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 | 17 | #include <linux/irq.h> |
ac4414e4 | 18 | #include <linux/ftrace.h> |
c71635d2 | 19 | |
3d1229d6 | 20 | #include <asm/machdep.h> |
d9b2b2a2 | 21 | #include <asm/prom.h> |
2e8e4f5b | 22 | #include <asm/sections.h> |
3d1229d6 | 23 | |
c71635d2 MM |
24 | void machine_kexec_mask_interrupts(void) { |
25 | unsigned int i; | |
26 | ||
27 | for_each_irq(i) { | |
28 | struct irq_desc *desc = irq_to_desc(i); | |
e1180287 | 29 | struct irq_chip *chip; |
c71635d2 | 30 | |
e1180287 | 31 | if (!desc) |
c71635d2 MM |
32 | continue; |
33 | ||
e1180287 LB |
34 | chip = get_irq_desc_chip(desc); |
35 | if (!chip) | |
36 | continue; | |
37 | ||
38 | if (chip->irq_eoi && desc->status & IRQ_INPROGRESS) | |
39 | chip->irq_eoi(&desc->irq_data); | |
c71635d2 | 40 | |
e1180287 LB |
41 | if (chip->irq_mask) |
42 | chip->irq_mask(&desc->irq_data); | |
c71635d2 | 43 | |
e1180287 LB |
44 | if (chip->irq_disable && !(desc->status & IRQ_DISABLED)) |
45 | chip->irq_disable(&desc->irq_data); | |
c71635d2 MM |
46 | } |
47 | } | |
48 | ||
3d1229d6 ME |
49 | void machine_crash_shutdown(struct pt_regs *regs) |
50 | { | |
c1f784e5 | 51 | default_machine_crash_shutdown(regs); |
3d1229d6 ME |
52 | } |
53 | ||
54 | /* | |
55 | * Do what every setup is needed on image and the | |
56 | * reboot code buffer to allow us to avoid allocations | |
57 | * later. | |
58 | */ | |
59 | int machine_kexec_prepare(struct kimage *image) | |
60 | { | |
61 | if (ppc_md.machine_kexec_prepare) | |
62 | return ppc_md.machine_kexec_prepare(image); | |
77733f8a AV |
63 | else |
64 | return default_machine_kexec_prepare(image); | |
3d1229d6 ME |
65 | } |
66 | ||
67 | void machine_kexec_cleanup(struct kimage *image) | |
68 | { | |
3d1229d6 ME |
69 | } |
70 | ||
67238fb7 NH |
71 | void arch_crash_save_vmcoreinfo(void) |
72 | { | |
73 | ||
74 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
75 | VMCOREINFO_SYMBOL(node_data); | |
76 | VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); | |
77 | #endif | |
78 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
79 | VMCOREINFO_SYMBOL(contig_page_data); | |
80 | #endif | |
81 | } | |
82 | ||
3d1229d6 ME |
83 | /* |
84 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
85 | * We are past the point of no return, committed to rebooting now. | |
86 | */ | |
3ab83521 | 87 | void machine_kexec(struct kimage *image) |
3d1229d6 | 88 | { |
ac4414e4 AB |
89 | int save_ftrace_enabled; |
90 | ||
91 | save_ftrace_enabled = __ftrace_enabled_save(); | |
92 | ||
357574c4 AB |
93 | if (ppc_md.machine_kexec) |
94 | ppc_md.machine_kexec(image); | |
95 | else | |
96 | default_machine_kexec(image); | |
77733f8a | 97 | |
ac4414e4 AB |
98 | __ftrace_enabled_restore(save_ftrace_enabled); |
99 | ||
77733f8a AV |
100 | /* Fall back to normal restart if we're still alive. */ |
101 | machine_restart(NULL); | |
3d1229d6 ME |
102 | for(;;); |
103 | } | |
47585d8f | 104 | |
47585d8f ME |
105 | void __init reserve_crashkernel(void) |
106 | { | |
edd8ce67 BW |
107 | unsigned long long crash_size, crash_base; |
108 | int ret; | |
109 | ||
95f72d1e YL |
110 | /* this is necessary because of memblock_phys_mem_size() */ |
111 | memblock_analyze(); | |
edd8ce67 BW |
112 | |
113 | /* use common parsing */ | |
95f72d1e | 114 | ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), |
edd8ce67 BW |
115 | &crash_size, &crash_base); |
116 | if (ret == 0 && crash_size > 0) { | |
edd8ce67 | 117 | crashk_res.start = crash_base; |
eabd9094 | 118 | crashk_res.end = crash_base + crash_size - 1; |
edd8ce67 | 119 | } |
47585d8f | 120 | |
eabd9094 ME |
121 | if (crashk_res.end == crashk_res.start) { |
122 | crashk_res.start = crashk_res.end = 0; | |
47585d8f | 123 | return; |
eabd9094 | 124 | } |
47585d8f ME |
125 | |
126 | /* We might have got these values via the command line or the | |
127 | * device tree, either way sanitise them now. */ | |
128 | ||
eabd9094 ME |
129 | crash_size = crashk_res.end - crashk_res.start + 1; |
130 | ||
54622f10 | 131 | #ifndef CONFIG_RELOCATABLE |
47585d8f ME |
132 | if (crashk_res.start != KDUMP_KERNELBASE) |
133 | printk("Crash kernel location must be 0x%x\n", | |
134 | KDUMP_KERNELBASE); | |
135 | ||
136 | crashk_res.start = KDUMP_KERNELBASE; | |
66c721e1 MM |
137 | #else |
138 | if (!crashk_res.start) { | |
139 | /* | |
140 | * unspecified address, choose a region of specified size | |
