
1563 | static int __init crash_save_vmcoreinfo_init(void) | |
1564 | { | |
bba1f603 KO |
1565 | VMCOREINFO_OSRELEASE(init_uts_ns.name.release); |
1566 | VMCOREINFO_PAGESIZE(PAGE_SIZE); | |
fd59d231 | 1567 | |
bcbba6c1 KO |
1568 | VMCOREINFO_SYMBOL(init_uts_ns); |
1569 | VMCOREINFO_SYMBOL(node_online_map); | |
d034cfab | 1570 | #ifdef CONFIG_MMU |
bcbba6c1 | 1571 | VMCOREINFO_SYMBOL(swapper_pg_dir); |
d034cfab | 1572 | #endif |
bcbba6c1 | 1573 | VMCOREINFO_SYMBOL(_stext); |
f1c4069e | 1574 | VMCOREINFO_SYMBOL(vmap_area_list); |
fd59d231 KO |
1575 | |
1576 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
bcbba6c1 KO |
1577 | VMCOREINFO_SYMBOL(mem_map); |
1578 | VMCOREINFO_SYMBOL(contig_page_data); | |
fd59d231 KO |
1579 | #endif |
1580 | #ifdef CONFIG_SPARSEMEM | |
bcbba6c1 KO |
1581 | VMCOREINFO_SYMBOL(mem_section); |
1582 | VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS); | |
c76f860c | 1583 | VMCOREINFO_STRUCT_SIZE(mem_section); |
bcbba6c1 | 1584 | VMCOREINFO_OFFSET(mem_section, section_mem_map); |
fd59d231 | 1585 | #endif |
c76f860c KO |
1586 | VMCOREINFO_STRUCT_SIZE(page); |
1587 | VMCOREINFO_STRUCT_SIZE(pglist_data); | |
1588 | VMCOREINFO_STRUCT_SIZE(zone); | |
1589 | VMCOREINFO_STRUCT_SIZE(free_area); | |
1590 | VMCOREINFO_STRUCT_SIZE(list_head); | |
1591 | VMCOREINFO_SIZE(nodemask_t); | |
bcbba6c1 KO |
1592 | VMCOREINFO_OFFSET(page, flags); |
1593 | VMCOREINFO_OFFSET(page, _count); | |
1594 | VMCOREINFO_OFFSET(page, mapping); | |
1595 | VMCOREINFO_OFFSET(page, lru); | |
8d67091e AK |
1596 | VMCOREINFO_OFFSET(page, _mapcount); |
1597 | VMCOREINFO_OFFSET(page, private); | |
bcbba6c1 KO |
1598 | VMCOREINFO_OFFSET(pglist_data, node_zones); |
1599 | VMCOREINFO_OFFSET(pglist_data, nr_zones); | |
fd59d231 | 1600 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
bcbba6c1 | 1601 | VMCOREINFO_OFFSET(pglist_data, node_mem_map); |
fd59d231 | 1602 | #endif |
bcbba6c1 KO |
1603 | VMCOREINFO_OFFSET(pglist_data, node_start_pfn); |
1604 | VMCOREINFO_OFFSET(pglist_data, node_spanned_pages); | |
1605 | VMCOREINFO_OFFSET(pglist_data, node_id); | |
1606 | VMCOREINFO_OFFSET(zone, free_area); | |
1607 | VMCOREINFO_OFFSET(zone, vm_stat); | |
1608 | VMCOREINFO_OFFSET(zone, spanned_pages); | |
1609 | VMCOREINFO_OFFSET(free_area, free_list); | |
1610 | VMCOREINFO_OFFSET(list_head, next); | |
1611 | VMCOREINFO_OFFSET(list_head, prev); | |
13ba3fcb AK |
1612 | VMCOREINFO_OFFSET(vmap_area, va_start); |
1613 | VMCOREINFO_OFFSET(vmap_area, list); | |
bcbba6c1 | 1614 | VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER); |
04d491ab | 1615 | log_buf_kexec_setup(); |
83a08e7c | 1616 | VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES); |
bcbba6c1 | 1617 | VMCOREINFO_NUMBER(NR_FREE_PAGES); |
122c7a59 KO |
1618 | VMCOREINFO_NUMBER(PG_lru); |
1619 | VMCOREINFO_NUMBER(PG_private); | |
1620 | VMCOREINFO_NUMBER(PG_swapcache); | |
8d67091e | 1621 | VMCOREINFO_NUMBER(PG_slab); |
0d0bf667 MT |
1622 | #ifdef CONFIG_MEMORY_FAILURE |
1623 | VMCOREINFO_NUMBER(PG_hwpoison); | |
1624 | #endif | |
8d67091e | 1625 | VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE); |
fd59d231 KO |
1626 | |
1627 | arch_crash_save_vmcoreinfo(); | |
fa8ff292 | 1628 | update_vmcoreinfo_note(); |
fd59d231 KO |
1629 | |
1630 | return 0; | |
1631 | } | |
1632 | ||
c96d6660 | 1633 | subsys_initcall(crash_save_vmcoreinfo_init); |
