From c6b5b847a7cf11f131c43fe0041443ec11697fc7 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 4 Dec 2006 15:40:33 +0100 Subject: [S390] cpu shutdown rework Let one master cpu kill all other cpus instead of sending an external interrupt to all other cpus so they can kill themselves. Simplifies reipl/shutdown functions a lot. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/machine_kexec.c | 65 ++++++++++------------------------------ 1 file changed, 16 insertions(+), 49 deletions(-) (limited to 'arch/s390/kernel/machine_kexec.c') diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index 202bf1fdfe3..def5caf8f72 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -1,15 +1,10 @@ /* * arch/s390/kernel/machine_kexec.c * - * (C) Copyright IBM Corp. 2005 + * Copyright IBM Corp. 2005,2006 * - * Author(s): Rolf Adelsberger - * - */ - -/* - * s390_machine_kexec.c - handle the transition of Linux booting another kernel - * on the S390 architecture. + * Author(s): Rolf Adelsberger, + * Heiko Carstens */ #include @@ -24,81 +19,53 @@ #include #include -static void kexec_halt_all_cpus(void *); - -typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long); +typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long); extern const unsigned char relocate_kernel[]; extern const unsigned long long relocate_kernel_len; -int -machine_kexec_prepare(struct kimage *image) +int machine_kexec_prepare(struct kimage *image) { - unsigned long reboot_code_buffer; + void *reboot_code_buffer; /* We don't support anything but the default image type for now. */ if (image->type != KEXEC_TYPE_DEFAULT) return -EINVAL; /* Get the destination where the assembler code should be copied to.*/ - reboot_code_buffer = page_to_pfn(image->control_code_page)<control_code_page); /* Then copy it */ - memcpy((void *) reboot_code_buffer, relocate_kernel, - relocate_kernel_len); + memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len); return 0; } -void -machine_kexec_cleanup(struct kimage *image) +void machine_kexec_cleanup(struct kimage *image) { } -void -machine_shutdown(void) +void machine_shutdown(void) { printk(KERN_INFO "kexec: machine_shutdown called\n"); } -NORET_TYPE void -machine_kexec(struct kimage *image) -{ - on_each_cpu(kexec_halt_all_cpus, image, 0, 0); - for (;;); -} - extern void pfault_fini(void); -static void -kexec_halt_all_cpus(void *kernel_image) +void machine_kexec(struct kimage *image) { - static atomic_t cpuid = ATOMIC_INIT(-1); - int cpu; - struct kimage *image; relocate_kernel_t data_mover; + preempt_disable(); #ifdef CONFIG_PFAULT if (MACHINE_IS_VM) pfault_fini(); #endif - - if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1) - signal_processor(smp_processor_id(), sigp_stop); - - /* Wait for all other cpus to enter stopped state */ - for_each_online_cpu(cpu) { - if (cpu == smp_processor_id()) - continue; - while (!smp_cpu_not_running(cpu)) - cpu_relax(); - } - + smp_send_stop(); s390_reset_system(); - image = (struct kimage *) kernel_image; - data_mover = (relocate_kernel_t) - (page_to_pfn(image->control_code_page) << PAGE_SHIFT); + data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page); /* Call the moving routine */ - (*data_mover) (&image->head, image->start); + (*data_mover)(&image->head, image->start); + for (;;); } -- cgit v1.2.3