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Commit | Line | Data |
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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> |
8ff81271 | 21 | #include <asm/pgalloc.h> |
d9b2b2a2 | 22 | #include <asm/prom.h> |
2e8e4f5b | 23 | #include <asm/sections.h> |
3d1229d6 | 24 | |
c71635d2 MM |
25 | void machine_kexec_mask_interrupts(void) { |
26 | unsigned int i; | |
4013369f | 27 | struct irq_desc *desc; |
c71635d2 | 28 | |
4013369f | 29 | for_each_irq_desc(i, desc) { |
e1180287 | 30 | struct irq_chip *chip; |
c71635d2 | 31 | |
ec775d0e | 32 | chip = irq_desc_get_chip(desc); |
e1180287 LB |
33 | if (!chip) |
34 | continue; | |
35 | ||
98488db9 | 36 | if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) |
e1180287 | 37 | chip->irq_eoi(&desc->irq_data); |
c71635d2 | 38 | |
e1180287 LB |
39 | if (chip->irq_mask) |
40 | chip->irq_mask(&desc->irq_data); | |
c71635d2 | 41 | |
98488db9 | 42 | if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) |
e1180287 | 43 | chip->irq_disable(&desc->irq_data); |
c71635d2 MM |
44 | } |
45 | } | |
46 | ||
3d1229d6 ME |
47 | void machine_crash_shutdown(struct pt_regs *regs) |
48 | { | |
c1f784e5 | 49 | default_machine_crash_shutdown(regs); |
3d1229d6 ME |
50 | } |
51 | ||
52 | /* | |
53 | * Do what every setup is needed on image and the | |
54 | * reboot code buffer to allow us to avoid allocations | |
55 | * later. | |
56 | */ | |
57 | int machine_kexec_prepare(struct kimage *image) | |
58 | { | |
59 | if (ppc_md.machine_kexec_prepare) | |
60 | return ppc_md.machine_kexec_prepare(image); | |
77733f8a AV |
61 | else |
62 | return default_machine_kexec_prepare(image); | |
3d1229d6 ME |
63 | } |
64 | ||
65 | void machine_kexec_cleanup(struct kimage *image) | |
66 | { | |
3d1229d6 ME |
67 | } |
68 | ||
67238fb7 NH |
69 | void arch_crash_save_vmcoreinfo(void) |
70 | { | |
71 | ||
72 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
73 | VMCOREINFO_SYMBOL(node_data); | |
74 | VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); | |
75 | #endif | |
76 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
77 | VMCOREINFO_SYMBOL(contig_page_data); | |
78 | #endif | |
8ff81271 HB |
79 | #if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP) |
80 | VMCOREINFO_SYMBOL(vmemmap_list); | |
81 | VMCOREINFO_SYMBOL(mmu_vmemmap_psize); | |
82 | VMCOREINFO_SYMBOL(mmu_psize_defs); | |
83 | VMCOREINFO_STRUCT_SIZE(vmemmap_backing); | |
84 | VMCOREINFO_OFFSET(vmemmap_backing, list); | |
85 | VMCOREINFO_OFFSET(vmemmap_backing, phys); | |
86 | VMCOREINFO_OFFSET(vmemmap_backing, virt_addr); | |
87 | VMCOREINFO_STRUCT_SIZE(mmu_psize_def); | |
88 | VMCOREINFO_OFFSET(mmu_psize_def, shift); | |
89 | #endif | |
67238fb7 NH |
90 | } |
91 | ||
3d1229d6 ME |
92 | /* |
93 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
94 | * We are past the point of no return, committed to rebooting now. | |
95 | */ | |
3ab83521 | 96 | void machine_kexec(struct kimage *image) |
3d1229d6 | 97 | { |
ac4414e4 AB |
98 | int save_ftrace_enabled; |
99 | ||
100 | save_ftrace_enabled = __ftrace_enabled_save(); | |
101 | ||
357574c4 AB |
102 | if (ppc_md.machine_kexec) |
103 | ppc_md.machine_kexec(image); | |
104 | else | |
105 | default_machine_kexec(image); | |
77733f8a | 106 | |
ac4414e4 AB |
107 | __ftrace_enabled_restore(save_ftrace_enabled); |
108 | ||
77733f8a AV |
109 | /* Fall back to normal restart if we're still alive. */ |
110 | machine_restart(NULL); | |
