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>
22 #include <asm/sections.h>
24 void machine_kexec_mask_interrupts(void) {
26 struct irq_desc *desc;
28 for_each_irq_desc(i, desc) {
29 struct irq_chip *chip;
31 chip = irq_desc_get_chip(desc);
35 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
36 chip->irq_eoi(&desc->irq_data);
39 chip->irq_mask(&desc->irq_data);
41 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
42 chip->irq_disable(&desc->irq_data);
46 void machine_crash_shutdown(struct pt_regs *regs)
48 default_machine_crash_shutdown(regs);
52 * Do what every setup is needed on image and the
53 * reboot code buffer to allow us to avoid allocations
56 int machine_kexec_prepare(struct kimage *image)
58 if (ppc_md.machine_kexec_prepare)
59 return ppc_md.machine_kexec_prepare(image);
61 return default_machine_kexec_prepare(image);
64 void machine_kexec_cleanup(struct kimage *image)
68 void arch_crash_save_vmcoreinfo(void)
71 #ifdef CONFIG_NEED_MULTIPLE_NODES
72 VMCOREINFO_SYMBOL(node_data);
73 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
75 #ifndef CONFIG_NEED_MULTIPLE_NODES
76 VMCOREINFO_SYMBOL(contig_page_data);
78 #if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
79 VMCOREINFO_SYMBOL(vmemmap_list);
80 VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
81 VMCOREINFO_SYMBOL(mmu_psize_defs);
82 VMCOREINFO_STRUCT_SIZE(vmemmap_backing);
83 VMCOREINFO_OFFSET(vmemmap_backing, list);
84 VMCOREINFO_OFFSET(vmemmap_backing, phys);
85 VMCOREINFO_OFFSET(vmemmap_backing, virt_addr);
86 VMCOREINFO_STRUCT_SIZE(mmu_psize_def);
87 VMCOREINFO_OFFSET(mmu_psize_def, shift);
92 * Do not allocate memory (or fail in any way) in machine_kexec().
93 * We are past the point of no return, committed to rebooting now.
95 void machine_kexec(struct kimage *image)
97 int save_ftrace_enabled;
99 save_ftrace_enabled = __ftrace_enabled_save();
100 this_cpu_disable_ftrace();
102 if (ppc_md.machine_kexec)
103 ppc_md.machine_kexec(image);
105 default_machine_kexec(image);
107 this_cpu_enable_ftrace();
108 __ftrace_enabled_restore(save_ftrace_enabled);
110 /* Fall back to normal restart if we're still alive. */
111 machine_restart(NULL);
115 void __init reserve_crashkernel(void)
117 unsigned long long crash_size, crash_base, total_mem_sz;
120 total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size();
121 /* use common parsing */
122 ret = parse_crashkernel(boot_command_line, total_mem_sz,
123 &crash_size, &crash_base);
124 if (ret == 0 && crash_size > 0) {
125 crashk_res.start = crash_base;
126 crashk_res.end = crash_base + crash_size - 1;
129 if (crashk_res.end == crashk_res.start) {
130 crashk_res.start = crashk_res.end = 0;
134 /* We might have got these values via the command line or the
135 * device tree, either way sanitise them now. */
137 crash_size = resource_size(&crashk_res);
139 #ifndef CONFIG_NONSTATIC_KERNEL
140 if (crashk_res.start != KDUMP_KERNELBASE)
141 printk("Crash kernel location must be 0x%x\n",
144 crashk_res.start = KDUMP_KERNELBASE;
146 if (!crashk_res.start) {
149 * On the LPAR platform place the crash kernel to mid of
150 * RMA size (512MB or more) to ensure the crash kernel
151 * gets enough space to place itself and some stack to be
152 * in the first segment. At the same time normal kernel
153 * also get enough space to allocate memory for essential
154 * system resource in the first segment. Keep the crash
155 * kernel starts at 128MB offset on other platforms.
157 if (firmware_has_feature(FW_FEATURE_LPAR))
158 crashk_res.start = ppc64_rma_size / 2;
160 crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
162 crashk_res.start = KDUMP_KERNELBASE;
166 crash_base = PAGE_ALIGN(crashk_res.start);
167 if (crash_base != crashk_res.start) {
168 printk("Crash kernel base must be aligned to 0x%lx\n",
170 crashk_res.start = crash_base;
174 crash_size = PAGE_ALIGN(crash_size);
175 crashk_res.end = crashk_res.start + crash_size - 1;
177 /* The crash region must not overlap the current kernel */
178 if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
180 "Crash kernel can not overlap current kernel\n");
181 crashk_res.start = crashk_res.end = 0;
185 /* Crash kernel trumps memory limit */
186 if (memory_limit && memory_limit <= crashk_res.end) {
187 memory_limit = crashk_res.end + 1;
188 total_mem_sz = memory_limit;
189 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
193 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
194 "for crashkernel (System RAM: %ldMB)\n",
195 (unsigned long)(crash_size >> 20),
196 (unsigned long)(crashk_res.start >> 20),
197 (unsigned long)(total_mem_sz >> 20));
199 if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
200 memblock_reserve(crashk_res.start, crash_size)) {
201 pr_err("Failed to reserve memory for crashkernel!\n");
202 crashk_res.start = crashk_res.end = 0;
207 int overlaps_crashkernel(unsigned long start, unsigned long size)
209 return (start + size) > crashk_res.start && start <= crashk_res.end;
212 /* Values we need to export to the second kernel via the device tree. */
213 static phys_addr_t kernel_end;
214 static phys_addr_t crashk_base;
215 static phys_addr_t crashk_size;
216 static unsigned long long mem_limit;
218 static struct property kernel_end_prop = {
219 .name = "linux,kernel-end",
220 .length = sizeof(phys_addr_t),
221 .value = &kernel_end,
224 static struct property crashk_base_prop = {
225 .name = "linux,crashkernel-base",
226 .length = sizeof(phys_addr_t),
227 .value = &crashk_base
230 static struct property crashk_size_prop = {
231 .name = "linux,crashkernel-size",
232 .length = sizeof(phys_addr_t),
233 .value = &crashk_size,
236 static struct property memory_limit_prop = {
237 .name = "linux,memory-limit",
238 .length = sizeof(unsigned long long),
242 #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
244 static void __init export_crashk_values(struct device_node *node)
246 /* There might be existing crash kernel properties, but we can't
247 * be sure what's in them, so remove them. */
248 of_remove_property(node, of_find_property(node,
249 "linux,crashkernel-base", NULL));
250 of_remove_property(node, of_find_property(node,
251 "linux,crashkernel-size", NULL));
253 if (crashk_res.start != 0) {
254 crashk_base = cpu_to_be_ulong(crashk_res.start),
255 of_add_property(node, &crashk_base_prop);
256 crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
257 of_add_property(node, &crashk_size_prop);
261 * memory_limit is required by the kexec-tools to limit the
262 * crash regions to the actual memory used.
264 mem_limit = cpu_to_be_ulong(memory_limit);
265 of_update_property(node, &memory_limit_prop);
268 static int __init kexec_setup(void)
270 struct device_node *node;
272 node = of_find_node_by_path("/chosen");
276 /* remove any stale properties so ours can be found */
277 of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL));
279 /* information needed by userspace when using default_machine_kexec */
280 kernel_end = cpu_to_be_ulong(__pa(_end));
281 of_add_property(node, &kernel_end_prop);
283 export_crashk_values(node);
288 late_initcall(kexec_setup);