From: Thomas Gleixner Date: Thu, 11 Oct 2007 09:14:19 +0000 (+0200) Subject: x86_64: prepare shared kernel/crash.c X-Git-Tag: firefly_0821_release~26214 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8b6f65ed7a216ff4591604ffe8d718981bad1224;p=firefly-linux-kernel-4.4.55.git x86_64: prepare shared kernel/crash.c Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile index c17099e70954..5ddd94b34b2c 100644 --- a/arch/x86_64/kernel/Makefile +++ b/arch/x86_64/kernel/Makefile @@ -23,7 +23,7 @@ obj-$(CONFIG_X86_CPUID) += cpuid.o obj-$(CONFIG_SMP) += smp_64.o smpboot.o trampoline.o tsc_sync.o obj-y += apic.o nmi.o obj-y += io_apic_64.o mpparse.o genapic.o genapic_flat.o -obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel_64.o crash.o +obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel_64.o crash_64.o obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_PM) += suspend.o obj-$(CONFIG_HIBERNATION) += suspend_asm.o diff --git a/arch/x86_64/kernel/crash.c b/arch/x86_64/kernel/crash.c deleted file mode 100644 index 13432a1ae904..000000000000 --- a/arch/x86_64/kernel/crash.c +++ /dev/null @@ -1,135 +0,0 @@ -/* - * Architecture specific (x86_64) functions for kexec based crash dumps. - * - * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) - * - * Copyright (C) IBM Corporation, 2004. All rights reserved. - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include - -/* This keeps a track of which one is crashing cpu. */ -static int crashing_cpu; - -#ifdef CONFIG_SMP -static atomic_t waiting_for_crash_ipi; - -static int crash_nmi_callback(struct notifier_block *self, - unsigned long val, void *data) -{ - struct pt_regs *regs; - int cpu; - - if (val != DIE_NMI_IPI) - return NOTIFY_OK; - - regs = ((struct die_args *)data)->regs; - cpu = raw_smp_processor_id(); - - /* - * Don't do anything if this handler is invoked on crashing cpu. - * Otherwise, system will completely hang. Crashing cpu can get - * an NMI if system was initially booted with nmi_watchdog parameter. - */ - if (cpu == crashing_cpu) - return NOTIFY_STOP; - local_irq_disable(); - - crash_save_cpu(regs, cpu); - disable_local_APIC(); - atomic_dec(&waiting_for_crash_ipi); - /* Assume hlt works */ - for(;;) - halt(); - - return 1; -} - -static void smp_send_nmi_allbutself(void) -{ - send_IPI_allbutself(NMI_VECTOR); -} - -/* - * This code is a best effort heuristic to get the - * other cpus to stop executing. So races with - * cpu hotplug shouldn't matter. - */ - -static struct notifier_block crash_nmi_nb = { - .notifier_call = crash_nmi_callback, -}; - -static void nmi_shootdown_cpus(void) -{ - unsigned long msecs; - - atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); - if (register_die_notifier(&crash_nmi_nb)) - return; /* return what? */ - - /* - * Ensure the new callback function is set before sending - * out the NMI - */ - wmb(); - - smp_send_nmi_allbutself(); - - msecs = 1000; /* Wait at most a second for the other cpus to stop */ - while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { - mdelay(1); - msecs--; - } - /* Leave the nmi callback set */ - disable_local_APIC(); -} -#else -static void nmi_shootdown_cpus(void) -{ - /* There are no cpus to shootdown */ -} -#endif - -void machine_crash_shutdown(struct pt_regs *regs) -{ - /* - * This function is only called after the system - * has panicked or is otherwise in a critical state. - * The minimum amount of code to allow a kexec'd kernel - * to run successfully needs to happen here. - * - * In practice this means shooting down the other cpus in - * an SMP system. - */ - /* The kernel is broken so disable interrupts */ - local_irq_disable(); - - /* Make a note of crashing cpu. Will be used in NMI callback.*/ - crashing_cpu = smp_processor_id(); - nmi_shootdown_cpus(); - - if(cpu_has_apic) - disable_local_APIC(); - - disable_IO_APIC(); - - crash_save_cpu(regs, smp_processor_id()); -} diff --git a/arch/x86_64/kernel/crash_64.c b/arch/x86_64/kernel/crash_64.c new file mode 100644 index 000000000000..13432a1ae904 --- /dev/null +++ b/arch/x86_64/kernel/crash_64.c @@ -0,0 +1,135 @@ +/* + * Architecture specific (x86_64) functions for kexec based crash dumps. + * + * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) + * + * Copyright (C) IBM Corporation, 2004. All rights reserved. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +/* This keeps a track of which one is crashing cpu. */ +static int crashing_cpu; + +#ifdef CONFIG_SMP +static atomic_t waiting_for_crash_ipi; + +static int crash_nmi_callback(struct notifier_block *self, + unsigned long val, void *data) +{ + struct pt_regs *regs; + int cpu; + + if (val != DIE_NMI_IPI) + return NOTIFY_OK; + + regs = ((struct die_args *)data)->regs; + cpu = raw_smp_processor_id(); + + /* + * Don't do anything if this handler is invoked on crashing cpu. + * Otherwise, system will completely hang. Crashing cpu can get + * an NMI if system was initially booted with nmi_watchdog parameter. + */ + if (cpu == crashing_cpu) + return NOTIFY_STOP; + local_irq_disable(); + + crash_save_cpu(regs, cpu); + disable_local_APIC(); + atomic_dec(&waiting_for_crash_ipi); + /* Assume hlt works */ + for(;;) + halt(); + + return 1; +} + +static void smp_send_nmi_allbutself(void) +{ + send_IPI_allbutself(NMI_VECTOR); +} + +/* + * This code is a best effort heuristic to get the + * other cpus to stop executing. So races with + * cpu hotplug shouldn't matter. + */ + +static struct notifier_block crash_nmi_nb = { + .notifier_call = crash_nmi_callback, +}; + +static void nmi_shootdown_cpus(void) +{ + unsigned long msecs; + + atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); + if (register_die_notifier(&crash_nmi_nb)) + return; /* return what? */ + + /* + * Ensure the new callback function is set before sending + * out the NMI + */ + wmb(); + + smp_send_nmi_allbutself(); + + msecs = 1000; /* Wait at most a second for the other cpus to stop */ + while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { + mdelay(1); + msecs--; + } + /* Leave the nmi callback set */ + disable_local_APIC(); +} +#else +static void nmi_shootdown_cpus(void) +{ + /* There are no cpus to shootdown */ +} +#endif + +void machine_crash_shutdown(struct pt_regs *regs) +{ + /* + * This function is only called after the system + * has panicked or is otherwise in a critical state. + * The minimum amount of code to allow a kexec'd kernel + * to run successfully needs to happen here. + * + * In practice this means shooting down the other cpus in + * an SMP system. + */ + /* The kernel is broken so disable interrupts */ + local_irq_disable(); + + /* Make a note of crashing cpu. Will be used in NMI callback.*/ + crashing_cpu = smp_processor_id(); + nmi_shootdown_cpus(); + + if(cpu_has_apic) + disable_local_APIC(); + + disable_IO_APIC(); + + crash_save_cpu(regs, smp_processor_id()); +}