3d1229d6 ME |
111 | for(;;); |
112 | } | |
47585d8f | 113 | |
47585d8f ME |
114 | void __init reserve_crashkernel(void) |
115 | { | |
edd8ce67 BW |
116 | unsigned long long crash_size, crash_base; |
117 | int ret; | |
118 | ||
edd8ce67 | 119 | /* use common parsing */ |
95f72d1e | 120 | ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), |
edd8ce67 BW |
121 | &crash_size, &crash_base); |
122 | if (ret == 0 && crash_size > 0) { | |
edd8ce67 | 123 | crashk_res.start = crash_base; |
eabd9094 | 124 | crashk_res.end = crash_base + crash_size - 1; |
edd8ce67 | 125 | } |
47585d8f | 126 | |
eabd9094 ME |
127 | if (crashk_res.end == crashk_res.start) { |
128 | crashk_res.start = crashk_res.end = 0; | |
47585d8f | 129 | return; |
eabd9094 | 130 | } |
47585d8f ME |
131 | |
132 | /* We might have got these values via the command line or the | |
133 | * device tree, either way sanitise them now. */ | |
134 | ||
28f65c11 | 135 | crash_size = resource_size(&crashk_res); |
eabd9094 | 136 | |
0f890c8d | 137 | #ifndef CONFIG_NONSTATIC_KERNEL |
47585d8f ME |
138 | if (crashk_res.start != KDUMP_KERNELBASE) |
139 | printk("Crash kernel location must be 0x%x\n", | |
140 | KDUMP_KERNELBASE); | |
141 | ||
142 | crashk_res.start = KDUMP_KERNELBASE; | |
66c721e1 MM |
143 | #else |
144 | if (!crashk_res.start) { | |
8aa6d359 | 145 | #ifdef CONFIG_PPC64 |
66c721e1 | 146 | /* |
8aa6d359 AB |
147 | * On 64bit we split the RMO in half but cap it at half of |
148 | * a small SLB (128MB) since the crash kernel needs to place | |
149 | * itself and some stacks to be in the first segment. | |
66c721e1 | 150 | */ |
e641eb03 | 151 | crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2)); |
8aa6d359 | 152 | #else |
66c721e1 | 153 | crashk_res.start = KDUMP_KERNELBASE; |
8aa6d359 | 154 | #endif |
66c721e1 MM |
155 | } |
156 | ||
157 | crash_base = PAGE_ALIGN(crashk_res.start); | |
158 | if (crash_base != crashk_res.start) { | |
159 | printk("Crash kernel base must be aligned to 0x%lx\n", | |
160 | PAGE_SIZE); | |
161 | crashk_res.start = crash_base; | |
162 | } | |
163 | ||
54622f10 | 164 | #endif |
edd8ce67 BW |
165 | crash_size = PAGE_ALIGN(crash_size); |
166 | crashk_res.end = crashk_res.start + crash_size - 1; | |
47585d8f | 167 | |
66c721e1 MM |
168 | /* The crash region must not overlap the current kernel */ |
169 | if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { | |
170 | printk(KERN_WARNING | |
171 | "Crash kernel can not overlap current kernel\n"); | |
172 | crashk_res.start = crashk_res.end = 0; | |
173 | return; | |
174 | } | |
175 | ||
47585d8f ME |
176 | /* Crash kernel trumps memory limit */ |
177 | if (memory_limit && memory_limit <= crashk_res.end) { | |
178 | memory_limit = crashk_res.end + 1; | |
49a84965 | 179 | printk("Adjusted memory limit for crashkernel, now 0x%llx\n", |
a84fcd46 | 180 | memory_limit); |
47585d8f ME |
181 | } |
182 | ||
edd8ce67 BW |
183 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
184 | "for crashkernel (System RAM: %ldMB)\n", | |
185 | (unsigned long)(crash_size >> 20), | |
186 | (unsigned long)(crashk_res.start >> 20), | |
95f72d1e | 187 | (unsigned long)(memblock_phys_mem_size() >> 20)); |
edd8ce67 | 188 | |
95f72d1e | 189 | memblock_reserve(crashk_res.start, crash_size); |
47585d8f ME |
190 | } |
191 | ||
192 | int overlaps_crashkernel(unsigned long start, unsigned long size) | |
193 | { | |
194 | return (start + size) > crashk_res.start && start <= crashk_res.end; | |
