]>
Commit | Line | Data |
---|---|---|
3d1229d6 ME |
1 | /* |
2 | * Code to handle transition of Linux booting another kernel. | |
3 | * | |
4 | * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> | |
5 | * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz | |
6 | * Copyright (C) 2005 IBM Corporation. | |
7 | * | |
8 | * This source code is licensed under the GNU General Public License, | |
9 | * Version 2. See the file COPYING for more details. | |
10 | */ | |
11 | ||
12 | #include <linux/kexec.h> | |
13 | #include <linux/reboot.h> | |
14 | #include <linux/threads.h> | |
95f72d1e | 15 | #include <linux/memblock.h> |
2e8e4f5b | 16 | #include <linux/of.h> |
c71635d2 MM |
17 | #include <linux/irq.h> |
18 | ||
3d1229d6 | 19 | #include <asm/machdep.h> |
d9b2b2a2 | 20 | #include <asm/prom.h> |
2e8e4f5b | 21 | #include <asm/sections.h> |
3d1229d6 | 22 | |
c71635d2 MM |
23 | void machine_kexec_mask_interrupts(void) { |
24 | unsigned int i; | |
25 | ||
26 | for_each_irq(i) { | |
27 | struct irq_desc *desc = irq_to_desc(i); | |
28 | ||
29 | if (!desc || !desc->chip) | |
30 | continue; | |
31 | ||
32 | if (desc->chip->eoi && | |
33 | desc->status & IRQ_INPROGRESS) | |
34 | desc->chip->eoi(i); | |
35 | ||
36 | if (desc->chip->mask) | |
37 | desc->chip->mask(i); | |
38 | ||
39 | if (desc->chip->disable && | |
40 | !(desc->status & IRQ_DISABLED)) | |
41 | desc->chip->disable(i); | |
42 | } | |
43 | } | |
44 | ||
3d1229d6 ME |
45 | void machine_crash_shutdown(struct pt_regs *regs) |
46 | { | |
47 | if (ppc_md.machine_crash_shutdown) | |
cd0ca2ce | 48 | ppc_md.machine_crash_shutdown(regs); |
77733f8a AV |
49 | else |
50 | default_machine_crash_shutdown(regs); | |
3d1229d6 ME |
51 | } |
52 | ||
53 | /* | |
54 | * Do what every setup is needed on image and the | |
55 | * reboot code buffer to allow us to avoid allocations | |
56 | * later. | |
57 | */ | |
58 | int machine_kexec_prepare(struct kimage *image) | |
59 | { | |
60 | if (ppc_md.machine_kexec_prepare) | |
61 | return ppc_md.machine_kexec_prepare(image); | |
77733f8a AV |
62 | else |
63 | return default_machine_kexec_prepare(image); | |
3d1229d6 ME |
64 | } |
65 | ||
66 | void machine_kexec_cleanup(struct kimage *image) | |
67 | { | |
68 | if (ppc_md.machine_kexec_cleanup) | |
69 | ppc_md.machine_kexec_cleanup(image); | |
70 | } | |
71 | ||
67238fb7 NH |
72 | void arch_crash_save_vmcoreinfo(void) |
73 | { | |
74 | ||
75 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
76 | VMCOREINFO_SYMBOL(node_data); | |
77 | VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); | |
78 | #endif | |
79 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
80 | VMCOREINFO_SYMBOL(contig_page_data); | |
81 | #endif | |
82 | } | |
83 | ||
3d1229d6 ME |
84 | /* |
85 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
86 | * We are past the point of no return, committed to rebooting now. | |
87 | */ | |
3ab83521 | 88 | void machine_kexec(struct kimage *image) |
3d1229d6 ME |
89 | { |
90 | if (ppc_md.machine_kexec) | |
91 | ppc_md.machine_kexec(image); | |
77733f8a AV |
92 | else |
93 | default_machine_kexec(image); | |
94 | ||
95 | /* Fall back to normal restart if we're still alive. */ | |
96 | machine_restart(NULL); | |
3d1229d6 ME |
97 | for(;;); |
98 | } | |
47585d8f | 99 | |
47585d8f ME |
100 | void __init reserve_crashkernel(void) |
101 | { | |
edd8ce67 BW |
102 | unsigned long long crash_size, crash_base; |
103 | int ret; | |
104 | ||
95f72d1e YL |
105 | /* this is necessary because of memblock_phys_mem_size() */ |
106 | memblock_analyze(); | |
edd8ce67 BW |
107 | |
108 | /* use common parsing */ | |
95f72d1e | 109 | ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), |
edd8ce67 BW |
110 | &crash_size, &crash_base); |
111 | if (ret == 0 && crash_size > 0) { | |
edd8ce67 | 112 | crashk_res.start = crash_base; |
eabd9094 | 113 | crashk_res.end = crash_base + crash_size - 1; |
edd8ce67 | 114 | } |
47585d8f | 115 | |
eabd9094 ME |
116 | if (crashk_res.end == crashk_res.start) { |
117 | crashk_res.start = crashk_res.end = 0; | |
47585d8f | 118 | return; |
eabd9094 | 119 | } |
47585d8f ME |
120 | |
121 | /* We might have got these values via the command line or the | |
122 | * device tree, either way sanitise them now. */ | |
123 | ||
eabd9094 ME |
124 | crash_size = crashk_res.end - crashk_res.start + 1; |
125 | ||
54622f10 | 126 | #ifndef CONFIG_RELOCATABLE |
47585d8f ME |
127 | if (crashk_res.start != KDUMP_KERNELBASE) |
128 | printk("Crash kernel location must be 0x%x\n", | |
129 | KDUMP_KERNELBASE); | |
130 | ||