141 | * can overlap with initrd (ignoring corruption when retained) | |
142 | * ppc64 requires kernel and some stacks to be in first segemnt | |
143 | */ | |
144 | crashk_res.start = KDUMP_KERNELBASE; | |
145 | } | |
146 | ||
147 | crash_base = PAGE_ALIGN(crashk_res.start); | |
148 | if (crash_base != crashk_res.start) { | |
149 | printk("Crash kernel base must be aligned to 0x%lx\n", | |
150 | PAGE_SIZE); | |
151 | crashk_res.start = crash_base; | |
152 | } | |
153 | ||
54622f10 | 154 | #endif |
edd8ce67 BW |
155 | crash_size = PAGE_ALIGN(crash_size); |
156 | crashk_res.end = crashk_res.start + crash_size - 1; | |
47585d8f | 157 | |
66c721e1 MM |
158 | /* The crash region must not overlap the current kernel */ |
159 | if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { | |
160 | printk(KERN_WARNING | |
161 | "Crash kernel can not overlap current kernel\n"); | |
162 | crashk_res.start = crashk_res.end = 0; | |
163 | return; | |
164 | } | |
165 | ||
47585d8f ME |
166 | /* Crash kernel trumps memory limit */ |
167 | if (memory_limit && memory_limit <= crashk_res.end) { | |
168 | memory_limit = crashk_res.end + 1; | |
49a84965 BB |
169 | printk("Adjusted memory limit for crashkernel, now 0x%llx\n", |
170 | (unsigned long long)memory_limit); | |
47585d8f ME |
171 | } |
172 | ||
edd8ce67 BW |
173 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
174 | "for crashkernel (System RAM: %ldMB)\n", | |
175 | (unsigned long)(crash_size >> 20), | |
176 | (unsigned long)(crashk_res.start >> 20), | |
95f72d1e | 177 | (unsigned long)(memblock_phys_mem_size() >> 20)); |
edd8ce67 | 178 | |
95f72d1e | 179 | memblock_reserve(crashk_res.start, crash_size); |
47585d8f ME |
180 | } |
181 | ||
182 | int overlaps_crashkernel(unsigned long start, unsigned long size) | |
183 | { | |
184 | return (start + size) > crashk_res.start && start <= crashk_res.end; | |
185 | } | |
2e8e4f5b DF |
186 | |
187 | /* Values we need to export to the second kernel via the device tree. */ | |
bbc8e30f MM |
188 | static phys_addr_t kernel_end; |
189 | static phys_addr_t crashk_size; | |
2e8e4f5b DF |
190 | |
191 | static struct property kernel_end_prop = { | |
192 | .name = "linux,kernel-end", | |
bbc8e30f | 193 | .length = sizeof(phys_addr_t), |
2e8e4f5b DF |
194 | .value = &kernel_end, |
195 | }; | |
196 | ||
6f29c329 DF |
197 | static struct property crashk_base_prop = { |
198 | .name = "linux,crashkernel-base", | |
bbc8e30f | 199 | .length = sizeof(phys_addr_t), |
6f29c329 DF |
200 | .value = &crashk_res.start, |
201 | }; | |
202 | ||
203 | static struct property crashk_size_prop = { | |
204 | .name = "linux,crashkernel-size", | |
bbc8e30f | 205 | .length = sizeof(phys_addr_t), |
6f29c329 DF |
206 | .value = &crashk_size, |
207 | }; | |
208 | ||
209 | static void __init export_crashk_values(struct device_node *node) | |
210 | { | |
211 | struct property *prop; | |
212 | ||
213 | /* There might be existing crash kernel properties, but we can't | |
214 | * be sure what's in them, so remove them. */ | |
215 | prop = of_find_property(node, "linux,crashkernel-base", NULL); | |
216 | if (prop) | |
217 | prom_remove_property(node, prop); | |
218 | ||
219 | prop = of_find_property(node, "linux,crashkernel-size", NULL); | |
220 | if (prop) | |
221 | prom_remove_property(node, prop); | |
222 | ||
223 | if (crashk_res.start != 0) { | |
224 | prom_add_property(node, &crashk_base_prop); | |
225 | crashk_size = crashk_res.end - crashk_res.start + 1; | |
226 | prom_add_property(node, &crashk_size_prop); | |
227 | } | |
228 | } | |
229 | ||
2e8e4f5b DF |
230 | static int __init kexec_setup(void) |
231 | { | |
232 | struct device_node *node; | |
233 | struct property *prop; | |
234 | ||
235 | node = of_find_node_by_path("/chosen"); | |
236 | if (!node) | |
237 | return -ENOENT; | |
238 | ||
239 | /* remove any stale properties so ours can be found */ | |
240 | prop = of_find_property(node, kernel_end_prop.name, NULL); | |
241 | if (prop) | |
242 | prom_remove_property(node, prop); | |
243 | ||
244 | /* information needed by userspace when using default_machine_kexec */ | |
245 | kernel_end = __pa(_end); | |
246 | prom_add_property(node, &kernel_end_prop); | |
247 | ||
6f29c329 DF |
248 | export_crashk_values(node); |
249 | ||
2e8e4f5b DF |
250 | of_node_put(node); |
251 | return 0; | |
252 | } | |
253 | late_initcall(kexec_setup); |