// SPDX-License-Identifier: GPL-2.0
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/*
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* machine_kexec.c - handle transition of Linux booting another kernel
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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*
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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* LANDISK/sh4 supported by kogiidena
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*/
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/numa.h>
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#include <linux/ftrace.h>
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#include <linux/suspend.h>
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#include <linux/memblock.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/cacheflush.h>
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#include <asm/sh_bios.h>
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#include <asm/reboot.h>
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typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
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unsigned long reboot_code_buffer,
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unsigned long start_address);
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extern const unsigned char relocate_new_kernel[];
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extern const unsigned int relocate_new_kernel_size;
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extern void *vbr_base;
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void native_machine_crash_shutdown(struct pt_regs *regs)
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{
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/* Nothing to do for UP, but definitely broken for SMP.. */
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}
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/*
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* Do what every setup is needed on image and the
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* reboot code buffer to allow us to avoid allocations
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* later.
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*/
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int machine_kexec_prepare(struct kimage *image)
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{
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return 0;
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}
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void machine_kexec_cleanup(struct kimage *image)
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{
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}
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static void kexec_info(struct kimage *image)
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{
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int i;
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printk("kexec information\n");
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for (i = 0; i < image->nr_segments; i++) {
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printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
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i,
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(unsigned int)image->segment[i].mem,
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(unsigned int)image->segment[i].mem +
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image->segment[i].memsz,
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(unsigned int)image->segment[i].memsz);
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}
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printk(" start : 0x%08x\n\n", (unsigned int)image->start);
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}
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/*
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* Do not allocate memory (or fail in any way) in machine_kexec().
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* We are past the point of no return, committed to rebooting now.
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*/
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void machine_kexec(struct kimage *image)
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{
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unsigned long page_list;
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unsigned long reboot_code_buffer;
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relocate_new_kernel_t rnk;
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unsigned long entry;
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unsigned long *ptr;
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int save_ftrace_enabled;
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/*
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* Nicked from the mips version of machine_kexec():
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* The generic kexec code builds a page list with physical
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* addresses. Use phys_to_virt() to convert them to virtual.
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*/
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for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
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ptr = (entry & IND_INDIRECTION) ?
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phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
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if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
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*ptr & IND_DESTINATION)
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*ptr = (unsigned long) phys_to_virt(*ptr);
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}
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#ifdef CONFIG_KEXEC_JUMP
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if (image->preserve_context)
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save_processor_state();
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#endif
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save_ftrace_enabled = __ftrace_enabled_save();
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/* Interrupts aren't acceptable while we reboot */
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local_irq_disable();
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page_list = image->head;
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/* we need both effective and real address here */
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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/* copy our kernel relocation code to the control code page */
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memcpy((void *)reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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kexec_info(image);
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flush_cache_all();
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sh_bios_vbr_reload();
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/* now call it */
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rnk = (relocate_new_kernel_t) reboot_code_buffer;
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(*rnk)(page_list, reboot_code_buffer,
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(unsigned long)phys_to_virt(image->start));
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#ifdef CONFIG_KEXEC_JUMP
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asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
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if (image->preserve_context)
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restore_processor_state();
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/* Convert page list back to physical addresses, what a mess. */
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for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
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ptr = (*ptr & IND_INDIRECTION) ?
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phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
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if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
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*ptr & IND_DESTINATION)
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*ptr = virt_to_phys(*ptr);
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}
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#endif
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__ftrace_enabled_restore(save_ftrace_enabled);
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}
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void arch_crash_save_vmcoreinfo(void)
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{
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#ifdef CONFIG_NUMA
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VMCOREINFO_SYMBOL(node_data);
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VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
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#endif
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#ifdef CONFIG_X2TLB
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VMCOREINFO_CONFIG(X2TLB);
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#endif
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}
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void __init reserve_crashkernel(void)
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{
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unsigned long long crash_size, crash_base;
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int ret;
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ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
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&crash_size, &crash_base);
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if (ret == 0 && crash_size > 0) {
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crashk_res.start = crash_base;
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crashk_res.end = crash_base + crash_size - 1;
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}
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if (crashk_res.end == crashk_res.start)
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goto disable;
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crash_size = PAGE_ALIGN(resource_size(&crashk_res));
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if (!crashk_res.start) {
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unsigned long max = memblock_end_of_DRAM() - memory_limit;
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crashk_res.start = memblock_phys_alloc_range(crash_size,
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PAGE_SIZE, 0, max);
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if (!crashk_res.start) {
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pr_err("crashkernel allocation failed\n");
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goto disable;
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}
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} else {
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ret = memblock_reserve(crashk_res.start, crash_size);
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if (unlikely(ret < 0)) {
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pr_err("crashkernel reservation failed - "
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"memory is in use\n");
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goto disable;
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}
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}
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crashk_res.end = crashk_res.start + crash_size - 1;
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/*
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* Crash kernel trumps memory limit
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*/
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if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
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memory_limit = 0;
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pr_info("Disabled memory limit for crashkernel\n");
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}
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pr_info("Reserving %ldMB of memory at 0x%08lx "
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"for crashkernel (System RAM: %ldMB)\n",
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(unsigned long)(crash_size >> 20),
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(unsigned long)(crashk_res.start),
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(unsigned long)(memblock_phys_mem_size() >> 20));
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return;
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disable:
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crashk_res.start = crashk_res.end = 0;
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}
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