3ab83521 | 1634 | |
7ade3fcc HY |
1635 | /* |
1636 | * Move into place and start executing a preloaded standalone | |
1637 | * executable. If nothing was preloaded return an error. | |
3ab83521 HY |
1638 | */ |
1639 | int kernel_kexec(void) | |
1640 | { | |
1641 | int error = 0; | |
1642 | ||
8c5a1cf0 | 1643 | if (!mutex_trylock(&kexec_mutex)) |
3ab83521 HY |
1644 | return -EBUSY; |
1645 | if (!kexec_image) { | |
1646 | error = -EINVAL; | |
1647 | goto Unlock; | |
1648 | } | |
1649 | ||
3ab83521 | 1650 | #ifdef CONFIG_KEXEC_JUMP |
7ade3fcc | 1651 | if (kexec_image->preserve_context) { |
bcda53fa | 1652 | lock_system_sleep(); |
89081d17 HY |
1653 | pm_prepare_console(); |
1654 | error = freeze_processes(); | |
1655 | if (error) { | |
1656 | error = -EBUSY; | |
1657 | goto Restore_console; | |
1658 | } | |
1659 | suspend_console(); | |
d1616302 | 1660 | error = dpm_suspend_start(PMSG_FREEZE); |
89081d17 HY |
1661 | if (error) |
1662 | goto Resume_console; | |
d1616302 | 1663 | /* At this point, dpm_suspend_start() has been called, |
cf579dfb RW |
1664 | * but *not* dpm_suspend_end(). We *must* call |
1665 | * dpm_suspend_end() now. Otherwise, drivers for | |
89081d17 HY |
1666 | * some devices (e.g. interrupt controllers) become |
1667 | * desynchronized with the actual state of the | |
1668 | * hardware at resume time, and evil weirdness ensues. | |
1669 | */ | |
cf579dfb | 1670 | error = dpm_suspend_end(PMSG_FREEZE); |
89081d17 | 1671 | if (error) |
749b0afc RW |
1672 | goto Resume_devices; |
1673 | error = disable_nonboot_cpus(); | |
1674 | if (error) | |
1675 | goto Enable_cpus; | |
2ed8d2b3 | 1676 | local_irq_disable(); |
2e711c04 | 1677 | error = syscore_suspend(); |
770824bd | 1678 | if (error) |
749b0afc | 1679 | goto Enable_irqs; |
7ade3fcc | 1680 | } else |
3ab83521 | 1681 | #endif |
7ade3fcc | 1682 | { |
4fc9bbf9 | 1683 | kexec_in_progress = true; |
ca195b7f | 1684 | kernel_restart_prepare(NULL); |
c97102ba | 1685 | migrate_to_reboot_cpu(); |
011e4b02 SB |
1686 | |
1687 | /* | |
1688 | * migrate_to_reboot_cpu() disables CPU hotplug assuming that | |
1689 | * no further code needs to use CPU hotplug (which is true in | |
1690 | * the reboot case). However, the kexec path depends on using | |
1691 | * CPU hotplug again; so re-enable it here. | |
1692 | */ | |
1693 | cpu_hotplug_enable(); | |
3ab83521 HY |
1694 | printk(KERN_EMERG "Starting new kernel\n"); |
1695 | machine_shutdown(); | |
1696 | } | |
1697 | ||
1698 | machine_kexec(kexec_image); | |
1699 | ||
3ab83521 | 1700 | #ifdef CONFIG_KEXEC_JUMP |
7ade3fcc | 1701 | if (kexec_image->preserve_context) { |
19234c08 | 1702 | syscore_resume(); |
749b0afc | 1703 | Enable_irqs: |
3ab83521 | 1704 | local_irq_enable(); |
749b0afc | 1705 | Enable_cpus: |
89081d17 | 1706 | enable_nonboot_cpus(); |
cf579dfb | 1707 | dpm_resume_start(PMSG_RESTORE); |
89081d17 | 1708 | Resume_devices: |
d1616302 | 1709 | dpm_resume_end(PMSG_RESTORE); |
89081d17 HY |
1710 | Resume_console: |
1711 | resume_console(); | |
1712 | thaw_processes(); | |
1713 | Restore_console: | |
1714 | pm_restore_console(); | |
bcda53fa | 1715 | unlock_system_sleep(); |
3ab83521 | 1716 | } |
7ade3fcc | 1717 | #endif |
3ab83521 HY |
1718 | |
1719 | Unlock: | |
8c5a1cf0 | 1720 | mutex_unlock(&kexec_mutex); |
3ab83521 HY |
1721 | return error; |
1722 | } |