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 | |
db0a2b63 | 20 | #include <asm/kdump.h> |
3d1229d6 | 21 | #include <asm/machdep.h> |
8ff81271 | 22 | #include <asm/pgalloc.h> |
d9b2b2a2 | 23 | #include <asm/prom.h> |
2e8e4f5b | 24 | #include <asm/sections.h> |
3d1229d6 | 25 | |
c71635d2 MM |
26 | void machine_kexec_mask_interrupts(void) { |
27 | unsigned int i; | |
4013369f | 28 | struct irq_desc *desc; |
c71635d2 | 29 | |
4013369f | 30 | for_each_irq_desc(i, desc) { |
e1180287 | 31 | struct irq_chip *chip; |
c71635d2 | 32 | |
ec775d0e | 33 | chip = irq_desc_get_chip(desc); |
e1180287 LB |
34 | if (!chip) |
35 | continue; | |
36 | ||
98488db9 | 37 | if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) |
e1180287 | 38 | chip->irq_eoi(&desc->irq_data); |
c71635d2 | 39 | |
e1180287 LB |
40 | if (chip->irq_mask) |
41 | chip->irq_mask(&desc->irq_data); | |
c71635d2 | 42 | |
98488db9 | 43 | if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) |
e1180287 | 44 | chip->irq_disable(&desc->irq_data); |
c71635d2 MM |
45 | } |
46 | } | |
47 | ||
3d1229d6 ME |
48 | void machine_crash_shutdown(struct pt_regs *regs) |
49 | { | |
c1f784e5 | 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 | { | |
3d1229d6 ME |
68 | } |
69 | ||
67238fb7 NH |
70 | void arch_crash_save_vmcoreinfo(void) |
71 | { | |
72 | ||
73 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
74 | VMCOREINFO_SYMBOL(node_data); | |
75 | VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); | |
76 | #endif | |
77 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
78 | VMCOREINFO_SYMBOL(contig_page_data); | |
79 | #endif | |
8ff81271 HB |
80 | #if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP) |
81 | VMCOREINFO_SYMBOL(vmemmap_list); | |
82 | VMCOREINFO_SYMBOL(mmu_vmemmap_psize); | |
83 | VMCOREINFO_SYMBOL(mmu_psize_defs); | |
84 | VMCOREINFO_STRUCT_SIZE(vmemmap_backing); | |
85 | VMCOREINFO_OFFSET(vmemmap_backing, list); | |
86 | VMCOREINFO_OFFSET(vmemmap_backing, phys); | |
87 | VMCOREINFO_OFFSET(vmemmap_backing, virt_addr); | |
88 | VMCOREINFO_STRUCT_SIZE(mmu_psize_def); | |
89 | VMCOREINFO_OFFSET(mmu_psize_def, shift); | |
90 | #endif | |
67238fb7 NH |
91 | } |
92 | ||
3d1229d6 ME |
93 | /* |
94 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
95 | * We are past the point of no return, committed to rebooting now. | |
96 | */ | |
3ab83521 | 97 | void machine_kexec(struct kimage *image) |
3d1229d6 | 98 | { |
ac4414e4 AB |
99 | int save_ftrace_enabled; |
100 | ||
101 | save_ftrace_enabled = __ftrace_enabled_save(); | |
88b1a854 | 102 | this_cpu_disable_ftrace(); |
ac4414e4 | 103 | |
357574c4 AB |
104 | if (ppc_md.machine_kexec) |
105 | ppc_md.machine_kexec(image); | |
106 | else | |
107 | default_machine_kexec(image); | |
77733f8a | 108 | |
88b1a854 | 109 | this_cpu_enable_ftrace(); |
ac4414e4 AB |
110 | __ftrace_enabled_restore(save_ftrace_enabled); |
111 | ||
77733f8a AV |
112 | /* Fall back to normal restart if we're still alive. */ |
113 | machine_restart(NULL); | |
3d1229d6 ME |
114 | for(;;); |
115 | } | |
47585d8f | 116 | |
47585d8f ME |
117 | void __init reserve_crashkernel(void) |
118 | { | |
edd8ce67 BW |
119 | unsigned long long crash_size, crash_base; |
