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/machdep.h>
21 #include <asm/pgalloc.h>
23 #include <asm/sections.h>
25 void machine_kexec_mask_interrupts(void) {
27 struct irq_desc *desc;
29 for_each_irq_desc(i, desc) {
30 struct irq_chip *chip;
32 chip = irq_desc_get_chip(desc);
36 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
37 chip->irq_eoi(&desc->irq_data);
40 chip->irq_mask(&desc->irq_data);
42 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
43 chip->irq_disable(&desc->irq_data);
47 void machine_crash_shutdown(struct pt_regs *regs)
49 default_machine_crash_shutdown(regs);
53 * Do what every setup is needed on image and the
54 * reboot code buffer to allow us to avoid allocations
57 int machine_kexec_prepare(struct kimage *image)
59 if (ppc_md.machine_kexec_prepare)
60 return ppc_md.machine_kexec_prepare(image);
62 return default_machine_kexec_prepare(image);
65 void machine_kexec_cleanup(struct kimage *image)
69 void arch_crash_save_vmcoreinfo(void)
72 #ifdef CONFIG_NEED_MULTIPLE_NODES
73 VMCOREINFO_SYMBOL(node_data);
74 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
76 #ifndef CONFIG_NEED_MULTIPLE_NODES
77 VMCOREINFO_SYMBOL(contig_page_data);
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);
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.
96 void machine_kexec(struct kimage *image)
98 int save_ftrace_enabled;
100 save_ftrace_enabled = __ftrace_enabled_save();
102 if (ppc_md.machine_kexec)
103 ppc_md.machine_kexec(image);
105 default_machine_kexec(image);
107 __ftrace_enabled_restore(save_ftrace_enabled);
109 /* Fall back to normal restart if we're still alive. */
110 machine_restart(NULL);
114 void __init reserve_crashkernel(void)
116 unsigned long long crash_size, crash_base, total_mem_sz;
119 total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size();
120 /* use common parsing */
121 ret = parse_crashkernel(boot_command_line, total_mem_sz,
122 &crash_size, &crash_base);
123 if (ret == 0 && crash_size > 0) {
124 crashk_res.start = crash_base;
125 crashk_res.end = crash_base + crash_size - 1;
128 if (crashk_res.end == crashk_res.start) {
129 crashk_res.start = crashk_res.end = 0;
133 /* We might have got these values via the command line or the
134 * device tree, either way sanitise them now. */
136 crash_size = resource_size(&crashk_res);
138 #ifndef CONFIG_NONSTATIC_KERNEL
139 if (crashk_res.start != KDUMP_KERNELBASE)
140 printk("Crash kernel location must be 0x%x\n",
143 crashk_res.start = KDUMP_KERNELBASE;
145 if (!crashk_res.start) {
148 * On 64bit we split the RMO in half but cap it at half of
149 * a small SLB (128MB) since the crash kernel needs to place
150 * itself and some stacks to be in the first segment.
152 crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
154 crashk_res.start = KDUMP_KERNELBASE;
158 crash_base = PAGE_ALIGN(crashk_res.start);
159 if (crash_base != crashk_res.start) {
160 printk("Crash kernel base must be aligned to 0x%lx\n",
162 crashk_res.start = crash_base;
166 crash_size = PAGE_ALIGN(crash_size);
167 crashk_res.end = crashk_res.start + crash_size - 1;
169 /* The crash region must not overlap the current kernel */
170 if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
172 "Crash kernel can not overlap current kernel\n");
173 crashk_res.start = crashk_res.end = 0;
177 /* Crash kernel trumps memory limit */
178 if (memory_limit && memory_limit <= crashk_res.end) {
179 memory_limit = crashk_res.end + 1;
180 total_mem_sz = memory_limit;
181 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
185 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
186 "for crashkernel (System RAM: %ldMB)\n",
187 (unsigned long)(crash_size >> 20),
188 (unsigned long)(crashk_res.start >> 20),
189 (unsigned long)(total_mem_sz >> 20));
191 if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
192 memblock_reserve(crashk_res.start, crash_size)) {
193 pr_err("Failed to reserve memory for crashkernel!\n");
194 crashk_res.start = crashk_res.end = 0;
199 int overlaps_crashkernel(unsigned long start, unsigned long size)
201 return (start + size) > crashk_res.start && start <= crashk_res.end;
204 /* Values we need to export to the second kernel via the device tree. */
205 static phys_addr_t kernel_end;
206 static phys_addr_t crashk_base;
207 static phys_addr_t crashk_size;
208 static unsigned long long mem_limit;
210 static struct property kernel_end_prop = {
211 .name = "linux,kernel-end",
212 .length = sizeof(phys_addr_t),
213 .value = &kernel_end,
216 static struct property crashk_base_prop = {
217 .name = "linux,crashkernel-base",
218 .length = sizeof(phys_addr_t),
219 .value = &crashk_base
222 static struct property crashk_size_prop = {
223 .name = "linux,crashkernel-size",
224 .length = sizeof(phys_addr_t),
225 .value = &crashk_size,
228 static struct property memory_limit_prop = {
229 .name = "linux,memory-limit",
230 .length = sizeof(unsigned long long),
234 #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
236 static void __init export_crashk_values(struct device_node *node)
238 struct property *prop;
240 /* There might be existing crash kernel properties, but we can't
241 * be sure what's in them, so remove them. */
242 prop = of_find_property(node, "linux,crashkernel-base", NULL);
244 of_remove_property(node, prop);
246 prop = of_find_property(node, "linux,crashkernel-size", NULL);
248 of_remove_property(node, prop);
250 if (crashk_res.start != 0) {
251 crashk_base = cpu_to_be_ulong(crashk_res.start),
252 of_add_property(node, &crashk_base_prop);
253 crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
254 of_add_property(node, &crashk_size_prop);
258 * memory_limit is required by the kexec-tools to limit the
259 * crash regions to the actual memory used.
261 mem_limit = cpu_to_be_ulong(memory_limit);
262 of_update_property(node, &memory_limit_prop);
265 static int __init kexec_setup(void)
267 struct device_node *node;
268 struct property *prop;
270 node = of_find_node_by_path("/chosen");
274 /* remove any stale properties so ours can be found */
275 prop = of_find_property(node, kernel_end_prop.name, NULL);
277 of_remove_property(node, prop);
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);