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>
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/pgalloc.h>
22 #include <asm/prom.h>
23 #include <asm/sections.h>
24
machine_kexec_mask_interrupts(void)25 void machine_kexec_mask_interrupts(void) {
26 unsigned int i;
27 struct irq_desc *desc;
28
29 for_each_irq_desc(i, desc) {
30 struct irq_chip *chip;
31
32 chip = irq_desc_get_chip(desc);
33 if (!chip)
34 continue;
35
36 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
37 chip->irq_eoi(&desc->irq_data);
38
39 if (chip->irq_mask)
40 chip->irq_mask(&desc->irq_data);
41
42 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
43 chip->irq_disable(&desc->irq_data);
44 }
45 }
46
machine_crash_shutdown(struct pt_regs * regs)47 void machine_crash_shutdown(struct pt_regs *regs)
48 {
49 default_machine_crash_shutdown(regs);
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 */
machine_kexec_prepare(struct kimage * image)57 int machine_kexec_prepare(struct kimage *image)
58 {
59 if (ppc_md.machine_kexec_prepare)
60 return ppc_md.machine_kexec_prepare(image);
61 else
62 return default_machine_kexec_prepare(image);
63 }
64
machine_kexec_cleanup(struct kimage * image)65 void machine_kexec_cleanup(struct kimage *image)
66 {
67 }
68
arch_crash_save_vmcoreinfo(void)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
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
90 }
91
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 */
machine_kexec(struct kimage * image)96 void machine_kexec(struct kimage *image)
97 {
98 int save_ftrace_enabled;
99
100 save_ftrace_enabled = __ftrace_enabled_save();
101
102 if (ppc_md.machine_kexec)
103 ppc_md.machine_kexec(image);
104 else
105 default_machine_kexec(image);
106
107 __ftrace_enabled_restore(save_ftrace_enabled);
108
109 /* Fall back to normal restart if we're still alive. */
110 machine_restart(NULL);
111 for(;;);
112 }
113
reserve_crashkernel(void)114 void __init reserve_crashkernel(void)
115 {
116 unsigned long long crash_size, crash_base;
117 int ret;
118
119 /* use common parsing */
120 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
121 &crash_size, &crash_base);
122 if (ret == 0 && crash_size > 0) {
123 crashk_res.start = crash_base;
124 crashk_res.end = crash_base + crash_size - 1;
125 }
126
127 if (crashk_res.end == crashk_res.start) {
128 crashk_res.start = crashk_res.end = 0;
129 return;
130 }
131
132 /* We might have got these values via the command line or the
133 * device tree, either way sanitise them now. */
134
135 crash_size = resource_size(&crashk_res);
136
137 #ifndef CONFIG_NONSTATIC_KERNEL
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;
143 #else
144 if (!crashk_res.start) {
145 #ifdef CONFIG_PPC64
146 /*
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.
150 */
151 crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
152 #else
153 crashk_res.start = KDUMP_KERNELBASE;
154 #endif
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
164 #endif
165 crash_size = PAGE_ALIGN(crash_size);
166 crashk_res.end = crashk_res.start + crash_size - 1;
167
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
176 /* Crash kernel trumps memory limit */
177 if (memory_limit && memory_limit <= crashk_res.end) {
178 memory_limit = crashk_res.end + 1;
179 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
180 memory_limit);
181 }
182
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),
187 (unsigned long)(memblock_phys_mem_size() >> 20));
188
189 memblock_reserve(crashk_res.start, crash_size);
190 }
191
overlaps_crashkernel(unsigned long start,unsigned long size)192 int overlaps_crashkernel(unsigned long start, unsigned long size)
193 {
194 return (start + size) > crashk_res.start && start <= crashk_res.end;
195 }
196
197 /* Values we need to export to the second kernel via the device tree. */
198 static phys_addr_t kernel_end;
199 static phys_addr_t crashk_base;
200 static phys_addr_t crashk_size;
201 static unsigned long long mem_limit;
202
203 static struct property kernel_end_prop = {
204 .name = "linux,kernel-end",
205 .length = sizeof(phys_addr_t),
206 .value = &kernel_end,
207 };
208
209 static struct property crashk_base_prop = {
210 .name = "linux,crashkernel-base",
211 .length = sizeof(phys_addr_t),
212 .value = &crashk_base
213 };
214
215 static struct property crashk_size_prop = {
216 .name = "linux,crashkernel-size",
217 .length = sizeof(phys_addr_t),
218 .value = &crashk_size,
219 };
220
221 static struct property memory_limit_prop = {
222 .name = "linux,memory-limit",
223 .length = sizeof(unsigned long long),
224 .value = &mem_limit,
225 };
226
227 #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
228
export_crashk_values(struct device_node * node)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)
237 of_remove_property(node, prop);
238
239 prop = of_find_property(node, "linux,crashkernel-size", NULL);
240 if (prop)
241 of_remove_property(node, prop);
242
243 if (crashk_res.start != 0) {
244 crashk_base = cpu_to_be_ulong(crashk_res.start),
245 of_add_property(node, &crashk_base_prop);
246 crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
247 of_add_property(node, &crashk_size_prop);
248 }
249
250 /*
251 * memory_limit is required by the kexec-tools to limit the
252 * crash regions to the actual memory used.
253 */
254 mem_limit = cpu_to_be_ulong(memory_limit);
255 of_update_property(node, &memory_limit_prop);
256 }
257
kexec_setup(void)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)
270 of_remove_property(node, prop);
271
272 /* information needed by userspace when using default_machine_kexec */
273 kernel_end = cpu_to_be_ulong(__pa(_end));
274 of_add_property(node, &kernel_end_prop);
275
276 export_crashk_values(node);
277
278 of_node_put(node);
279 return 0;
280 }
281 late_initcall(kexec_setup);
282