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Michael Ellerman3d1229d2005-11-14 23:35:00 +11001/*
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>
Yinghai Lu95f72d12010-07-12 14:36:09 +100015#include <linux/memblock.h>
Dale Farnsworth2e8e4f52008-12-16 06:22:59 +000016#include <linux/of.h>
Matthew McClintockc71635d2010-09-16 17:58:23 -050017#include <linux/irq.h>
Anton Blanchardac4414e42011-01-06 18:00:36 +000018#include <linux/ftrace.h>
Matthew McClintockc71635d2010-09-16 17:58:23 -050019
Michael Ellerman3d1229d2005-11-14 23:35:00 +110020#include <asm/machdep.h>
David S. Millerd9b2b2a2008-02-13 16:56:49 -080021#include <asm/prom.h>
Dale Farnsworth2e8e4f52008-12-16 06:22:59 +000022#include <asm/sections.h>
Michael Ellerman3d1229d2005-11-14 23:35:00 +110023
Matthew McClintockc71635d2010-09-16 17:58:23 -050024void machine_kexec_mask_interrupts(void) {
25 unsigned int i;
26
27 for_each_irq(i) {
28 struct irq_desc *desc = irq_to_desc(i);
29
30 if (!desc || !desc->chip)
31 continue;
32
33 if (desc->chip->eoi &&
34 desc->status & IRQ_INPROGRESS)
35 desc->chip->eoi(i);
36
37 if (desc->chip->mask)
38 desc->chip->mask(i);
39
40 if (desc->chip->disable &&
41 !(desc->status & IRQ_DISABLED))
42 desc->chip->disable(i);
43 }
44}
45
Michael Ellerman3d1229d2005-11-14 23:35:00 +110046void machine_crash_shutdown(struct pt_regs *regs)
47{
Anton Blanchardc1f784e2011-01-06 17:56:09 +000048 default_machine_crash_shutdown(regs);
Michael Ellerman3d1229d2005-11-14 23:35:00 +110049}
50
51/*
52 * Do what every setup is needed on image and the
53 * reboot code buffer to allow us to avoid allocations
54 * later.
55 */
56int machine_kexec_prepare(struct kimage *image)
57{
58 if (ppc_md.machine_kexec_prepare)
59 return ppc_md.machine_kexec_prepare(image);
Anton Vorontsov77733f82008-12-16 06:23:05 +000060 else
61 return default_machine_kexec_prepare(image);
Michael Ellerman3d1229d2005-11-14 23:35:00 +110062}
63
64void machine_kexec_cleanup(struct kimage *image)
65{
Michael Ellerman3d1229d2005-11-14 23:35:00 +110066}
67
Neil Horman67238fb2010-07-13 03:46:09 +000068void 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
Michael Ellerman3d1229d2005-11-14 23:35:00 +110080/*
81 * Do not allocate memory (or fail in any way) in machine_kexec().
82 * We are past the point of no return, committed to rebooting now.
