1 // SPDX-License-Identifier: GPL-2.0-only
3 * Code to handle transition of Linux booting another kernel.
5 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
6 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
7 * Copyright (C) 2005 IBM Corporation.
10 #include <linux/kexec.h>
11 #include <linux/reboot.h>
12 #include <linux/threads.h>
13 #include <linux/memblock.h>
15 #include <linux/irq.h>
16 #include <linux/ftrace.h>
18 #include <asm/kdump.h>
19 #include <asm/machdep.h>
20 #include <asm/pgalloc.h>
21 #include <asm/sections.h>
23 void machine_kexec_mask_interrupts(void) {
25 struct irq_desc *desc;
27 for_each_irq_desc(i, desc) {
28 struct irq_chip *chip;
30 chip = irq_desc_get_chip(desc);
34 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
35 chip->irq_eoi(&desc->irq_data);
38 chip->irq_mask(&desc->irq_data);
40 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
41 chip->irq_disable(&desc->irq_data);
45 void machine_crash_shutdown(struct pt_regs *regs)
47 default_machine_crash_shutdown(regs);
50 void machine_kexec_cleanup(struct kimage *image)
54 void arch_crash_save_vmcoreinfo(void)
58 VMCOREINFO_SYMBOL(node_data);
59 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
62 VMCOREINFO_SYMBOL(contig_page_data);
64 #if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
65 VMCOREINFO_SYMBOL(vmemmap_list);
66 VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
67 VMCOREINFO_SYMBOL(mmu_psize_defs);
68 VMCOREINFO_STRUCT_SIZE(vmemmap_backing);
69 VMCOREINFO_OFFSET(vmemmap_backing, list);
70 VMCOREINFO_OFFSET(vmemmap_backing, phys);
71 VMCOREINFO_OFFSET(vmemmap_backing, virt_addr);
72 VMCOREINFO_STRUCT_SIZE(mmu_psize_def);
73 VMCOREINFO_OFFSET(mmu_psize_def, shift);
75 vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset());
79 * Do not allocate memory (or fail in any way) in machine_kexec().
80 * We are past the point of no return, committed to rebooting now.
82 void machine_kexec(struct kimage *image)
84 int save_ftrace_enabled;
86 save_ftrace_enabled = __ftrace_enabled_save();
87 this_cpu_disable_ftrace();
89 if (ppc_md.machine_kexec)
90 ppc_md.machine_kexec(image);
92 default_machine_kexec(image);
94 this_cpu_enable_ftrace();
95 __ftrace_enabled_restore(save_ftrace_enabled);
97 /* Fall back to normal restart if we're still alive. */
98 machine_restart(NULL);
102 void __init reserve_crashkernel(void)
104 unsigned long long crash_size, crash_base, total_mem_sz;
107 total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size();
108 /* use common parsing */
109 ret = parse_crashkernel(boot_command_line, total_mem_sz,
110 &crash_size, &crash_base);
111 if (ret == 0 && crash_size > 0) {
112 crashk_res.start = crash_base;
113 crashk_res.end = crash_base + crash_size - 1;
116 if (crashk_res.end == crashk_res.start) {
117 crashk_res.start = crashk_res.end = 0;
121 /* We might have got these values via the command line or the
122 * device tree, either way sanitise them now. */
124 crash_size = resource_size(&crashk_res);
126 #ifndef CONFIG_NONSTATIC_KERNEL
127 if (crashk_res.start != KDUMP_KERNELBASE)
128 printk("Crash kernel location must be 0x%x\n",
131 crashk_res.start = KDUMP_KERNELBASE;
133 if (!crashk_res.start) {
136 * On the LPAR platform place the crash kernel to mid of
137 * RMA size (512MB or more) to ensure the crash kernel
138 * gets enough space to place itself and some stack to be
139 * in the first segment. At the same time normal kernel
140 * also get enough space to allocate memory for essential
141 * system resource in the first segment. Keep the crash
142 * kernel starts at 128MB offset on other platforms.
144 if (firmware_has_feature(FW_FEATURE_LPAR))
145 crashk_res.start = ppc64_rma_size / 2;
147 crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
149 crashk_res.start = KDUMP_KERNELBASE;
153 crash_base = PAGE_ALIGN(crashk_res.start);
154 if (crash_base != crashk_res.start) {
155 printk("Crash kernel base must be aligned to 0x%lx\n",
157 crashk_res.start = crash_base;
161 crash_size = PAGE_ALIGN(crash_size);
162 crashk_res.end = crashk_res.start + crash_size - 1;
164 /* The crash region must not overlap the current kernel */
165 if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
167 "Crash kernel can not overlap current kernel\n");
168 crashk_res.start = crashk_res.end = 0;
172 /* Crash kernel trumps memory limit */
173 if (memory_limit && memory_limit <= crashk_res.end) {
174 memory_limit = crashk_res.end + 1;
175 total_mem_sz = memory_limit;
176 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
180 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
181 "for crashkernel (System RAM: %ldMB)\n",
182 (unsigned long)(crash_size >> 20),
183 (unsigned long)(crashk_res.start >> 20),
184 (unsigned long)(total_mem_sz >> 20));
186 if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
187 memblock_reserve(crashk_res.start, crash_size)) {
188 pr_err("Failed to reserve memory for crashkernel!\n");
189 crashk_res.start = crashk_res.end = 0;
194 int __init overlaps_crashkernel(unsigned long start, unsigned long size)
196 return (start + size) > crashk_res.start && start <= crashk_res.end;
199 /* Values we need to export to the second kernel via the device tree. */
200 static phys_addr_t kernel_end;
201 static phys_addr_t crashk_base;
202 static phys_addr_t crashk_size;
203 static unsigned long long mem_limit;
205 static struct property kernel_end_prop = {
206 .name = "linux,kernel-end",
207 .length = sizeof(phys_addr_t),
208 .value = &kernel_end,
211 static struct property crashk_base_prop = {
212 .name = "linux,crashkernel-base",
213 .length = sizeof(phys_addr_t),
214 .value = &crashk_base
217 static struct property crashk_size_prop = {
218 .name = "linux,crashkernel-size",
219 .length = sizeof(phys_addr_t),
220 .value = &crashk_size,
223 static struct property memory_limit_prop = {
224 .name = "linux,memory-limit",
225 .length = sizeof(unsigned long long),
229 #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
231 static void __init export_crashk_values(struct device_node *node)
233 /* There might be existing crash kernel properties, but we can't
234 * be sure what's in them, so remove them. */
235 of_remove_property(node, of_find_property(node,
236 "linux,crashkernel-base", NULL));
237 of_remove_property(node, of_find_property(node,
238 "linux,crashkernel-size", NULL));
240 if (crashk_res.start != 0) {
241 crashk_base = cpu_to_be_ulong(crashk_res.start),
242 of_add_property(node, &crashk_base_prop);
243 crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
244 of_add_property(node, &crashk_size_prop);
248 * memory_limit is required by the kexec-tools to limit the
249 * crash regions to the actual memory used.
251 mem_limit = cpu_to_be_ulong(memory_limit);
252 of_update_property(node, &memory_limit_prop);
255 static int __init kexec_setup(void)
257 struct device_node *node;
259 node = of_find_node_by_path("/chosen");
263 /* remove any stale properties so ours can be found */
264 of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL));
266 /* information needed by userspace when using default_machine_kexec */
267 kernel_end = cpu_to_be_ulong(__pa(_end));
268 of_add_property(node, &kernel_end_prop);
270 export_crashk_values(node);
275 late_initcall(kexec_setup);