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282 lines
7.3 KiB
282 lines
7.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Code to handle transition of Linux booting another kernel. |
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* |
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* Copyright (C) 2002-2003 Eric Biederman <[email protected]> |
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz |
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* Copyright (C) 2005 IBM Corporation. |
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*/ |
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#include <linux/kexec.h> |
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#include <linux/reboot.h> |
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#include <linux/threads.h> |
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#include <linux/memblock.h> |
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#include <linux/of.h> |
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#include <linux/irq.h> |
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#include <linux/ftrace.h> |
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#include <asm/kdump.h> |
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#include <asm/machdep.h> |
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#include <asm/pgalloc.h> |
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#include <asm/prom.h> |
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#include <asm/sections.h> |
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void machine_kexec_mask_interrupts(void) { |
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unsigned int i; |
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struct irq_desc *desc; |
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for_each_irq_desc(i, desc) { |
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struct irq_chip *chip; |
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chip = irq_desc_get_chip(desc); |
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if (!chip) |
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continue; |
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if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) |
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chip->irq_eoi(&desc->irq_data); |
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if (chip->irq_mask) |
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chip->irq_mask(&desc->irq_data); |
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if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) |
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chip->irq_disable(&desc->irq_data); |
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} |
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} |
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void machine_crash_shutdown(struct pt_regs *regs) |
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{ |
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default_machine_crash_shutdown(regs); |
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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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if (ppc_md.machine_kexec_prepare) |
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return ppc_md.machine_kexec_prepare(image); |
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else |
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return default_machine_kexec_prepare(image); |
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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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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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#ifndef CONFIG_NUMA |
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VMCOREINFO_SYMBOL(contig_page_data); |
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#endif |
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#if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP) |
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VMCOREINFO_SYMBOL(vmemmap_list); |
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VMCOREINFO_SYMBOL(mmu_vmemmap_psize); |
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VMCOREINFO_SYMBOL(mmu_psize_defs); |
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VMCOREINFO_STRUCT_SIZE(vmemmap_backing); |
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VMCOREINFO_OFFSET(vmemmap_backing, list); |
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VMCOREINFO_OFFSET(vmemmap_backing, phys); |
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VMCOREINFO_OFFSET(vmemmap_backing, virt_addr); |
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VMCOREINFO_STRUCT_SIZE(mmu_psize_def); |
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VMCOREINFO_OFFSET(mmu_psize_def, shift); |
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#endif |
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vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset()); |
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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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int save_ftrace_enabled; |
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save_ftrace_enabled = __ftrace_enabled_save(); |
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this_cpu_disable_ftrace(); |
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if (ppc_md.machine_kexec) |
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ppc_md.machine_kexec(image); |
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else |
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default_machine_kexec(image); |
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this_cpu_enable_ftrace(); |
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__ftrace_enabled_restore(save_ftrace_enabled); |
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/* Fall back to normal restart if we're still alive. */ |
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machine_restart(NULL); |
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for(;;); |
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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, total_mem_sz; |
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int ret; |
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total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size(); |
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/* use common parsing */ |
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ret = parse_crashkernel(boot_command_line, total_mem_sz, |
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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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crashk_res.start = crashk_res.end = 0; |
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return; |
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} |
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/* We might have got these values via the command line or the |
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* device tree, either way sanitise them now. */ |
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crash_size = resource_size(&crashk_res); |
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#ifndef CONFIG_NONSTATIC_KERNEL |
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if (crashk_res.start != KDUMP_KERNELBASE) |
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printk("Crash kernel location must be 0x%x\n", |
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KDUMP_KERNELBASE); |
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crashk_res.start = KDUMP_KERNELBASE; |
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#else |
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if (!crashk_res.start) { |
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#ifdef CONFIG_PPC64 |
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/* |
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* On 64bit we split the RMO in half but cap it at half of |
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* a small SLB (128MB) since the crash kernel needs to place |
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* itself and some stacks to be in the first segment. |
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*/ |
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crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2)); |
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#else |
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crashk_res.start = KDUMP_KERNELBASE; |
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#endif |
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} |
