a8586beeb0
Reported by: pluknet
689 lines
17 KiB
C
689 lines
17 KiB
C
/*-
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* Copyright (c) 2001, John Baldwin <jhb@FreeBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* This module holds the global variables and machine independent functions
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* used for the kernel SMP support.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/proc.h>
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#include <sys/bus.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/pcpu.h>
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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#include <machine/cpu.h>
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#include <machine/smp.h>
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#include "opt_sched.h"
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#ifdef SMP
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volatile cpuset_t stopped_cpus;
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volatile cpuset_t started_cpus;
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cpuset_t hlt_cpus_mask;
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cpuset_t logical_cpus_mask;
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void (*cpustop_restartfunc)(void);
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#endif
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/* This is used in modules that need to work in both SMP and UP. */
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cpuset_t all_cpus;
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int mp_ncpus;
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/* export this for libkvm consumers. */
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int mp_maxcpus = MAXCPU;
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volatile int smp_started;
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u_int mp_maxid;
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SYSCTL_NODE(_kern, OID_AUTO, smp, CTLFLAG_RD, NULL, "Kernel SMP");
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SYSCTL_UINT(_kern_smp, OID_AUTO, maxid, CTLFLAG_RD, &mp_maxid, 0,
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"Max CPU ID.");
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SYSCTL_INT(_kern_smp, OID_AUTO, maxcpus, CTLFLAG_RD, &mp_maxcpus, 0,
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"Max number of CPUs that the system was compiled for.");
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int smp_active = 0; /* are the APs allowed to run? */
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SYSCTL_INT(_kern_smp, OID_AUTO, active, CTLFLAG_RW, &smp_active, 0,
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"Number of Auxillary Processors (APs) that were successfully started");
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int smp_disabled = 0; /* has smp been disabled? */
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SYSCTL_INT(_kern_smp, OID_AUTO, disabled, CTLFLAG_RDTUN, &smp_disabled, 0,
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"SMP has been disabled from the loader");
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TUNABLE_INT("kern.smp.disabled", &smp_disabled);
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int smp_cpus = 1; /* how many cpu's running */
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SYSCTL_INT(_kern_smp, OID_AUTO, cpus, CTLFLAG_RD, &smp_cpus, 0,
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"Number of CPUs online");
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int smp_topology = 0; /* Which topology we're using. */
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SYSCTL_INT(_kern_smp, OID_AUTO, topology, CTLFLAG_RD, &smp_topology, 0,
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"Topology override setting; 0 is default provided by hardware.");
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TUNABLE_INT("kern.smp.topology", &smp_topology);
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#ifdef SMP
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/* Enable forwarding of a signal to a process running on a different CPU */
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static int forward_signal_enabled = 1;
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SYSCTL_INT(_kern_smp, OID_AUTO, forward_signal_enabled, CTLFLAG_RW,
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&forward_signal_enabled, 0,
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"Forwarding of a signal to a process on a different CPU");
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/* Variables needed for SMP rendezvous. */
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static volatile int smp_rv_ncpus;
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static void (*volatile smp_rv_setup_func)(void *arg);
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static void (*volatile smp_rv_action_func)(void *arg);
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static void (*volatile smp_rv_teardown_func)(void *arg);
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static void *volatile smp_rv_func_arg;
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static volatile int smp_rv_waiters[3];
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static volatile int smp_rv_generation;
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/*
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* Shared mutex to restrict busywaits between smp_rendezvous() and
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* smp(_targeted)_tlb_shootdown(). A deadlock occurs if both of these
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* functions trigger at once and cause multiple CPUs to busywait with
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* interrupts disabled.
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*/
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struct mtx smp_ipi_mtx;
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/*
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* Let the MD SMP code initialize mp_maxid very early if it can.
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*/
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static void
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mp_setmaxid(void *dummy)
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{
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cpu_mp_setmaxid();
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}
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SYSINIT(cpu_mp_setmaxid, SI_SUB_TUNABLES, SI_ORDER_FIRST, mp_setmaxid, NULL);
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/*
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* Call the MD SMP initialization code.
