mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 11:46:47 +07:00
0719392a61
Provide kexec with the boot view of memory by overriding the normal kexec translation functions added in a previous patch. We also need to fix a call to memblock in machine_kexec_prepare() so that we provide it with a running-view physical address rather than a boot- view physical address. Link: http://lkml.kernel.org/r/E1b8koa-0004Hl-Ey@rmk-PC.armlinux.org.uk Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Keerthy <j-keerthy@ti.com> Cc: Pratyush Anand <panand@redhat.com> Cc: Vitaly Andrianov <vitalya@ti.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Dave Young <dyoung@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Simon Horman <horms@verge.net.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
192 lines
4.7 KiB
C
192 lines
4.7 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 <linux/memblock.h>
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#include <asm/pgtable.h>
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#include <linux/of_fdt.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/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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extern void relocate_new_kernel(void);
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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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static unsigned long dt_mem;
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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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/*
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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 (be32_to_cpu(header) == OF_DT_HEADER)
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dt_mem = 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, 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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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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}
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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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pr_warn("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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pr_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, reboot_entry_phys;
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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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/* Prepare parameters for reboot_code_buffer*/
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set_kernel_text_rw();
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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 = dt_mem ?: image->start - KEXEC_ARM_ZIMAGE_OFFSET
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+ KEXEC_ARM_ATAGS_OFFSET;
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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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/* 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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if (kexec_reinit)
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kexec_reinit();
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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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