Differential D18322 Diff 52562 head/sys/kern/subr_smp.c

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head/sys/kern/subr_smp.c

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	int smp_disabled = 0; /* has smp been disabled? */			int smp_disabled = 0; /* has smp been disabled? */
	SYSCTL_INT(_kern_smp, OID_AUTO, disabled, CTLFLAG_RDTUN\|CTLFLAG_CAPRD,			SYSCTL_INT(_kern_smp, OID_AUTO, disabled, CTLFLAG_RDTUN\|CTLFLAG_CAPRD,
	&smp_disabled, 0, "SMP has been disabled from the loader");			&smp_disabled, 0, "SMP has been disabled from the loader");

	int smp_cpus = 1; /* how many cpu's running */			int smp_cpus = 1; /* how many cpu's running */
	SYSCTL_INT(_kern_smp, OID_AUTO, cpus, CTLFLAG_RD\|CTLFLAG_CAPRD, &smp_cpus, 0,			SYSCTL_INT(_kern_smp, OID_AUTO, cpus, CTLFLAG_RD\|CTLFLAG_CAPRD, &smp_cpus, 0,
	"Number of CPUs online");			"Number of CPUs online");

				int smp_threads_per_core = 1; /* how many SMT threads are running per core */
				SYSCTL_INT(_kern_smp, OID_AUTO, threads_per_core, CTLFLAG_RD\|CTLFLAG_CAPRD,
				&smp_threads_per_core, 0, "Number of SMT threads online per core");

				int mp_ncores = -1; /* how many physical cores running */
				SYSCTL_INT(_kern_smp, OID_AUTO, cores, CTLFLAG_RD\|CTLFLAG_CAPRD, &mp_ncores, 0,
				"Number of CPUs online");

	int smp_topology = 0; /* Which topology we're using. */			int smp_topology = 0; /* Which topology we're using. */
	SYSCTL_INT(_kern_smp, OID_AUTO, topology, CTLFLAG_RDTUN, &smp_topology, 0,			SYSCTL_INT(_kern_smp, OID_AUTO, topology, CTLFLAG_RDTUN, &smp_topology, 0,
	"Topology override setting; 0 is default provided by hardware.");			"Topology override setting; 0 is default provided by hardware.");

	#ifdef SMP			#ifdef SMP
	/* Enable forwarding of a signal to a process running on a different CPU */			/* Enable forwarding of a signal to a process running on a different CPU */
	static int forward_signal_enabled = 1;			static int forward_signal_enabled = 1;
	SYSCTL_INT(_kern_smp, OID_AUTO, forward_signal_enabled, CTLFLAG_RW,			SYSCTL_INT(_kern_smp, OID_AUTO, forward_signal_enabled, CTLFLAG_RW,
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	static void			static void
	mp_start(void *dummy)			mp_start(void *dummy)
	{			{

	mtx_init(&smp_ipi_mtx, "smp rendezvous", NULL, MTX_SPIN);			mtx_init(&smp_ipi_mtx, "smp rendezvous", NULL, MTX_SPIN);

	/* Probe for MP hardware. */			/* Probe for MP hardware. */
	if (smp_disabled != 0 \|\| cpu_mp_probe() == 0) {			if (smp_disabled != 0 \|\| cpu_mp_probe() == 0) {
				mp_ncores = 1;
	mp_ncpus = 1;			mp_ncpus = 1;
	CPU_SETOF(PCPU_GET(cpuid), &all_cpus);			CPU_SETOF(PCPU_GET(cpuid), &all_cpus);
	return;			return;
	}			}

	cpu_mp_start();			cpu_mp_start();
	printf("FreeBSD/SMP: Multiprocessor System Detected: %d CPUs\n",			printf("FreeBSD/SMP: Multiprocessor System Detected: %d CPUs\n",
	mp_ncpus);			mp_ncpus);

				/* Provide a default for most architectures that don't have SMT/HTT. */
				if (mp_ncores < 0)
				mp_ncores = mp_ncpus;

	cpu_mp_announce();			cpu_mp_announce();
	}			}
	SYSINIT(cpu_mp, SI_SUB_CPU, SI_ORDER_THIRD, mp_start, NULL);			SYSINIT(cpu_mp, SI_SUB_CPU, SI_ORDER_THIRD, mp_start, NULL);

	void			void
	forward_signal(struct thread *td)			forward_signal(struct thread *td)
	{			{
	int id;			int id;
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	/*			/*
	* Provide dummy SMP support for UP kernels. Modules that need to use SMP			* Provide dummy SMP support for UP kernels. Modules that need to use SMP
	* APIs will still work using this dummy support.			* APIs will still work using this dummy support.
	*/			*/
	static void			static void
	mp_setvariables_for_up(void *dummy)			mp_setvariables_for_up(void *dummy)
	{			{
	mp_ncpus = 1;			mp_ncpus = 1;
				mp_ncores = 1;
	mp_maxid = PCPU_GET(cpuid);			mp_maxid = PCPU_GET(cpuid);
	CPU_SETOF(mp_maxid, &all_cpus);			CPU_SETOF(mp_maxid, &all_cpus);
	KASSERT(PCPU_GET(cpuid) == 0, ("UP must have a CPU ID of zero"));			KASSERT(PCPU_GET(cpuid) == 0, ("UP must have a CPU ID of zero"));
	}			}
	SYSINIT(cpu_mp_setvariables, SI_SUB_TUNABLES, SI_ORDER_FIRST,			SYSINIT(cpu_mp_setvariables, SI_SUB_TUNABLES, SI_ORDER_FIRST,
	mp_setvariables_for_up, NULL);			mp_setvariables_for_up, NULL);
	#endif /* SMP */			#endif /* SMP */

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