2 * Code to handle transition of Linux booting another kernel.
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.
8 * This source code is licensed under the GNU General Public License,
9 * Version 2. See the file COPYING for more details.
12 #include <linux/kexec.h>
13 #include <linux/reboot.h>
14 #include <linux/threads.h>
15 #include <linux/memblock.h>
17 #include <linux/irq.h>
18 #include <linux/ftrace.h>
20 #include <asm/kdump.h>
21 #include <asm/machdep.h>
22 #include <asm/pgalloc.h>
24 #include <asm/sections.h>
26 void machine_kexec_mask_interrupts(void) {
28 struct irq_desc *desc;
30 for_each_irq_desc(i, desc) {
31 struct irq_chip *chip;
33 chip = irq_desc_get_chip(desc);
37 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
38 chip->irq_eoi(&desc->irq_data);
41 chip->irq_mask(&desc->irq_data);
43 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
44 chip->irq_disable(&desc->irq_data);
48 void machine_crash_shutdown(struct pt_regs *regs)
50 default_machine_crash_shutdown(regs);
54 * Do what every setup is needed on image and the
55 * reboot code buffer to allow us to avoid allocations
58 int machine_kexec_prepare(struct kimage *image)
60 if (ppc_md.machine_kexec_prepare)
61 return ppc_md.machine_kexec_prepare(image);
63 return default_machine_kexec_prepare(image);
66 void machine_kexec_cleanup(struct kimage *image)
70 void arch_crash_save_vmcoreinfo(void)
73 #ifdef CONFIG_NEED_MULTIPLE_NODES
74 VMCOREINFO_SYMBOL(node_data);
75 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
77 #ifndef CONFIG_NEED_MULTIPLE_NODES
78 VMCOREINFO_SYMBOL(contig_page_data);
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);
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.
97 void machine_kexec(struct kimage *image)
99 int save_ftrace_enabled;
101 save_ftrace_enabled = __ftrace_enabled_save();
102 this_cpu_disable_ftrace();
104 if (ppc_md.machine_kexec)
105 ppc_md.machine_kexec(image);
107 default_machine_kexec(image);
109 this_cpu_enable_ftrace();
110 __ftrace_enabled_restore(save_ftrace_enabled);
112 /* Fall back to normal restart if we're still alive. */
113 machine_restart(NULL);
117 void __init reserve_crashkernel(void)
119 unsigned long long crash_size, crash_base, total_mem_sz;
122 total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size();
123 /* use common parsing */
124 ret = parse_crashkernel(boot_command_line, total_mem_sz,
125 &crash_size, &crash_base);
126 if (ret == 0 && crash_size > 0) {
127 crashk_res.start = crash_base;
128 crashk_res.end = crash_base + crash_size - 1;
131 if (crashk_res.end == crashk_res.start) {
132 crashk_res.start = crashk_res.end = 0;
136 /* We might have got these values via the command line or the
137 * device tree, either way sanitise them now. */
139 crash_size = resource_size(&crashk_res);
141 #ifndef CONFIG_NONSTATIC_KERNEL
142 if (crashk_res.start != KDUMP_KERNELBASE)
143 printk("Crash kernel location must be 0x%x\n",
146 crashk_res.start = KDUMP_KERNELBASE;
148 if (!crashk_res.start) {
151 * On the LPAR platform place the crash kernel to mid of
152 * RMA size (512MB or more) to ensure the crash kernel
153 * gets enough space to place itself and some stack to be
154 * in the first segment. At the same time normal kernel
155 * also get enough space to allocate memory for essential
156 * system resource in the first segment. Keep the crash
157 * kernel starts at 128MB offset on other platforms.
159 if (firmware_has_feature(FW_FEATURE_LPAR))
160 crashk_res.start = ppc64_rma_size / 2;
162 crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
164 crashk_res.start = KDUMP_KERNELBASE;
168 crash_base = PAGE_ALIGN(crashk_res.start);
169 if (crash_base != crashk_res.start) {
170 printk("Crash kernel base must be aligned to 0x%lx\n",
172 crashk_res.start = crash_base;
176 crash_size = PAGE_ALIGN(crash_size);
177 crashk_res.end = crashk_res.start + crash_size - 1;
179 /* The crash region must not overlap the current kernel */
180 if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
182 "Crash kernel can not overlap current kernel\n");
183 crashk_res.start = crashk_res.end = 0;
187 /* Crash kernel trumps memory limit */
188 if (memory_limit && memory_limit <= crashk_res.end) {
189 memory_limit = crashk_res.end + 1;
190 total_mem_sz = memory_limit;
191 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
195 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
196 "for crashkernel (System RAM: %ldMB)\n",
197 (unsigned long)(crash_size >> 20),
198 (unsigned long)(crashk_res.start >> 20),
199 (unsigned long)(total_mem_sz >> 20));
201 if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
202 memblock_reserve(crashk_res.start, crash_size)) {
203 pr_err("Failed to reserve memory for crashkernel!\n");
204 crashk_res.start = crashk_res.end = 0;
209 int overlaps_crashkernel(unsigned long start, unsigned long size)
211 return (start + size) > crashk_res.start && start <= crashk_res.end;
214 /* Values we need to export to the second kernel via the device tree. */
215 static phys_addr_t kernel_end;
216 static phys_addr_t crashk_base;
217 static phys_addr_t crashk_size;
218 static unsigned long long mem_limit;
220 static struct property kernel_end_prop = {
221 .name = "linux,kernel-end",
222 .length = sizeof(phys_addr_t),
223 .value = &kernel_end,
226 static struct property crashk_base_prop = {
227 .name = "linux,crashkernel-base",
228 .length = sizeof(phys_addr_t),
229 .value = &crashk_base
232 static struct property crashk_size_prop = {
233 .name = "linux,crashkernel-size",
234 .length = sizeof(phys_addr_t),
235 .value = &crashk_size,
238 static struct property memory_limit_prop = {
239 .name = "linux,memory-limit",
240 .length = sizeof(unsigned long long),
244 #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
246 static void __init export_crashk_values(struct device_node *node)
248 /* There might be existing crash kernel properties, but we can't
249 * be sure what's in them, so remove them. */
250 of_remove_property(node, of_find_property(node,
251 "linux,crashkernel-base", NULL));
252 of_remove_property(node, of_find_property(node,
253 "linux,crashkernel-size", NULL));
255 if (crashk_res.start != 0) {
256 crashk_base = cpu_to_be_ulong(crashk_res.start),
257 of_add_property(node, &crashk_base_prop);
258 crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
259 of_add_property(node, &crashk_size_prop);
263 * memory_limit is required by the kexec-tools to limit the
264 * crash regions to the actual memory used.
266 mem_limit = cpu_to_be_ulong(memory_limit);
267 of_update_property(node, &memory_limit_prop);
270 static int __init kexec_setup(void)
272 struct device_node *node;
274 node = of_find_node_by_path("/chosen");
278 /* remove any stale properties so ours can be found */
279 of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL));
281 /* information needed by userspace when using default_machine_kexec */
282 kernel_end = cpu_to_be_ulong(__pa(_end));
283 of_add_property(node, &kernel_end_prop);
285 export_crashk_values(node);
290 late_initcall(kexec_setup);