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crash_base = PAGE_ALIGN(crashk_res.start); |
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if (crash_base != crashk_res.start) { |
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printk("Crash kernel base must be aligned to 0x%lx\n", |
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PAGE_SIZE); |
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crashk_res.start = crash_base; |
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} |
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#endif |
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crash_size = PAGE_ALIGN(crash_size); |
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crashk_res.end = crashk_res.start + crash_size - 1; |
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/* The crash region must not overlap the current kernel */ |
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if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { |
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printk(KERN_WARNING |
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"Crash kernel can not overlap current kernel\n"); |
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crashk_res.start = crashk_res.end = 0; |
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return; |
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} |
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/* Crash kernel trumps memory limit */ |
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if (memory_limit && memory_limit <= crashk_res.end) { |
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memory_limit = crashk_res.end + 1; |
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total_mem_sz = memory_limit; |
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printk("Adjusted memory limit for crashkernel, now 0x%llx\n", |
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memory_limit); |
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} |
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printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
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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 >> 20), |
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(unsigned long)(total_mem_sz >> 20)); |
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if (!memblock_is_region_memory(crashk_res.start, crash_size) || |
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memblock_reserve(crashk_res.start, crash_size)) { |
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pr_err("Failed to reserve memory for crashkernel!\n"); |
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crashk_res.start = crashk_res.end = 0; |
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return; |
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} |
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} |
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int overlaps_crashkernel(unsigned long start, unsigned long size) |
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{ |
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return (start + size) > crashk_res.start && start <= crashk_res.end; |
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} |
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/* Values we need to export to the second kernel via the device tree. */ |
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static phys_addr_t kernel_end; |
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static phys_addr_t crashk_base; |
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static phys_addr_t crashk_size; |
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static unsigned long long mem_limit; |
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static struct property kernel_end_prop = { |
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.name = "linux,kernel-end", |
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.length = sizeof(phys_addr_t), |
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.value = &kernel_end, |
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}; |
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static struct property crashk_base_prop = { |
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.name = "linux,crashkernel-base", |
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.length = sizeof(phys_addr_t), |
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.value = &crashk_base |
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}; |
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static struct property crashk_size_prop = { |
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.name = "linux,crashkernel-size", |
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.length = sizeof(phys_addr_t), |
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.value = &crashk_size, |
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}; |
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static struct property memory_limit_prop = { |
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.name = "linux,memory-limit", |
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.length = sizeof(unsigned long long), |
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.value = &mem_limit, |
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}; |
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#define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG) |
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static void __init export_crashk_values(struct device_node *node) |
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{ |
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/* There might be existing crash kernel properties, but we can't |
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* be sure what's in them, so remove them. */ |
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of_remove_property(node, of_find_property(node, |
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"linux,crashkernel-base", NULL)); |
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of_remove_property(node, of_find_property(node, |
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"linux,crashkernel-size", NULL)); |
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if (crashk_res.start != 0) { |
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crashk_base = cpu_to_be_ulong(crashk_res.start), |
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of_add_property(node, &crashk_base_prop); |
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crashk_size = cpu_to_be_ulong(resource_size(&crashk_res)); |
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of_add_property(node, &crashk_size_prop); |
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} |
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/* |
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* memory_limit is required by the kexec-tools to limit the |
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* crash regions to the actual memory used. |
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*/ |
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mem_limit = cpu_to_be_ulong(memory_limit); |
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of_update_property(node, &memory_limit_prop); |
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} |
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static int __init kexec_setup(void) |
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{ |
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struct device_node *node; |
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node = of_find_node_by_path("/chosen"); |
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if (!node) |
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return -ENOENT; |
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/* remove any stale properties so ours can be found */ |
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of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL)); |
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/* information needed by userspace when using default_machine_kexec */ |
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kernel_end = cpu_to_be_ulong(__pa(_end)); |
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of_add_property(node, &kernel_end_prop); |
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export_crashk_values(node); |
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of_node_put(node); |
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return 0; |
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} |
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late_initcall(kexec_setup);
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