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*/
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static void
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mp_start(void *dummy)
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{
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mtx_init(&smp_ipi_mtx, "smp rendezvous", NULL, MTX_SPIN);
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/* Probe for MP hardware. */
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if (smp_disabled != 0 || cpu_mp_probe() == 0) {
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mp_ncpus = 1;
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all_cpus = PCPU_GET(cpumask);
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return;
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}
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cpu_mp_start();
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printf("FreeBSD/SMP: Multiprocessor System Detected: %d CPUs\n",
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mp_ncpus);
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cpu_mp_announce();
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}
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SYSINIT(cpu_mp, SI_SUB_CPU, SI_ORDER_THIRD, mp_start, NULL);
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void
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forward_signal(struct thread *td)
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{
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int id;
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/*
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* signotify() has already set TDF_ASTPENDING and TDF_NEEDSIGCHECK on
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* this thread, so all we need to do is poke it if it is currently
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* executing so that it executes ast().
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*/
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THREAD_LOCK_ASSERT(td, MA_OWNED);
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KASSERT(TD_IS_RUNNING(td),
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("forward_signal: thread is not TDS_RUNNING"));
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CTR1(KTR_SMP, "forward_signal(%p)", td->td_proc);
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if (!smp_started || cold || panicstr)
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return;
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if (!forward_signal_enabled)
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return;
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/* No need to IPI ourself. */
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if (td == curthread)
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return;
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id = td->td_oncpu;
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if (id == NOCPU)
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return;
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ipi_cpu(id, IPI_AST);
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}
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/*
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* When called the executing CPU will send an IPI to all other CPUs
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* requesting that they halt execution.
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*
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* Usually (but not necessarily) called with 'other_cpus' as its arg.
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*
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* - Signals all CPUs in map to stop.
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* - Waits for each to stop.
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*
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* Returns:
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* -1: error
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* 0: NA
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* 1: ok
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*
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*/
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static int
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generic_stop_cpus(cpuset_t map, u_int type)
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{
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#ifdef KTR
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char cpusetbuf[CPUSETBUFSIZ];
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#endif
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static volatile u_int stopping_cpu = NOCPU;
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int i;
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KASSERT(
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#if defined(__amd64__)
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type == IPI_STOP || type == IPI_STOP_HARD || type == IPI_SUSPEND,
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#else
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type == IPI_STOP || type == IPI_STOP_HARD,
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#endif
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("%s: invalid stop type", __func__));
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if (!smp_started)
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return (0);
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CTR2(KTR_SMP, "stop_cpus(%s) with %u type",
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cpusetobj_strprint(cpusetbuf, &map), type);
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if (stopping_cpu != PCPU_GET(cpuid))
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while (atomic_cmpset_int(&stopping_cpu, NOCPU,
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PCPU_GET(cpuid)) == 0)
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while (stopping_cpu != NOCPU)
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cpu_spinwait(); /* spin */
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/* send the stop IPI to all CPUs in map */
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ipi_selected(map, type);
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i = 0;
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while (!CPU_SUBSET(&stopped_cpus, &map)) {
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/* spin */
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cpu_spinwait();
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i++;
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#ifdef DIAGNOSTIC
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if (i == 100000) {
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printf("timeout stopping cpus\n");
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break;
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}
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#endif
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}
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stopping_cpu = NOCPU;
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return (1);
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}
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int
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stop_cpus(cpuset_t map)
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{
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return (generic_stop_cpus(map, IPI_STOP));
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}
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int
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stop_cpus_hard(cpuset_t map)
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{
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return (generic_stop_cpus(map, IPI_STOP_HARD));
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}
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#if defined(__amd64__)
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int
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suspend_cpus(cpuset_t map)
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{
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return (generic_stop_cpus(map, IPI_SUSPEND));
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}
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#endif
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/*
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* Called by a CPU to restart stopped CPUs.
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*
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* Usually (but not necessarily) called with 'stopped_cpus' as its arg.
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*
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* - Signals all CPUs in map to restart.
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* - Waits for each to restart.
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*
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* Returns:
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* -1: error
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* 0: NA
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* 1: ok
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*/
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int
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restart_cpus(cpuset_t map)
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{
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#ifdef KTR
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char cpusetbuf[CPUSETBUFSIZ];
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#endif
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if (!smp_started)
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return 0;
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CTR1(KTR_SMP, "restart_cpus(%s)", cpusetobj_strprint(cpusetbuf, &map));
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/* signal other cpus to restart */
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CPU_COPY_STORE_REL(&map, &started_cpus);
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/* wait for each to clear its bit */
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while (CPU_OVERLAP(&stopped_cpus, &map))
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cpu_spinwait();
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return 1;
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}
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/*
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* All-CPU rendezvous. CPUs are signalled, all execute the setup function
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* (if specified), rendezvous, execute the action function (if specified),
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* rendezvous again, execute the teardown function (if specified), and then
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* resume.
