mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
338bac527e
This patch cleans up pci_iommu_shutdown() a bit to use x86_platform (similar to how IA64 initializes an IOMMU driver). This adds iommu_shutdown() to x86_platform to avoid calling every IOMMUs' shutdown functions in pci_iommu_shutdown() in order. The IOMMU shutdown functions are platform specific (we don't have multiple different IOMMU hardware) so the current way is pointless. An IOMMU driver sets x86_platform.iommu_shutdown to the shutdown function if necessary. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: joerg.roedel@amd.com LKML-Reference: <20091027163358F.fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/*
|
|
* Architecture specific (i386/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 <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/elfcore.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/hardirq.h>
|
|
#include <asm/nmi.h>
|
|
#include <asm/hw_irq.h>
|
|
#include <asm/apic.h>
|
|
#include <asm/hpet.h>
|
|
#include <linux/kdebug.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/reboot.h>
|
|
#include <asm/virtext.h>
|
|
#include <asm/x86_init.h>
|
|
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
|
|
|
|
static void kdump_nmi_callback(int cpu, struct die_args *args)
|
|
{
|
|
struct pt_regs *regs;
|
|
#ifdef CONFIG_X86_32
|
|
struct pt_regs fixed_regs;
|
|
#endif
|
|
|
|
regs = args->regs;
|
|
|
|
#ifdef CONFIG_X86_32
|
|
if (!user_mode_vm(regs)) {
|
|
crash_fixup_ss_esp(&fixed_regs, regs);
|
|
regs = &fixed_regs;
|
|
}
|
|
#endif
|
|
crash_save_cpu(regs, cpu);
|
|
|
|
/* Disable VMX or SVM if needed.
|
|
*
|
|
* We need to disable virtualization on all CPUs.
|
|
* Having VMX or SVM enabled on any CPU may break rebooting
|
|
* after the kdump kernel has finished its task.
|
|
*/
|
|
cpu_emergency_vmxoff();
|
|
cpu_emergency_svm_disable();
|
|
|
|
disable_local_APIC();
|
|
}
|
|
|
|
static void kdump_nmi_shootdown_cpus(void)
|
|
{
|
|
nmi_shootdown_cpus(kdump_nmi_callback);
|
|
|
|
disable_local_APIC();
|
|
}
|
|
|
|
#else
|
|
static void kdump_nmi_shootdown_cpus(void)
|
|
{
|
|
/* There are no cpus to shootdown */
|
|
}
|
|
#endif
|
|
|
|
void native_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();
|
|
|
|
kdump_nmi_shootdown_cpus();
|
|
|
|
/* Booting kdump kernel with VMX or SVM enabled won't work,
|
|
* because (among other limitations) we can't disable paging
|
|
* with the virt flags.
|
|
*/
|
|
cpu_emergency_vmxoff();
|
|
cpu_emergency_svm_disable();
|
|
|
|
lapic_shutdown();
|
|
#if defined(CONFIG_X86_IO_APIC)
|
|
disable_IO_APIC();
|
|
#endif
|
|
#ifdef CONFIG_HPET_TIMER
|
|
hpet_disable();
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
x86_platform.iommu_shutdown();
|
|
#endif
|
|
|
|
crash_save_cpu(regs, safe_smp_processor_id());
|
|
}
|