9141a003a4
The kexec machine crash code can be called in interrupt context via a sysrq trigger made using the magic key combination. If the irq chip dealing with the serial interrupt is using the fasteoi flow handler, then we will never EOI the interrupt because the interrupt handler will be fatal. In the case of a GIC, this results in the crash kernel not receiving interrupts on that CPU interface. This patch adds code (based on the PowerPC implementation) to EOI any pending interrupts on the crash CPU before masking and disabling all interrupts. Secondary cores are not a problem since they are placed into a cpu_relax() loop via an IPI. Reported-by: Lei Wen <leiwen@marvell.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
/*
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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 <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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#include <asm/mach-types.h>
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#include <asm/system.h>
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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 unsigned long kexec_start_address;
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extern unsigned long kexec_indirection_page;
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extern unsigned long kexec_mach_type;
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extern unsigned long kexec_boot_atags;
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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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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, NULL);
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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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atomic_dec(&waiting_for_crash_ipi);
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while (1)
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cpu_relax();
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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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unsigned long msecs;
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local_irq_disable();
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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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printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
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crash_save_cpu(regs, smp_processor_id());
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machine_kexec_mask_interrupts();
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printk(KERN_INFO "Loading crashdump kernel...\n");
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}
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/*
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* Function pointer to optional machine-specific reinitialization
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*/
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void (*kexec_reinit)(void);
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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_phys;
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void *reboot_code_buffer;
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page_list = image->head & PAGE_MASK;
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/* we need both effective and real address here */
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reboot_code_buffer_phys =
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page_to_pfn(image->control_code_page) << PAGE_SHIFT;
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reboot_code_buffer = page_address(image->control_code_page);
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/* Prepare parameters for reboot_code_buffer*/
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kexec_start_address = image->start;
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kexec_indirection_page = page_list;
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kexec_mach_type = machine_arch_type;
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kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
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/* copy our kernel relocation code to the control code page */
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memcpy(reboot_code_buffer,
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relocate_new_kernel, relocate_new_kernel_size);
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flush_icache_range((unsigned long) reboot_code_buffer,
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(unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
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printk(KERN_INFO "Bye!\n");
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if (kexec_reinit)
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kexec_reinit();
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soft_restart(reboot_code_buffer_phys);
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}
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