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*
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* Note that the supplied external functions _must_ be reentrant and aware
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* that they are running in parallel and in an unknown lock context.
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*/
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void
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smp_rendezvous_action(void)
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{
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void *local_func_arg;
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void (*local_setup_func)(void*);
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void (*local_action_func)(void*);
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void (*local_teardown_func)(void*);
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int generation;
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/* Ensure we have up-to-date values. */
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atomic_add_acq_int(&smp_rv_waiters[0], 1);
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while (smp_rv_waiters[0] < smp_rv_ncpus)
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cpu_spinwait();
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/* Fetch rendezvous parameters after acquire barrier. */
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local_func_arg = smp_rv_func_arg;
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local_setup_func = smp_rv_setup_func;
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local_action_func = smp_rv_action_func;
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local_teardown_func = smp_rv_teardown_func;
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generation = smp_rv_generation;
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/*
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* If requested, run a setup function before the main action
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* function. Ensure all CPUs have completed the setup
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* function before moving on to the action function.
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*/
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if (local_setup_func != smp_no_rendevous_barrier) {
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if (smp_rv_setup_func != NULL)
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smp_rv_setup_func(smp_rv_func_arg);
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atomic_add_int(&smp_rv_waiters[1], 1);
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while (smp_rv_waiters[1] < smp_rv_ncpus)
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cpu_spinwait();
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}
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if (local_action_func != NULL)
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local_action_func(local_func_arg);
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/*
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* Signal that the main action has been completed. If a
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* full exit rendezvous is requested, then all CPUs will
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* wait here until all CPUs have finished the main action.
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*
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* Note that the write by the last CPU to finish the action
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* may become visible to different CPUs at different times.
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* As a result, the CPU that initiated the rendezvous may
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* exit the rendezvous and drop the lock allowing another
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* rendezvous to be initiated on the same CPU or a different
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* CPU. In that case the exit sentinel may be cleared before
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* all CPUs have noticed causing those CPUs to hang forever.
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* Workaround this by using a generation count to notice when
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* this race occurs and to exit the rendezvous in that case.
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*/
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MPASS(generation == smp_rv_generation);
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atomic_add_int(&smp_rv_waiters[2], 1);
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if (local_teardown_func == smp_no_rendevous_barrier)
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return;
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while (smp_rv_waiters[2] < smp_rv_ncpus &&
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generation == smp_rv_generation)
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cpu_spinwait();
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if (local_teardown_func != NULL)
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local_teardown_func(local_func_arg);
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}
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void
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smp_rendezvous_cpus(cpuset_t map,
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void (* setup_func)(void *),
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void (* action_func)(void *),
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void (* teardown_func)(void *),
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void *arg)
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{
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int curcpumap, i, ncpus = 0;
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if (!smp_started) {
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if (setup_func != NULL)
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setup_func(arg);
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if (action_func != NULL)
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action_func(arg);
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if (teardown_func != NULL)
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teardown_func(arg);
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return;
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}
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CPU_FOREACH(i) {
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if (CPU_ISSET(i, &map))
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ncpus++;
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}
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if (ncpus == 0)
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panic("ncpus is 0 with non-zero map");
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mtx_lock_spin(&smp_ipi_mtx);
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atomic_add_acq_int(&smp_rv_generation, 1);
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/* Pass rendezvous parameters via global variables. */
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smp_rv_ncpus = ncpus;
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smp_rv_setup_func = setup_func;
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smp_rv_action_func = action_func;
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smp_rv_teardown_func = teardown_func;
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smp_rv_func_arg = arg;
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smp_rv_waiters[1] = 0;
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smp_rv_waiters[2] = 0;
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atomic_store_rel_int(&smp_rv_waiters[0], 0);
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/*
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* Signal other processors, which will enter the IPI with
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* interrupts off.
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*/
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curcpumap = CPU_ISSET(curcpu, &map);
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CPU_CLR(curcpu, &map);
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ipi_selected(map, IPI_RENDEZVOUS);
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/* Check if the current CPU is in the map */
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if (curcpumap != 0)
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smp_rendezvous_action();
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/*
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* If the caller did not request an exit barrier to be enforced
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* on each CPU, ensure that this CPU waits for all the other
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* CPUs to finish the rendezvous.