120 | int ret; | |
121 | ||
edd8ce67 | 122 | /* use common parsing */ |
95f72d1e | 123 | ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), |
edd8ce67 BW |
124 | &crash_size, &crash_base); |
125 | if (ret == 0 && crash_size > 0) { | |
edd8ce67 | 126 | crashk_res.start = crash_base; |
eabd9094 | 127 | crashk_res.end = crash_base + crash_size - 1; |
edd8ce67 | 128 | } |
47585d8f | 129 | |
eabd9094 ME |
130 | if (crashk_res.end == crashk_res.start) { |
131 | crashk_res.start = crashk_res.end = 0; | |
47585d8f | 132 | return; |
eabd9094 | 133 | } |
47585d8f ME |
134 | |
135 | /* We might have got these values via the command line or the | |
136 | * device tree, either way sanitise them now. */ | |
137 | ||
28f65c11 | 138 | crash_size = resource_size(&crashk_res); |
eabd9094 | 139 | |
0f890c8d | 140 | #ifndef CONFIG_NONSTATIC_KERNEL |
47585d8f ME |
141 | if (crashk_res.start != KDUMP_KERNELBASE) |
142 | printk("Crash kernel location must be 0x%x\n", | |
143 | KDUMP_KERNELBASE); | |
144 | ||
145 | crashk_res.start = KDUMP_KERNELBASE; | |
66c721e1 MM |
146 | #else |
147 | if (!crashk_res.start) { | |
8aa6d359 | 148 | #ifdef CONFIG_PPC64 |
66c721e1 | 149 | /* |
8aa6d359 AB |
150 | * On 64bit we split the RMO in half but cap it at half of |
151 | * a small SLB (128MB) since the crash kernel needs to place | |
152 | * itself and some stacks to be in the first segment. | |
66c721e1 | 153 | */ |
e641eb03 | 154 | crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2)); |
8aa6d359 | 155 | #else |
66c721e1 | 156 | crashk_res.start = KDUMP_KERNELBASE; |
8aa6d359 | 157 | #endif |
66c721e1 MM |
158 | } |
159 | ||
160 | crash_base = PAGE_ALIGN(crashk_res.start); | |
161 | if (crash_base != crashk_res.start) { | |
162 | printk("Crash kernel base must be aligned to 0x%lx\n", | |
163 | PAGE_SIZE); | |
164 | crashk_res.start = crash_base; | |
165 | } | |
166 | ||
54622f10 | 167 | #endif |
edd8ce67 BW |
168 | crash_size = PAGE_ALIGN(crash_size); |
169 | crashk_res.end = crashk_res.start + crash_size - 1; | |
47585d8f | 170 | |
66c721e1 MM |
171 | /* The crash region must not overlap the current kernel */ |
172 | if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { | |
173 | printk(KERN_WARNING | |
174 | "Crash kernel can not overlap current kernel\n"); | |
175 | crashk_res.start = crashk_res.end = 0; | |
176 | return; | |
177 | } | |
178 | ||
47585d8f ME |
179 | /* Crash kernel trumps memory limit */ |
180 | if (memory_limit && memory_limit <= crashk_res.end) { | |
181 | memory_limit = crashk_res.end + 1; | |
49a84965 | 182 | printk("Adjusted memory limit for crashkernel, now 0x%llx\n", |
a84fcd46 | 183 | memory_limit); |
47585d8f ME |
184 | } |
185 | ||
edd8ce67 BW |
186 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
187 | "for crashkernel (System RAM: %ldMB)\n", | |
188 | (unsigned long)(crash_size >> 20), | |
189 | (unsigned long)(crashk_res.start >> 20), | |
95f72d1e | 190 | (unsigned long)(memblock_phys_mem_size() >> 20)); |
edd8ce67 | 191 | |
8950329c HB |
192 | if (!memblock_is_region_memory(crashk_res.start, crash_size) || |
193 | memblock_reserve(crashk_res.start, crash_size)) { | |
194 | pr_err("Failed to reserve memory for crashkernel!\n"); | |