83 */
Huang Ying3ab83522008-07-25 19:45:07 -070084void machine_kexec(struct kimage *image)
Michael Ellerman3d1229d2005-11-14 23:35:00 +110085{
Anton Blanchardac4414e42011-01-06 18:00:36 +000086 int save_ftrace_enabled;
87
88 save_ftrace_enabled = __ftrace_enabled_save();
89
Anton Blanchard357574c2011-02-23 12:46:16 +000090 if (ppc_md.machine_kexec)
91 ppc_md.machine_kexec(image);
92 else
93 default_machine_kexec(image);
Anton Vorontsov77733f82008-12-16 06:23:05 +000094
Anton Blanchardac4414e42011-01-06 18:00:36 +000095 __ftrace_enabled_restore(save_ftrace_enabled);
96
Anton Vorontsov77733f82008-12-16 06:23:05 +000097 /* Fall back to normal restart if we're still alive. */
98 machine_restart(NULL);
Michael Ellerman3d1229d2005-11-14 23:35:00 +110099 for(;;);
100}
Michael Ellerman47585d82006-07-05 14:39:42 +1000101
Michael Ellerman47585d82006-07-05 14:39:42 +1000102void __init reserve_crashkernel(void)
103{
Bernhard Walleedd8ce62007-10-18 23:41:01 -0700104 unsigned long long crash_size, crash_base;
105 int ret;
Michael Ellerman47585d82006-07-05 14:39:42 +1000106
Yinghai Lu95f72d12010-07-12 14:36:09 +1000107 /* this is necessary because of memblock_phys_mem_size() */
108 memblock_analyze();
Bernhard Walleedd8ce62007-10-18 23:41:01 -0700109
110 /* use common parsing */
Yinghai Lu95f72d12010-07-12 14:36:09 +1000111 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
Bernhard Walleedd8ce62007-10-18 23:41:01 -0700112 &crash_size, &crash_base);
113 if (ret == 0 && crash_size > 0) {
Bernhard Walleedd8ce62007-10-18 23:41:01 -0700114 crashk_res.start = crash_base;
Michael Ellermaneabd9092008-04-30 14:47:12 +1000115 crashk_res.end = crash_base + crash_size - 1;
Bernhard Walleedd8ce62007-10-18 23:41:01 -0700116 }
117
Michael Ellermaneabd9092008-04-30 14:47:12 +1000118 if (crashk_res.end == crashk_res.start) {
119 crashk_res.start = crashk_res.end = 0;
Michael Ellerman47585d82006-07-05 14:39:42 +1000120 return;
Michael Ellermaneabd9092008-04-30 14:47:12 +1000121 }
Michael Ellerman47585d82006-07-05 14:39:42 +1000122
123 /* We might have got these values via the command line or the
124 * device tree, either way sanitise them now. */
125
Michael Ellermaneabd9092008-04-30 14:47:12 +1000126 crash_size = crashk_res.end - crashk_res.start + 1;
127
Mohan Kumar M54622f12008-10-21 17:38:10 +0000128#ifndef CONFIG_RELOCATABLE
Michael Ellerman47585d82006-07-05 14:39:42 +1000129 if (crashk_res.start != KDUMP_KERNELBASE)
130 printk("Crash kernel location must be 0x%x\n",
131 KDUMP_KERNELBASE);
132
133 crashk_res.start = KDUMP_KERNELBASE;
Milton Miller66c721e2009-01-02 10:46:15 +0000134#else
135 if (!crashk_res.start) {
136 /*
137 * unspecified address, choose a region of specified size
138 * can overlap with initrd (ignoring corruption when retained)
139 * ppc64 requires kernel and some stacks to be in first segemnt
140 */
141 crashk_res.start = KDUMP_KERNELBASE;
142 }
143
144 crash_base = PAGE_ALIGN(crashk_res.start);
145 if (crash_base != crashk_res.start) {
146 printk("Crash kernel base must be aligned to 0x%lx\n",
147 PAGE_SIZE);
148 crashk_res.start = crash_base;
149 }
150
Mohan Kumar M54622f12008-10-21 17:38:10 +0000151#endif
Bernhard Walleedd8ce62007-10-18 23:41:01 -0700152 crash_size = PAGE_ALIGN(crash_size);
153 crashk_res.end = crashk_res.start + crash_size - 1;
Michael Ellerman47585d82006-07-05 14:39:42 +1000154
Milton Miller66c721e2009-01-02 10:46:15 +0000155 /* The crash region must not overlap the current kernel */
156 if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
157 printk(KERN_WARNING
158 "Crash kernel can not overlap current kernel\n");
159 crashk_res.start = crashk_res.end = 0;