131 | crashk_res.start = KDUMP_KERNELBASE; | |
66c721e1 MM |
132 | #else |
133 | if (!crashk_res.start) { | |
134 | /* | |
135 | * unspecified address, choose a region of specified size | |
136 | * can overlap with initrd (ignoring corruption when retained) | |
137 | * ppc64 requires kernel and some stacks to be in first segemnt | |
138 | */ | |
139 | crashk_res.start = KDUMP_KERNELBASE; | |
140 | } | |
141 | ||
142 | crash_base = PAGE_ALIGN(crashk_res.start); | |
143 | if (crash_base != crashk_res.start) { | |
144 | printk("Crash kernel base must be aligned to 0x%lx\n", | |
145 | PAGE_SIZE); | |
146 | crashk_res.start = crash_base; | |
147 | } | |
148 | ||
54622f10 | 149 | #endif |
edd8ce67 BW |
150 | crash_size = PAGE_ALIGN(crash_size); |
151 | crashk_res.end = crashk_res.start + crash_size - 1; | |
47585d8f | 152 | |
66c721e1 MM |
153 | /* The crash region must not overlap the current kernel */ |
154 | if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { | |
155 | printk(KERN_WARNING | |
156 | "Crash kernel can not overlap current kernel\n"); | |
157 | crashk_res.start = crashk_res.end = 0; | |
158 | return; | |
159 | } | |
160 | ||
47585d8f ME |
161 | /* Crash kernel trumps memory limit */ |
162 | if (memory_limit && memory_limit <= crashk_res.end) { | |
163 | memory_limit = crashk_res.end + 1; | |
49a84965 BB |
164 | printk("Adjusted memory limit for crashkernel, now 0x%llx\n", |
165 | (unsigned long long)memory_limit); | |
47585d8f ME |
166 | } |
167 | ||
edd8ce67 BW |
168 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
169 | "for crashkernel (System RAM: %ldMB)\n", | |
170 | (unsigned long)(crash_size >> 20), | |
171 | (unsigned long)(crashk_res.start >> 20), | |
95f72d1e | 172 | (unsigned long)(memblock_phys_mem_size() >> 20)); |
edd8ce67 | 173 | |
95f72d1e | 174 | memblock_reserve(crashk_res.start, crash_size); |
47585d8f ME |
175 | } |
176 | ||
177 | int overlaps_crashkernel(unsigned long start, unsigned long size) | |
178 | { | |
179 | return (start + size) > crashk_res.start && start <= crashk_res.end; | |
180 | } | |
2e8e4f5b DF |
181 | |
182 | /* Values we need to export to the second kernel via the device tree. */ | |
bbc8e30f MM |
183 | static phys_addr_t kernel_end; |
184 | static phys_addr_t crashk_size; | |
2e8e4f5b DF |
185 | |
186 | static struct property kernel_end_prop = { | |
187 | .name = "linux,kernel-end", | |
bbc8e30f | 188 | .length = sizeof(phys_addr_t), |
2e8e4f5b DF |
189 | .value = &kernel_end, |
190 | }; | |
191 | ||
6f29c329 DF |
192 | static struct property crashk_base_prop = { |
193 | .name = "linux,crashkernel-base", | |
bbc8e30f | 194 | .length = sizeof(phys_addr_t), |
6f29c329 DF |
195 | .value = &crashk_res.start, |
196 | }; | |
197 | ||
198 | static struct property crashk_size_prop = { | |
199 | .name = "linux,crashkernel-size", | |
bbc8e30f | 200 | .length = sizeof(phys_addr_t), |
6f29c329 DF |
201 | .value = &crashk_size, |
202 | }; | |
203 | ||
204 | static void __init export_crashk_values(struct device_node *node) | |
205 | { | |
206 | struct property *prop; | |
207 | ||
208 | /* There might be existing crash kernel properties, but we can't | |
209 | * be sure what's in them, so remove them. */ | |
210 | prop = of_find_property(node, "linux,crashkernel-base", NULL); | |
211 | if (prop) | |
212 | prom_remove_property(node, prop); | |
213 | ||
214 | prop = of_find_property(node, "linux,crashkernel-size", NULL); | |
215 | if (prop) | |
216 | prom_remove_property(node, prop); | |
217 | ||
218 | if (crashk_res.start != 0) { | |
219 | prom_add_property(node, &crashk_base_prop); | |
220 | crashk_size = crashk_res.end - crashk_res.start + 1; | |
221 | prom_add_property(node, &crashk_size_prop); | |
222 | } | |
223 | } | |
224 | ||
2e8e4f5b DF |
225 | static int __init kexec_setup(void) |
226 | { | |
227 | struct device_node *node; | |
228 | struct property *prop; | |
229 | ||
230 | node = of_find_node_by_path("/chosen"); | |
231 | if (!node) | |
232 | return -ENOENT; | |
233 | ||
234 | /* remove any stale properties so ours can be found */ | |
235 | prop = of_find_property(node, kernel_end_prop.name, NULL); | |
236 | if (prop) | |
237 | prom_remove_property(node, prop); | |
238 | ||
239 | /* information needed by userspace when using default_machine_kexec */ | |
240 | kernel_end = __pa(_end); | |
241 | prom_add_property(node, &kernel_end_prop); | |
242 | ||
6f29c329 DF |
243 | export_crashk_values(node); |
244 | ||
2e8e4f5b DF |
245 | of_node_put(node); |
246 | return 0; | |
247 | } | |
248 | late_initcall(kexec_setup); |