195 | } | |
2e8e4f5b DF |
196 | |
197 | /* Values we need to export to the second kernel via the device tree. */ | |
bbc8e30f | 198 | static phys_addr_t kernel_end; |
ea961a82 | 199 | static phys_addr_t crashk_base; |
bbc8e30f | 200 | static phys_addr_t crashk_size; |
ea961a82 | 201 | static unsigned long long mem_limit; |
2e8e4f5b DF |
202 | |
203 | static struct property kernel_end_prop = { | |
204 | .name = "linux,kernel-end", | |
bbc8e30f | 205 | .length = sizeof(phys_addr_t), |
2e8e4f5b DF |
206 | .value = &kernel_end, |
207 | }; | |
208 | ||
6f29c329 DF |
209 | static struct property crashk_base_prop = { |
210 | .name = "linux,crashkernel-base", | |
bbc8e30f | 211 | .length = sizeof(phys_addr_t), |
ea961a82 | 212 | .value = &crashk_base |
6f29c329 DF |
213 | }; |
214 | ||
215 | static struct property crashk_size_prop = { | |
216 | .name = "linux,crashkernel-size", | |
bbc8e30f | 217 | .length = sizeof(phys_addr_t), |
6f29c329 DF |
218 | .value = &crashk_size, |
219 | }; | |
220 | ||
4bc77a5e SP |
221 | static struct property memory_limit_prop = { |
222 | .name = "linux,memory-limit", | |
223 | .length = sizeof(unsigned long long), | |
ea961a82 | 224 | .value = &mem_limit, |
4bc77a5e SP |
225 | }; |
226 | ||
ea961a82 AB |
227 | #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG) |
228 | ||
6f29c329 DF |
229 | static void __init export_crashk_values(struct device_node *node) |
230 | { | |
231 | struct property *prop; | |
232 | ||
233 | /* There might be existing crash kernel properties, but we can't | |
234 | * be sure what's in them, so remove them. */ | |
235 | prop = of_find_property(node, "linux,crashkernel-base", NULL); | |
236 | if (prop) | |
79d1c712 | 237 | of_remove_property(node, prop); |
6f29c329 DF |
238 | |
239 | prop = of_find_property(node, "linux,crashkernel-size", NULL); | |
240 | if (prop) | |
79d1c712 | 241 | of_remove_property(node, prop); |
6f29c329 DF |
242 | |
243 | if (crashk_res.start != 0) { | |
ea961a82 | 244 | crashk_base = cpu_to_be_ulong(crashk_res.start), |
79d1c712 | 245 | of_add_property(node, &crashk_base_prop); |
ea961a82 | 246 | crashk_size = cpu_to_be_ulong(resource_size(&crashk_res)); |
79d1c712 | 247 | of_add_property(node, &crashk_size_prop); |
6f29c329 | 248 | } |
4bc77a5e SP |
249 | |
250 | /* | |
251 | * memory_limit is required by the kexec-tools to limit the | |
252 | * crash regions to the actual memory used. | |
253 | */ | |
ea961a82 | 254 | mem_limit = cpu_to_be_ulong(memory_limit); |
79d1c712 | 255 | of_update_property(node, &memory_limit_prop); |
6f29c329 DF |
256 | } |
257 | ||
2e8e4f5b DF |
258 | static int __init kexec_setup(void) |
259 | { | |
260 | struct device_node *node; | |
261 | struct property *prop; | |
262 | ||
263 | node = of_find_node_by_path("/chosen"); | |
264 | if (!node) | |
265 | return -ENOENT; | |
266 | ||
267 | /* remove any stale properties so ours can be found */ | |
268 | prop = of_find_property(node, kernel_end_prop.name, NULL); | |
269 | if (prop) | |
79d1c712 | 270 | of_remove_property(node, prop); |
2e8e4f5b DF |
271 | |
272 | /* information needed by userspace when using default_machine_kexec */ | |
ea961a82 | 273 | kernel_end = cpu_to_be_ulong(__pa(_end)); |
79d1c712 | 274 | of_add_property(node, &kernel_end_prop); |
2e8e4f5b | 275 | |
6f29c329 DF |
276 | export_crashk_values(node); |
277 | ||
2e8e4f5b DF |
278 | of_node_put(node); |
279 | return 0; | |
280 | } | |
281 | late_initcall(kexec_setup); |