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*/
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if (teardown_func == smp_no_rendevous_barrier)
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while (atomic_load_acq_int(&smp_rv_waiters[2]) < ncpus)
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cpu_spinwait();
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mtx_unlock_spin(&smp_ipi_mtx);
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}
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void
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smp_rendezvous(void (* setup_func)(void *),
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void (* action_func)(void *),
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void (* teardown_func)(void *),
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void *arg)
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{
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smp_rendezvous_cpus(all_cpus, setup_func, action_func, teardown_func, arg);
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}
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static struct cpu_group group[MAXCPU];
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struct cpu_group *
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smp_topo(void)
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{
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char cpusetbuf[CPUSETBUFSIZ], cpusetbuf2[CPUSETBUFSIZ];
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struct cpu_group *top;
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/*
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* Check for a fake topology request for debugging purposes.
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*/
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switch (smp_topology) {
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case 1:
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/* Dual core with no sharing. */
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top = smp_topo_1level(CG_SHARE_NONE, 2, 0);
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break;
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case 2:
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/* No topology, all cpus are equal. */
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top = smp_topo_none();
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break;
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case 3:
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/* Dual core with shared L2. */
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top = smp_topo_1level(CG_SHARE_L2, 2, 0);
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break;
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case 4:
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/* quad core, shared l3 among each package, private l2. */
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top = smp_topo_1level(CG_SHARE_L3, 4, 0);
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break;
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case 5:
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/* quad core, 2 dualcore parts on each package share l2. */
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top = smp_topo_2level(CG_SHARE_NONE, 2, CG_SHARE_L2, 2, 0);
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break;
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case 6:
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/* Single-core 2xHTT */
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top = smp_topo_1level(CG_SHARE_L1, 2, CG_FLAG_HTT);
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break;
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case 7:
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/* quad core with a shared l3, 8 threads sharing L2. */
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top = smp_topo_2level(CG_SHARE_L3, 4, CG_SHARE_L2, 8,
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CG_FLAG_SMT);
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break;
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default:
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/* Default, ask the system what it wants. */
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top = cpu_topo();
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break;
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}
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/*
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* Verify the returned topology.
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*/
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if (top->cg_count != mp_ncpus)
