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Based on 2 normalized pattern(s): this source code is licensed under the gnu general public license version 2 see the file copying for more details this source code is licensed under general public license version 2 see extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 52 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.449021192@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
264 lines
5.9 KiB
C
264 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* machine_kexec.c for kexec
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* Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
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*/
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#include <linux/compiler.h>
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#include <linux/kexec.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/libfdt.h>
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#include <asm/cacheflush.h>
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#include <asm/page.h>
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extern const unsigned char relocate_new_kernel[];
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extern const size_t 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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static unsigned long reboot_code_buffer;
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#ifdef CONFIG_SMP
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static void (*relocated_kexec_smp_wait)(void *);
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atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
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void (*_crash_smp_send_stop)(void) = NULL;
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#endif
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void (*_machine_kexec_shutdown)(void) = NULL;
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void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
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static void kexec_image_info(const struct kimage *kimage)
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{
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unsigned long i;
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pr_debug("kexec kimage info:\n");
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pr_debug(" type: %d\n", kimage->type);
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pr_debug(" start: %lx\n", kimage->start);
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pr_debug(" head: %lx\n", kimage->head);
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pr_debug(" nr_segments: %lu\n", kimage->nr_segments);
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for (i = 0; i < kimage->nr_segments; i++) {
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pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
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i,
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kimage->segment[i].mem,
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kimage->segment[i].mem + kimage->segment[i].memsz,
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(unsigned long)kimage->segment[i].memsz,
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(unsigned long)kimage->segment[i].memsz / PAGE_SIZE);
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}
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}
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#ifdef CONFIG_UHI_BOOT
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static int uhi_machine_kexec_prepare(struct kimage *kimage)
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{
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int i;
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/*
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* In case DTB file is not passed to the new kernel, a flat device
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* tree will be created by kexec tool. It holds modified command
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* line for the new kernel.
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*/
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for (i = 0; i < kimage->nr_segments; i++) {
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struct fdt_header fdt;
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if (kimage->segment[i].memsz <= sizeof(fdt))
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continue;
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if (copy_from_user(&fdt, kimage->segment[i].buf, sizeof(fdt)))
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continue;
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if (fdt_check_header(&fdt))
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continue;
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kexec_args[0] = -2;
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kexec_args[1] = (unsigned long)
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phys_to_virt((unsigned long)kimage->segment[i].mem);
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break;
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}
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return 0;
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}
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int (*_machine_kexec_prepare)(struct kimage *) = uhi_machine_kexec_prepare;
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#else
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int (*_machine_kexec_prepare)(struct kimage *) = NULL;
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#endif /* CONFIG_UHI_BOOT */
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int
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machine_kexec_prepare(struct kimage *kimage)
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{
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#ifdef CONFIG_SMP
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if (!kexec_nonboot_cpu_func())
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return -EINVAL;
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#endif
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kexec_image_info(kimage);
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if (_machine_kexec_prepare)
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return _machine_kexec_prepare(kimage);
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return 0;
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}
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void
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machine_kexec_cleanup(struct kimage *kimage)
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{
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}
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#ifdef CONFIG_SMP
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static void kexec_shutdown_secondary(void *param)
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{
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int cpu = smp_processor_id();
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if (!cpu_online(cpu))
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return;
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/* We won't be sent IPIs any more. */
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set_cpu_online(cpu, false);
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local_irq_disable();
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while (!atomic_read(&kexec_ready_to_reboot))
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cpu_relax();
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kexec_reboot();
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/* NOTREACHED */
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}
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#endif
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void
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machine_shutdown(void)
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{
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if (_machine_kexec_shutdown)
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_machine_kexec_shutdown();
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#ifdef CONFIG_SMP
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smp_call_function(kexec_shutdown_secondary, NULL, 0);
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while (num_online_cpus() > 1) {
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cpu_relax();
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mdelay(1);
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}
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#endif
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}
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void
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machine_crash_shutdown(struct pt_regs *regs)
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{
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if (_machine_crash_shutdown)
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_machine_crash_shutdown(regs);
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else
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default_machine_crash_shutdown(regs);
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}
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#ifdef CONFIG_SMP
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void kexec_nonboot_cpu_jump(void)
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{
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local_flush_icache_range((unsigned long)relocated_kexec_smp_wait,
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reboot_code_buffer + relocate_new_kernel_size);
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relocated_kexec_smp_wait(NULL);
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}
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#endif
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void kexec_reboot(void)
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{
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void (*do_kexec)(void) __noreturn;
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/*
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* We know we were online, and there will be no incoming IPIs at
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* this point. Mark online again before rebooting so that the crash
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* analysis tool will see us correctly.
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*/
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set_cpu_online(smp_processor_id(), true);
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/* Ensure remote CPUs observe that we're online before rebooting. */
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smp_mb__after_atomic();
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#ifdef CONFIG_SMP
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if (smp_processor_id() > 0) {
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/*
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* Instead of cpu_relax() or wait, this is needed for kexec
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* smp reboot. Kdump usually doesn't require an smp new
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* kernel, but kexec may do.
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*/
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kexec_nonboot_cpu();
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/* NOTREACHED */
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}
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#endif
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/*
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* Make sure we get correct instructions written by the
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* machine_kexec() CPU.
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*/
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local_flush_icache_range(reboot_code_buffer,
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reboot_code_buffer + relocate_new_kernel_size);
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do_kexec = (void *)reboot_code_buffer;
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do_kexec();
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}
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void
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machine_kexec(struct kimage *image)
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{
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unsigned long entry;
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unsigned long *ptr;
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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kexec_start_address =
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(unsigned long) phys_to_virt(image->start);
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if (image->type == KEXEC_TYPE_DEFAULT) {
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kexec_indirection_page =
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(unsigned long) phys_to_virt(image->head & PAGE_MASK);
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} else {
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kexec_indirection_page = (unsigned long)&image->head;
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}
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memcpy((void*)reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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/*
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* The generic kexec code builds a page list with physical
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* addresses. they are directly accessible through KSEG0 (or
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* CKSEG0 or XPHYS if on 64bit system), hence the
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* phys_to_virt() call.
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*/
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for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
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ptr = (entry & IND_INDIRECTION) ?
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phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
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if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
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*ptr & IND_DESTINATION)
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*ptr = (unsigned long) phys_to_virt(*ptr);
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}
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/* Mark offline BEFORE disabling local irq. */
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set_cpu_online(smp_processor_id(), false);
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/*
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* we do not want to be bothered.
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*/
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local_irq_disable();
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printk("Will call new kernel at %08lx\n", image->start);
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printk("Bye ...\n");
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/* Make reboot code buffer available to the boot CPU. */
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__flush_cache_all();
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#ifdef CONFIG_SMP
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/* All secondary cpus now may jump to kexec_wait cycle */
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relocated_kexec_smp_wait = reboot_code_buffer +
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(void *)(kexec_smp_wait - relocate_new_kernel);
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smp_wmb();
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atomic_set(&kexec_ready_to_reboot, 1);
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#endif
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kexec_reboot();
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}
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