Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757365AbYKET7w (ORCPT ); Wed, 5 Nov 2008 14:59:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756690AbYKET6I (ORCPT ); Wed, 5 Nov 2008 14:58:08 -0500 Received: from mx2.redhat.com ([66.187.237.31]:41409 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755847AbYKET6B (ORCPT ); Wed, 5 Nov 2008 14:58:01 -0500 From: Eduardo Habkost To: Avi Kivity , Ingo Molnar Cc: "Eric W. Biederman" , Simon Horman , Andrew Morton , Vivek Goyal , Haren Myneni , Andrey Borzenkov , mingo@redhat.com, "Rafael J. Wysocki" , kexec@lists.infradead.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Eduardo Habkost Subject: [PATCH 06/15] x86: Move nmi_shootdown_cpus() to reboot.c Date: Wed, 5 Nov 2008 17:56:49 -0200 Message-Id: <1225915018-6548-7-git-send-email-ehabkost@redhat.com> In-Reply-To: <1225915018-6548-1-git-send-email-ehabkost@redhat.com> References: <1225915018-6548-1-git-send-email-ehabkost@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5115 Lines: 202 Now nmi_shootdown_cpus() is ready to be used by non-kdump code also. Move it to reboot.c. Signed-off-by: Eduardo Habkost --- arch/x86/kernel/crash.c | 73 ------------------------------------------ arch/x86/kernel/reboot.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+), 73 deletions(-) diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c index bba0907..d84a852 100644 --- a/arch/x86/kernel/crash.c +++ b/arch/x86/kernel/crash.c @@ -32,12 +32,6 @@ #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) -/* This keeps a track of which one is crashing cpu. */ -static int crashing_cpu; -static nmi_shootdown_cb shootdown_callback; - -static atomic_t waiting_for_crash_ipi; - static void kdump_nmi_callback(int cpu, struct die_args *args) { struct pt_regs *regs; @@ -58,73 +52,6 @@ static void kdump_nmi_callback(int cpu, struct die_args *args) disable_local_APIC(); } -static int crash_nmi_callback(struct notifier_block *self, - unsigned long val, void *data) -{ - int cpu; - - if (val != DIE_NMI_IPI) - return NOTIFY_OK; - - 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(); - - shootdown_callback(cpu, (struct die_args *)data); - - atomic_dec(&waiting_for_crash_ipi); - /* Assume hlt works */ - halt(); - for (;;) - cpu_relax(); - - return 1; -} - -static void smp_send_nmi_allbutself(void) -{ - send_IPI_allbutself(NMI_VECTOR); -} - -static struct notifier_block crash_nmi_nb = { - .notifier_call = crash_nmi_callback, -}; - -void nmi_shootdown_cpus(nmi_shootdown_cb callback) -{ - unsigned long msecs; - - /* Make a note of crashing cpu. Will be used in NMI callback.*/ - crashing_cpu = safe_smp_processor_id(); - - shootdown_callback = callback; - - atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); - /* Would it be better to replace the trap vector here? */ - 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 */ -} - static void kdump_nmi_shootdown_cpus(void) { nmi_shootdown_cpus(kdump_nmi_callback); diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index f4c93f1..be29987 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -21,6 +21,8 @@ # include #endif +#include + /* * Power off function, if any */ @@ -518,3 +520,80 @@ void machine_crash_shutdown(struct pt_regs *regs) machine_ops.crash_shutdown(regs); } #endif + + +#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) + +/* This keeps a track of which one is crashing cpu. */ +static int crashing_cpu; +static nmi_shootdown_cb shootdown_callback; + +static atomic_t waiting_for_crash_ipi; + +static int crash_nmi_callback(struct notifier_block *self, + unsigned long val, void *data) +{ + int cpu; + + if (val != DIE_NMI_IPI) + return NOTIFY_OK; + + 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(); + + shootdown_callback(cpu, (struct die_args *)data); + + atomic_dec(&waiting_for_crash_ipi); + /* Assume hlt works */ + halt(); + for (;;) + cpu_relax(); + + return 1; +} + +static void smp_send_nmi_allbutself(void) +{ + send_IPI_allbutself(NMI_VECTOR); +} + +static struct notifier_block crash_nmi_nb = { + .notifier_call = crash_nmi_callback, +}; + +void nmi_shootdown_cpus(nmi_shootdown_cb callback) +{ + unsigned long msecs; + + /* Make a note of crashing cpu. Will be used in NMI callback.*/ + crashing_cpu = safe_smp_processor_id(); + + shootdown_callback = callback; + + atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); + /* Would it be better to replace the trap vector here? */ + 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 */ +} +#endif -- 1.5.5.GIT -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/