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193 lines
4.7 KiB
193 lines
4.7 KiB
// 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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*/ |
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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/io.h> |
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#include <linux/irq.h> |
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#include <linux/memblock.h> |
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#include <linux/of_fdt.h> |
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#include <asm/mmu_context.h> |
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#include <asm/cacheflush.h> |
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#include <asm/kexec-internal.h> |
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#include <asm/fncpy.h> |
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#include <asm/mach-types.h> |
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#include <asm/smp_plat.h> |
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#include <asm/system_misc.h> |
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#include <asm/set_memory.h> |
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extern void relocate_new_kernel(void); |
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extern const unsigned int relocate_new_kernel_size; |
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static atomic_t waiting_for_crash_ipi; |
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/* |
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* Provide a dummy crash_notes definition while crash dump arrives to arm. |
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* This prevents breakage of crash_notes attribute in kernel/ksysfs.c. |
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*/ |
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int machine_kexec_prepare(struct kimage *image) |
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{ |
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struct kexec_segment *current_segment; |
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__be32 header; |
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int i, err; |
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image->arch.kernel_r2 = image->start - KEXEC_ARM_ZIMAGE_OFFSET |
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+ KEXEC_ARM_ATAGS_OFFSET; |
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/* |
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* Validate that if the current HW supports SMP, then the SW supports |
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* and implements CPU hotplug for the current HW. If not, we won't be |
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* able to kexec reliably, so fail the prepare operation. |
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*/ |
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if (num_possible_cpus() > 1 && platform_can_secondary_boot() && |
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!platform_can_cpu_hotplug()) |
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return -EINVAL; |
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/* |
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* No segment at default ATAGs address. try to locate |
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* a dtb using magic. |
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*/ |
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for (i = 0; i < image->nr_segments; i++) { |
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current_segment = &image->segment[i]; |
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if (!memblock_is_region_memory(idmap_to_phys(current_segment->mem), |
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current_segment->memsz)) |
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return -EINVAL; |
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err = get_user(header, (__be32*)current_segment->buf); |
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if (err) |
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return err; |
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if (header == cpu_to_be32(OF_DT_HEADER)) |
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image->arch.kernel_r2 = current_segment->mem; |
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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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void machine_crash_nonpanic_core(void *unused) |
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{ |
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struct pt_regs regs; |
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crash_setup_regs(®s, get_irq_regs()); |
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printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n", |
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smp_processor_id()); |
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crash_save_cpu(®s, smp_processor_id()); |
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flush_cache_all(); |
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set_cpu_online(smp_processor_id(), false); |
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atomic_dec(&waiting_for_crash_ipi); |
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while (1) { |
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cpu_relax(); |
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wfe(); |
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} |
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} |
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void crash_smp_send_stop(void) |
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{ |
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static int cpus_stopped; |
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unsigned long msecs; |
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if (cpus_stopped) |
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return; |
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atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); |
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smp_call_function(machine_crash_nonpanic_core, NULL, false); |
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msecs = 1000; /* Wait at most a second for the other cpus to stop */ |
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while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { |
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mdelay(1); |
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msecs--; |
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} |
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if (atomic_read(&waiting_for_crash_ipi) > 0) |
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pr_warn("Non-crashing CPUs did not react to IPI\n"); |
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cpus_stopped = 1; |
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} |
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static void machine_kexec_mask_interrupts(void) |
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{ |
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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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local_irq_disable(); |
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crash_smp_send_stop(); |
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crash_save_cpu(regs, smp_processor_id()); |
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machine_kexec_mask_interrupts(); |
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pr_info("Loading crashdump kernel...\n"); |
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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, reboot_entry_phys; |
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struct kexec_relocate_data *data; |
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void (*reboot_entry)(void); |
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void *reboot_code_buffer; |
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/* |
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* This can only happen if machine_shutdown() failed to disable some |
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* CPU, and that can only happen if the checks in |
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* machine_kexec_prepare() were not correct. If this fails, we can't |
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* reliably kexec anyway, so BUG_ON is appropriate. |
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*/ |
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BUG_ON(num_online_cpus() > 1); |
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page_list = image->head & PAGE_MASK; |
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reboot_code_buffer = page_address(image->control_code_page); |
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/* copy our kernel relocation code to the control code page */ |
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reboot_entry = fncpy(reboot_code_buffer, |
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&relocate_new_kernel, |
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relocate_new_kernel_size); |
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data = reboot_code_buffer + relocate_new_kernel_size; |
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data->kexec_start_address = image->start; |
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data->kexec_indirection_page = page_list; |
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data->kexec_mach_type = machine_arch_type; |
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data->kexec_r2 = image->arch.kernel_r2; |
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/* get the identity mapping physical address for the reboot code */ |
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reboot_entry_phys = virt_to_idmap(reboot_entry); |
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pr_info("Bye!\n"); |
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soft_restart(reboot_entry_phys); |
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} |
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void arch_crash_save_vmcoreinfo(void) |
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{ |
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#ifdef CONFIG_ARM_LPAE |
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VMCOREINFO_CONFIG(ARM_LPAE); |
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#endif |
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}
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