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has proven to have a good effect when entering KDB by using a NMI, but it completely violates all the good rules about interrupts disabled while holding a spinlock in other occasions. This can be the cause of deadlocks on events where a normal IPI_STOP is expected. * Adds an new IPI called IPI_STOP_HARD on all the supported architectures. This IPI is responsible for sending a stop message among CPUs using a privileged channel when disponible. In other cases it just does match a normal IPI_STOP. Right now the IPI_STOP_HARD functionality uses a NMI on ia32 and amd64 architectures, while on the other has a normal IPI_STOP effect. It is responsibility of maintainers to eventually implement an hard stop when necessary and possible. * Use the new IPI facility in order to implement a new userend SMP kernel function called stop_cpus_hard(). That is specular to stop_cpu() but it does use the privileged channel for the stopping facility. * Let KDB use the newly introduced function stop_cpus_hard() and leave stop_cpus() for all the other cases * Disable interrupts on CPU0 when starting the process of APs suspension. * Style cleanup and comments adding This patch should fix the reboot/shutdown deadlocks many users are constantly reporting on mailing lists. Please don't forget to update your config file with the STOP_NMI option removal Reviewed by: jhb Tested by: pho, bz, rink Approved by: re (kib)
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/*-
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* from: src/sys/alpha/include/smp.h,v 1.8 2005/01/05 20:05:50 imp
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* JNPR: smp.h,v 1.3 2006/12/02 09:53:41 katta
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* $FreeBSD$
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*
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*/
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#ifndef _MACHINE_SMP_H_
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#define _MACHINE_SMP_H_
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#ifdef _KERNEL
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/*
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* Interprocessor interrupts for SMP.
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*/
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#define IPI_INVLTLB 0x0001
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#define IPI_RENDEZVOUS 0x0002
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#define IPI_AST 0x0004
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#define IPI_STOP 0x0008
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#define IPI_STOP_HARD 0x0008
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#ifndef LOCORE
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extern u_int32_t boot_cpu_id;
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void ipi_selected(u_int cpus, u_int32_t ipi);
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void ipi_all_but_self(u_int32_t ipi);
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intrmask_t smp_handle_ipi(struct trapframe *frame);
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void smp_init_secondary(u_int32_t cpuid);
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void mips_ipi_send(int thread_id);
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#endif /* !LOCORE */
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#endif /* _KERNEL */
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#endif /* _MACHINE_SMP_H_ */
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