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12#include <linux/kexec.h>
13#include <linux/reboot.h>
14#include <linux/threads.h>
15#include <linux/memblock.h>
16#include <linux/of.h>
17#include <linux/irq.h>
18#include <linux/ftrace.h>
19
20#include <asm/machdep.h>
21#include <asm/prom.h>
22#include <asm/sections.h>
23
24void machine_kexec_mask_interrupts(void) {
25 unsigned int i;
26 struct irq_desc *desc;
27
28 for_each_irq_desc(i, desc) {
29 struct irq_chip *chip;
30
31 chip = irq_desc_get_chip(desc);
32 if (!chip)
33 continue;
34
35 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
36 chip->irq_eoi(&desc->irq_data);
37
38 if (chip->irq_mask)
39 chip->irq_mask(&desc->irq_data);
40
41 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
42 chip->irq_disable(&desc->irq_data);
43 }
44}
45
46void machine_crash_shutdown(struct pt_regs *regs)
47{
48 default_machine_crash_shutdown(regs);
49}
50
51
52
53
54
55
56int machine_kexec_prepare(struct kimage *image)
57{
58 if (ppc_md.machine_kexec_prepare)
59 return ppc_md.machine_kexec_prepare(image);
60 else
61 return default_machine_kexec_prepare(image);
62}
63
64void machine_kexec_cleanup(struct kimage *image)
65{
66}
67
68void arch_crash_save_vmcoreinfo(void)
69{
70
71#ifdef CONFIG_NEED_MULTIPLE_NODES
72 VMCOREINFO_SYMBOL(node_data);
73 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
74#endif
75#ifndef CONFIG_NEED_MULTIPLE_NODES
76 VMCOREINFO_SYMBOL(contig_page_data);
77#endif
78}
79
80
81
82
83
84void machine_kexec(struct kimage *image)
85{
86 int save_ftrace_enabled;
87
88 save_ftrace_enabled = __ftrace_enabled_save();
89
90 if (ppc_md.machine_kexec)
91 ppc_md.machine_kexec(image);
92 else
93 default_machine_kexec(image);
94
95 __ftrace_enabled_restore(save_ftrace_enabled);
96
97
98 machine_restart(NULL);
99 for(;;);
100}
101
102void __init reserve_crashkernel(void)
103{
104 unsigned long long crash_size, crash_base;
105 int ret;
106
107
108 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
109 &crash_size, &crash_base);
110 if (ret == 0 && crash_size > 0) {
111 crashk_res.start = crash_base;
112 crashk_res.end = crash_base + crash_size - 1;
113 }
114
115 if (crashk_res.end == crashk_res.start) {
116 crashk_res.start = crashk_res.end = 0;
117 return;
118 }
119
120
121
122
123 crash_size = resource_size(&crashk_res);
124
125#ifndef CONFIG_NONSTATIC_KERNEL
126 if (crashk_res.start != KDUMP_KERNELBASE)
127 printk("Crash kernel location must be 0x%x\n",
128 KDUMP_KERNELBASE);
129
130 crashk_res.start = KDUMP_KERNELBASE;
131#else
132 if (!crashk_res.start) {
133#ifdef CONFIG_PPC64
134
135
136
137
138
139 crashk_res.start = min(0x80000000ULL, (ppc64_rma_size / 2));
140#else
141 crashk_res.start = KDUMP_KERNELBASE;
142#endif
143 }
144
145 crash_base = PAGE_ALIGN(crashk_res.start);
146 if (crash_base != crashk_res.start) {
147 printk("Crash kernel base must be aligned to 0x%lx\n",
148 PAGE_SIZE);
149 crashk_res.start = crash_base;
150 }
151
152#endif
153 crash_size = PAGE_ALIGN(crash_size);
154 crashk_res.end = crashk_res.start + crash_size - 1;
155
156
157 if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
158 printk(KERN_WARNING
159 "Crash kernel can not overlap current kernel\n");
160 crashk_res.start = crashk_res.end = 0;
161 return;
162 }
163
164
165 if (memory_limit && memory_limit <= crashk_res.end) {
166 memory_limit = crashk_res.end + 1;
167 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
168 memory_limit);
169 }
170
171 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
172 "for crashkernel (System RAM: %ldMB)\n",
173 (unsigned long)(crash_size >> 20),
174 (unsigned long)(crashk_res.start >> 20),
175 (unsigned long)(memblock_phys_mem_size() >> 20));
176
177 memblock_reserve(crashk_res.start, crash_size);
178}
179
180int overlaps_crashkernel(unsigned long start, unsigned long size)
181{
182 return (start + size) > crashk_res.start && start <= crashk_res.end;
183}
184
185
186static phys_addr_t kernel_end;
187static phys_addr_t crashk_size;
188
189static struct property kernel_end_prop = {
190 .name = "linux,kernel-end",
191 .length = sizeof(phys_addr_t),
192 .value = &kernel_end,
193};
194
195static struct property crashk_base_prop = {
196 .name = "linux,crashkernel-base",
197 .length = sizeof(phys_addr_t),
198 .value = &crashk_res.start,
199};
200
201static struct property crashk_size_prop = {
202 .name = "linux,crashkernel-size",
203 .length = sizeof(phys_addr_t),
204 .value = &crashk_size,
205};
206
207static struct property memory_limit_prop = {
208 .name = "linux,memory-limit",
209 .length = sizeof(unsigned long long),
210 .value = &memory_limit,
211};
212
213static void __init export_crashk_values(struct device_node *node)
214{
215 struct property *prop;
216
217
218
219 prop = of_find_property(node, "linux,crashkernel-base", NULL);
220 if (prop)
221 of_remove_property(node, prop);
222
223 prop = of_find_property(node, "linux,crashkernel-size", NULL);
224 if (prop)
225 of_remove_property(node, prop);
226
227 if (crashk_res.start != 0) {
228 of_add_property(node, &crashk_base_prop);
229 crashk_size = resource_size(&crashk_res);
230 of_add_property(node, &crashk_size_prop);
231 }
232
233
234
235
236
237 of_update_property(node, &memory_limit_prop);
238}
239
240static int __init kexec_setup(void)
241{
242 struct device_node *node;
243 struct property *prop;
244
245 node = of_find_node_by_path("/chosen");
246 if (!node)
247 return -ENOENT;
248
249
250 prop = of_find_property(node, kernel_end_prop.name, NULL);
251 if (prop)
252 of_remove_property(node, prop);
253
254
255 kernel_end = __pa(_end);
256 of_add_property(node, &kernel_end_prop);
257
258 export_crashk_values(node);
259
260 of_node_put(node);
261 return 0;
262}
263late_initcall(kexec_setup);
264