| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Code to handle transition of Linux booting another kernel. |
| * |
| * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> |
| * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz |
| * Copyright (C) 2005 IBM Corporation. |
| */ |
| |
| #include <linux/kexec.h> |
| #include <linux/reboot.h> |
| #include <linux/threads.h> |
| #include <linux/memblock.h> |
| #include <linux/of.h> |
| #include <linux/irq.h> |
| #include <linux/ftrace.h> |
| |
| #include <asm/kdump.h> |
| #include <asm/machdep.h> |
| #include <asm/pgalloc.h> |
| #include <asm/prom.h> |
| #include <asm/sections.h> |
| |
| void machine_kexec_mask_interrupts(void) { |
| unsigned int i; |
| struct irq_desc *desc; |
| |
| for_each_irq_desc(i, desc) { |
| struct irq_chip *chip; |
| |
| chip = irq_desc_get_chip(desc); |
| if (!chip) |
| continue; |
| |
| if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) |
| chip->irq_eoi(&desc->irq_data); |
| |
| if (chip->irq_mask) |
| chip->irq_mask(&desc->irq_data); |
| |
| if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) |
| chip->irq_disable(&desc->irq_data); |
| } |
| } |
| |
| void machine_crash_shutdown(struct pt_regs *regs) |
| { |
| default_machine_crash_shutdown(regs); |
| } |
| |
| /* |
| * Do what every setup is needed on image and the |
| * reboot code buffer to allow us to avoid allocations |
| * later. |
| */ |
| int machine_kexec_prepare(struct kimage *image) |
| { |
| if (ppc_md.machine_kexec_prepare) |
| return ppc_md.machine_kexec_prepare(image); |
| else |
| return default_machine_kexec_prepare(image); |
| } |
| |
| void machine_kexec_cleanup(struct kimage *image) |
| { |
| } |
| |
| void arch_crash_save_vmcoreinfo(void) |
| { |
| |
| #ifdef CONFIG_NUMA |
| VMCOREINFO_SYMBOL(node_data); |
| VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); |
| #endif |
| #ifndef CONFIG_NUMA |
| VMCOREINFO_SYMBOL(contig_page_data); |
| #endif |
| #if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP) |
| VMCOREINFO_SYMBOL(vmemmap_list); |
| VMCOREINFO_SYMBOL(mmu_vmemmap_psize); |
| VMCOREINFO_SYMBOL(mmu_psize_defs); |
| VMCOREINFO_STRUCT_SIZE(vmemmap_backing); |
| VMCOREINFO_OFFSET(vmemmap_backing, list); |
| VMCOREINFO_OFFSET(vmemmap_backing, phys); |
| VMCOREINFO_OFFSET(vmemmap_backing, virt_addr); |
| VMCOREINFO_STRUCT_SIZE(mmu_psize_def); |
| VMCOREINFO_OFFSET(mmu_psize_def, shift); |
| #endif |
| vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset()); |
| } |
| |
| /* |
| * Do not allocate memory (or fail in any way) in machine_kexec(). |
| * We are past the point of no return, committed to rebooting now. |
| */ |
| void machine_kexec(struct kimage *image) |
| { |
| int save_ftrace_enabled; |
| |
| save_ftrace_enabled = __ftrace_enabled_save(); |
| this_cpu_disable_ftrace(); |
| |
| if (ppc_md.machine_kexec) |
| ppc_md.machine_kexec(image); |
| else |
| default_machine_kexec(image); |
| |
| this_cpu_enable_ftrace(); |
| __ftrace_enabled_restore(save_ftrace_enabled); |
| |
| /* Fall back to normal restart if we're still alive. */ |
| machine_restart(NULL); |
| for(;;); |
| } |
| |
| void __init reserve_crashkernel(void) |
| { |
| unsigned long long crash_size, crash_base, total_mem_sz; |
| int ret; |
| |
| total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size(); |
| /* use common parsing */ |
| ret = parse_crashkernel(boot_command_line, total_mem_sz, |
| &crash_size, &crash_base); |
| if (ret == 0 && crash_size > 0) { |
| crashk_res.start = crash_base; |
| crashk_res.end = crash_base + crash_size - 1; |
| } |
| |
| if (crashk_res.end == crashk_res.start) { |
| crashk_res.start = crashk_res.end = 0; |
| return; |
| } |
| |
| /* We might have got these values via the command line or the |
| * device tree, either way sanitise them now. */ |
| |
| crash_size = resource_size(&crashk_res); |
| |
| #ifndef CONFIG_NONSTATIC_KERNEL |
| if (crashk_res.start != KDUMP_KERNELBASE) |
| printk("Crash kernel location must be 0x%x\n", |
| KDUMP_KERNELBASE); |
| |
| crashk_res.start = KDUMP_KERNELBASE; |
| #else |
| if (!crashk_res.start) { |
| #ifdef CONFIG_PPC64 |
| /* |
| * On the LPAR platform place the crash kernel to mid of |
| * RMA size (512MB or more) to ensure the crash kernel |
| * gets enough space to place itself and some stack to be |