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panic("Built bad topology at %p. CPU count %d != %d",
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|
top, top->cg_count, mp_ncpus);
|
|
if (CPU_CMP(&top->cg_mask, &all_cpus))
|
|
panic("Built bad topology at %p. CPU mask (%s) != (%s)",
|
|
top, cpusetobj_strprint(cpusetbuf, &top->cg_mask),
|
|
cpusetobj_strprint(cpusetbuf2, &all_cpus));
|
|
return (top);
|
|
}
|
|
|
|
struct cpu_group *
|
|
smp_topo_none(void)
|
|
{
|
|
struct cpu_group *top;
|
|
|
|
top = &group[0];
|
|
top->cg_parent = NULL;
|
|
top->cg_child = NULL;
|
|
top->cg_mask = all_cpus;
|
|
top->cg_count = mp_ncpus;
|
|
top->cg_children = 0;
|
|
top->cg_level = CG_SHARE_NONE;
|
|
top->cg_flags = 0;
|
|
|
|
return (top);
|
|
}
|
|
|
|
static int
|
|
smp_topo_addleaf(struct cpu_group *parent, struct cpu_group *child, int share,
|
|
int count, int flags, int start)
|
|
{
|
|
char cpusetbuf[CPUSETBUFSIZ], cpusetbuf2[CPUSETBUFSIZ];
|
|
cpuset_t mask;
|
|
int i;
|
|
|
|
CPU_ZERO(&mask);
|
|
for (i = 0; i < count; i++, start++)
|
|
CPU_SET(start, &mask);
|
|
child->cg_parent = parent;
|
|
child->cg_child = NULL;
|
|
child->cg_children = 0;
|
|
child->cg_level = share;
|
|
child->cg_count = count;
|
|
child->cg_flags = flags;
|
|
child->cg_mask = mask;
|
|
parent->cg_children++;
|
|
for (; parent != NULL; parent = parent->cg_parent) {
|
|
if (CPU_OVERLAP(&parent->cg_mask, &child->cg_mask))
|
|
panic("Duplicate children in %p. mask (%s) child (%s)",
|
|
parent,
|
|
cpusetobj_strprint(cpusetbuf, &parent->cg_mask),
|
|
cpusetobj_strprint(cpusetbuf2, &child->cg_mask));
|
|
CPU_OR(&parent->cg_mask, &child->cg_mask);
|
|
parent->cg_count += child->cg_count;
|
|
}
|
|
|
|
return (start);
|
|
}
|
|
|
|
struct cpu_group *
|
|
smp_topo_1level(int share, int count, int flags)
|
|
{
|
|
struct cpu_group *child;
|
|
struct cpu_group *top;
|
|
int packages;
|
|
int cpu;
|
|
int i;
|
|
|
|
cpu = 0;
|
|
top = &group[0];
|
|
packages = mp_ncpus / count;
|
|
top->cg_child = child = &group[1];
|
|
top->cg_level = CG_SHARE_NONE;
|
|
for (i = 0; i < packages; i++, child++)
|
|
cpu = smp_topo_addleaf(top, child, share, count, flags, cpu);
|
|
return (top);
|
|
}
|
|
|
|
struct cpu_group *
|
|
smp_topo_2level(int l2share, int l2count, int l1share, int l1count,
|
|
int l1flags)
|
|
{
|
|
struct cpu_group *top;
|
|
struct cpu_group *l1g;
|
|
struct cpu_group *l2g;
|
|
int cpu;
|
|
int i;
|
|
int j;
|
|
|
|
cpu = 0;
|
|
top = &group[0];
|
|
l2g = &group[1];
|
|
top->cg_child = l2g;
|
|
top->cg_level = CG_SHARE_NONE;
|
|
top->cg_children = mp_ncpus / (l2count * l1count);
|
|
l1g = l2g + top->cg_children;
|
|
for (i = 0; i < top->cg_children; i++, l2g++) {
|
|
l2g->cg_parent = top;
|
|
l2g->cg_child = l1g;
|
|
l2g->cg_level = l2share;
|
|
for (j = 0; j < l2count; j++, l1g++)
|
|
cpu = smp_topo_addleaf(l2g, l1g, l1share, l1count,
|
|
l1flags, cpu);
|
|
}
|
|
return (top);
|
|
}
|
|
|
|
|
|
struct cpu_group *
|
|
smp_topo_find(struct cpu_group *top, int cpu)
|
|
{
|
|
struct cpu_group *cg;
|
|
cpuset_t mask;
|
|
int children;
|
|
int i;
|
|
|
|
CPU_SETOF(cpu, &mask);
|
|
cg = top;
|
|
for (;;) {
|
|
if (!CPU_OVERLAP(&cg->cg_mask, &mask))
|
|
return (NULL);
|
|
if (cg->cg_children == 0)
|
|
return (cg);
|
|
children = cg->cg_children;
|
|
for (i = 0, cg = cg->cg_child; i < children; cg++, i++)
|
|
if (CPU_OVERLAP(&cg->cg_mask, &mask))
|
|
break;
|
|
}
|
|
return (NULL);
|
|
}
|
|
#else /* !SMP */
|
|
|
|
void
|
|
smp_rendezvous_cpus(cpuset_t map,
|
|
void (*setup_func)(void *),
|
|
void (*action_func)(void *),
|
|
void (*teardown_func)(void *),
|
|
void *arg)
|
|
{
|
|
if (setup_func != NULL)
|
|
setup_func(arg);
|
|
if (action_func != NULL)
|
|
action_func(arg);
|
|
if (teardown_func != NULL)
|
|
teardown_func(arg);
|
|
}
|
|
|
|
void
|
|
smp_rendezvous(void (*setup_func)(void *),
|
|
void (*action_func)(void *),
|
|
void (*teardown_func)(void *),
|
|
void *arg)
|
|
{
|
|
|
|
if (setup_func != NULL)
|
|
setup_func(arg);
|
|
if (action_func != NULL)
|
|
action_func(arg);
|
|
if (teardown_func != NULL)
|
|
teardown_func(arg);
|
|
}
|
|
|
|
/*
|
|
* Provide dummy SMP support for UP kernels. Modules that need to use SMP
|
|
* APIs will still work using this dummy support.
|
|
*/
|
|
static void
|
|
mp_setvariables_for_up(void *dummy)
|
|
{
|
|
mp_ncpus = 1;
|
|
mp_maxid = PCPU_GET(cpuid);
|
|
all_cpus = PCPU_GET(cpumask);
|
|
KASSERT(PCPU_GET(cpuid) == 0, ("UP must have a CPU ID of zero"));
|
|
}
|
|
SYSINIT(cpu_mp_setvariables, SI_SUB_TUNABLES, SI_ORDER_FIRST,
|
|
mp_setvariables_for_up, NULL);
|
|
#endif /* SMP */
|
|
|
|
void
|
|
smp_no_rendevous_barrier(void *dummy)
|
|
{
|
|
#ifdef SMP
|
|
KASSERT((!smp_started),("smp_no_rendevous called and smp is started"));
|
|
#endif
|
|
}
|