195 | crashk_res.start = crashk_res.end = 0; | |
196 | return; | |
197 | } | |
47585d8f ME |
198 | } |
199 | ||
200 | int overlaps_crashkernel(unsigned long start, unsigned long size) | |
201 | { | |
202 | return (start + size) > crashk_res.start && start <= crashk_res.end; | |
203 | } | |
2e8e4f5b DF |
204 | |
205 | /* Values we need to export to the second kernel via the device tree. */ | |
bbc8e30f | 206 | static phys_addr_t kernel_end; |
ea961a82 | 207 | static phys_addr_t crashk_base; |
bbc8e30f | 208 | static phys_addr_t crashk_size; |
ea961a82 | 209 | static unsigned long long mem_limit; |
2e8e4f5b DF |
210 | |
211 | static struct property kernel_end_prop = { | |
212 | .name = "linux,kernel-end", | |
bbc8e30f | 213 | .length = sizeof(phys_addr_t), |
2e8e4f5b DF |
214 | .value = &kernel_end, |
215 | }; | |
216 | ||
6f29c329 DF |
217 | static struct property crashk_base_prop = { |
218 | .name = "linux,crashkernel-base", | |
bbc8e30f | 219 | .length = sizeof(phys_addr_t), |
ea961a82 | 220 | .value = &crashk_base |
6f29c329 DF |
221 | }; |
222 | ||
223 | static struct property crashk_size_prop = { | |
224 | .name = "linux,crashkernel-size", | |
bbc8e30f | 225 | .length = sizeof(phys_addr_t), |
6f29c329 DF |
226 | .value = &crashk_size, |
227 | }; | |
228 | ||
4bc77a5e SP |
229 | static struct property memory_limit_prop = { |
230 | .name = "linux,memory-limit", | |
231 | .length = sizeof(unsigned long long), | |
ea961a82 | 232 | .value = &mem_limit, |
4bc77a5e SP |
233 | }; |
234 | ||
ea961a82 AB |
235 | #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG) |
236 | ||
6f29c329 DF |
237 | static void __init export_crashk_values(struct device_node *node) |
238 | { | |
6f29c329 DF |
239 | /* There might be existing crash kernel properties, but we can't |
240 | * be sure what's in them, so remove them. */ | |
925e2d1d SJS |
241 | of_remove_property(node, of_find_property(node, |
242 | "linux,crashkernel-base", NULL)); | |
243 | of_remove_property(node, of_find_property(node, | |
244 | "linux,crashkernel-size", NULL)); | |
6f29c329 DF |
245 | |
246 | if (crashk_res.start != 0) { | |
ea961a82 | 247 | crashk_base = cpu_to_be_ulong(crashk_res.start), |
79d1c712 | 248 | of_add_property(node, &crashk_base_prop); |
ea961a82 | 249 | crashk_size = cpu_to_be_ulong(resource_size(&crashk_res)); |
79d1c712 | 250 | of_add_property(node, &crashk_size_prop); |
6f29c329 | 251 | } |
4bc77a5e SP |
252 | |
253 | /* | |
254 | * memory_limit is required by the kexec-tools to limit the | |
255 | * crash regions to the actual memory used. | |
256 | */ | |
ea961a82 | 257 | mem_limit = cpu_to_be_ulong(memory_limit); |
79d1c712 | 258 | of_update_property(node, &memory_limit_prop); |
6f29c329 DF |
259 | } |
260 | ||
2e8e4f5b DF |
261 | static int __init kexec_setup(void) |
262 | { | |
263 | struct device_node *node; | |
2e8e4f5b DF |
264 | |
265 | node = of_find_node_by_path("/chosen"); | |
266 | if (!node) | |
267 | return -ENOENT; | |
268 | ||
269 | /* remove any stale properties so ours can be found */ | |
925e2d1d | 270 | of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL)); |
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); |