| * in the first segment. At the same time normal kernel |
| * also get enough space to allocate memory for essential |
| * system resource in the first segment. Keep the crash |
| * kernel starts at 128MB offset on other platforms. |
| */ |
| if (firmware_has_feature(FW_FEATURE_LPAR)) |
| crashk_res.start = ppc64_rma_size / 2; |
| else |
| crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2)); |
| #else |
| crashk_res.start = KDUMP_KERNELBASE; |
| #endif |
| } |
| |
| crash_base = PAGE_ALIGN(crashk_res.start); |
| if (crash_base != crashk_res.start) { |
| printk("Crash kernel base must be aligned to 0x%lx\n", |
| PAGE_SIZE); |
| crashk_res.start = crash_base; |
| } |
| |
| #endif |
| crash_size = PAGE_ALIGN(crash_size); |
| crashk_res.end = crashk_res.start + crash_size - 1; |
| |
| /* The crash region must not overlap the current kernel */ |
| if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { |
| printk(KERN_WARNING |
| "Crash kernel can not overlap current kernel\n"); |
| crashk_res.start = crashk_res.end = 0; |
| return; |
| } |
| |
| /* Crash kernel trumps memory limit */ |
| if (memory_limit && memory_limit <= crashk_res.end) { |
| memory_limit = crashk_res.end + 1; |
| total_mem_sz = memory_limit; |
| printk("Adjusted memory limit for crashkernel, now 0x%llx\n", |
| memory_limit); |
| } |
| |
| printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
| "for crashkernel (System RAM: %ldMB)\n", |
| (unsigned long)(crash_size >> 20), |
| (unsigned long)(crashk_res.start >> 20), |
| (unsigned long)(total_mem_sz >> 20)); |
| |
| if (!memblock_is_region_memory(crashk_res.start, crash_size) || |
| memblock_reserve(crashk_res.start, crash_size)) { |
| pr_err("Failed to reserve memory for crashkernel!\n"); |
| crashk_res.start = crashk_res.end = 0; |
| return; |
| } |
| } |
| |
| int overlaps_crashkernel(unsigned long start, unsigned long size) |
| { |
| return (start + size) > crashk_res.start && start <= crashk_res.end; |
| } |
| |
| /* Values we need to export to the second kernel via the device tree. */ |
| static phys_addr_t kernel_end; |
| static phys_addr_t crashk_base; |
| static phys_addr_t crashk_size; |
| static unsigned long long mem_limit; |
| |
| static struct property kernel_end_prop = { |
| .name = "linux,kernel-end", |
| .length = sizeof(phys_addr_t), |
| .value = &kernel_end, |
| }; |
| |
| static struct property crashk_base_prop = { |
| .name = "linux,crashkernel-base", |
| .length = sizeof(phys_addr_t), |
| .value = &crashk_base |
| }; |
| |
| static struct property crashk_size_prop = { |
| .name = "linux,crashkernel-size", |
| .length = sizeof(phys_addr_t), |
| .value = &crashk_size, |
| }; |
| |
| static struct property memory_limit_prop = { |
| .name = "linux,memory-limit", |
| .length = sizeof(unsigned long long), |
| .value = &mem_limit, |
| }; |
| |
| #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG) |
| |
| static void __init export_crashk_values(struct device_node *node) |
| { |
| /* There might be existing crash kernel properties, but we can't |
| * be sure what's in them, so remove them. */ |
| of_remove_property(node, of_find_property(node, |
| "linux,crashkernel-base", NULL)); |
| of_remove_property(node, of_find_property(node, |
| "linux,crashkernel-size", NULL)); |
| |
| if (crashk_res.start != 0) { |
| crashk_base = cpu_to_be_ulong(crashk_res.start), |
| of_add_property(node, &crashk_base_prop); |
| crashk_size = cpu_to_be_ulong(resource_size(&crashk_res)); |
| of_add_property(node, &crashk_size_prop); |
| } |
| |
| /* |
| * memory_limit is required by the kexec-tools to limit the |
| * crash regions to the actual memory used. |
| */ |
| mem_limit = cpu_to_be_ulong(memory_limit); |
| of_update_property(node, &memory_limit_prop); |
| } |
| |
| static int __init kexec_setup(void) |
| { |
| struct device_node *node; |
| |
| node = of_find_node_by_path("/chosen"); |
| if (!node) |
| return -ENOENT; |
| |
| /* remove any stale properties so ours can be found */ |
| of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL)); |
| |
| /* information needed by userspace when using default_machine_kexec */ |
| kernel_end = cpu_to_be_ulong(__pa(_end)); |
| of_add_property(node, &kernel_end_prop); |
| |
| export_crashk_values(node); |
| |
| of_node_put(node); |
| return 0; |
| } |
| late_initcall(kexec_setup); |