160 return;
161 }
162
Michael Ellerman47585d82006-07-05 14:39:42 +1000163 /* Crash kernel trumps memory limit */
164 if (memory_limit && memory_limit <= crashk_res.end) {
165 memory_limit = crashk_res.end + 1;
Becky Bruce49a84962009-05-08 12:19:27 +0000166 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
167 (unsigned long long)memory_limit);
Michael Ellerman47585d82006-07-05 14:39:42 +1000168 }
169
Bernhard Walleedd8ce62007-10-18 23:41:01 -0700170 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
171 "for crashkernel (System RAM: %ldMB)\n",
172 (unsigned long)(crash_size >> 20),
173 (unsigned long)(crashk_res.start >> 20),
Yinghai Lu95f72d12010-07-12 14:36:09 +1000174 (unsigned long)(memblock_phys_mem_size() >> 20));
Bernhard Walleedd8ce62007-10-18 23:41:01 -0700175
Yinghai Lu95f72d12010-07-12 14:36:09 +1000176 memblock_reserve(crashk_res.start, crash_size);
Michael Ellerman47585d82006-07-05 14:39:42 +1000177}
178
179int overlaps_crashkernel(unsigned long start, unsigned long size)
180{
181 return (start + size) > crashk_res.start && start <= crashk_res.end;
182}
Dale Farnsworth2e8e4f52008-12-16 06:22:59 +0000183
184/* Values we need to export to the second kernel via the device tree. */
Matthew McClintockbbc8e302010-07-21 11:14:54 +0000185static phys_addr_t kernel_end;
186static phys_addr_t crashk_size;
Dale Farnsworth2e8e4f52008-12-16 06:22:59 +0000187
188static struct property kernel_end_prop = {
189 .name = "linux,kernel-end",
Matthew McClintockbbc8e302010-07-21 11:14:54 +0000190 .length = sizeof(phys_addr_t),
Dale Farnsworth2e8e4f52008-12-16 06:22:59 +0000191 .value = &kernel_end,
192};
193
Dale Farnsworth6f29c322008-12-17 10:09:06 +0000194static struct property crashk_base_prop = {
195 .name = "linux,crashkernel-base",
Matthew McClintockbbc8e302010-07-21 11:14:54 +0000196 .length = sizeof(phys_addr_t),
Dale Farnsworth6f29c322008-12-17 10:09:06 +0000197 .value = &crashk_res.start,
198};
199
200static struct property crashk_size_prop = {
201 .name = "linux,crashkernel-size",
Matthew McClintockbbc8e302010-07-21 11:14:54 +0000202 .length = sizeof(phys_addr_t),
Dale Farnsworth6f29c322008-12-17 10:09:06 +0000203 .value = &crashk_size,
204};
205
206static void __init export_crashk_values(struct device_node *node)
207{
208 struct property *prop;
209
210 /* There might be existing crash kernel properties, but we can't
211 * be sure what's in them, so remove them. */
212 prop = of_find_property(node, "linux,crashkernel-base", NULL);
213 if (prop)
214 prom_remove_property(node, prop);
215
216 prop = of_find_property(node, "linux,crashkernel-size", NULL);
217 if (prop)
218 prom_remove_property(node, prop);
219
220 if (crashk_res.start != 0) {
221 prom_add_property(node, &crashk_base_prop);
222 crashk_size = crashk_res.end - crashk_res.start + 1;
223 prom_add_property(node, &crashk_size_prop);
224 }
225}
226
Dale Farnsworth2e8e4f52008-12-16 06:22:59 +0000227static int __init kexec_setup(void)
228{
229 struct device_node *node;
230 struct property *prop;
231
232 node = of_find_node_by_path("/chosen");
233 if (!node)
234 return -ENOENT;
235
236 /* remove any stale properties so ours can be found */
237 prop = of_find_property(node, kernel_end_prop.name, NULL);
238 if (prop)
239 prom_remove_property(node, prop);
240
241 /* information needed by userspace when using default_machine_kexec */
242 kernel_end = __pa(_end);
243 prom_add_property(node, &kernel_end_prop);
244
Dale Farnsworth6f29c322008-12-17 10:09:06 +0000245 export_crashk_values(node);
246
Dale Farnsworth2e8e4f52008-12-16 06:22:59 +0000247 of_node_put(node);
248 return 0;
249}
250late_initcall(kexec_setup);