2005-01-06 23:35:40 +00:00
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/*-
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2008-11-03 21:17:02 +00:00
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* Copyright (c) 2001, John Baldwin <jhb@FreeBSD.org>.
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* All rights reserved.
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1997-04-26 11:46:25 +00:00
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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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2001-04-27 19:28:25 +00:00
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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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2008-11-03 21:17:02 +00:00
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* 3. Neither the name of the author nor the names of any co-contributors
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2001-04-27 19:28:25 +00:00
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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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1997-04-26 11:46:25 +00:00
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*
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2008-11-03 21:17:02 +00:00
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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1997-04-26 11:46:25 +00:00
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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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2008-11-03 21:17:02 +00:00
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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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1997-04-26 11:46:25 +00:00
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*/
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2001-04-27 19:28:25 +00:00
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/*
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* This module holds the global variables and machine independent functions
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2001-05-10 17:45:49 +00:00
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* used for the kernel SMP support.
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2001-04-27 19:28:25 +00:00
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*/
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1997-12-08 23:00:24 +00:00
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2003-06-11 00:56:59 +00:00
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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1997-08-25 21:28:08 +00:00
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#include <sys/param.h>
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1997-04-26 11:46:25 +00:00
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#include <sys/systm.h>
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2001-05-10 17:45:49 +00:00
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#include <sys/kernel.h>
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2001-04-27 19:28:25 +00:00
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#include <sys/ktr.h>
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1997-08-26 18:10:38 +00:00
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#include <sys/proc.h>
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2004-03-09 03:37:21 +00:00
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#include <sys/bus.h>
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2001-04-27 19:28:25 +00:00
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#include <sys/lock.h>
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2000-10-20 07:58:15 +00:00
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#include <sys/mutex.h>
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2001-05-10 17:45:49 +00:00
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#include <sys/pcpu.h>
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2001-04-27 19:28:25 +00:00
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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1997-04-26 11:46:25 +00:00
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2007-07-03 18:37:06 +00:00
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#include <machine/cpu.h>
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2002-03-07 04:43:51 +00:00
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#include <machine/smp.h>
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2004-09-01 06:42:02 +00:00
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#include "opt_sched.h"
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2003-12-03 14:55:31 +00:00
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#ifdef SMP
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2004-03-27 18:21:24 +00:00
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volatile cpumask_t stopped_cpus;
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volatile cpumask_t started_cpus;
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2004-09-01 06:42:02 +00:00
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cpumask_t idle_cpus_mask;
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cpumask_t hlt_cpus_mask;
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cpumask_t logical_cpus_mask;
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1997-04-26 11:46:25 +00:00
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2002-03-19 21:25:46 +00:00
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void (*cpustop_restartfunc)(void);
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2003-12-03 14:55:31 +00:00
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#endif
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2004-09-03 07:42:31 +00:00
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/* This is used in modules that need to work in both SMP and UP. */
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2004-09-01 18:05:43 +00:00
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cpumask_t all_cpus;
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2003-12-03 14:55:31 +00:00
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2001-04-27 19:28:25 +00:00
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int mp_ncpus;
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2003-12-23 13:54:16 +00:00
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/* export this for libkvm consumers. */
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int mp_maxcpus = MAXCPU;
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1997-04-26 11:46:25 +00:00
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2001-10-31 20:43:38 +00:00
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volatile int smp_started;
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2002-03-05 10:01:46 +00:00
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u_int mp_maxid;
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1997-04-26 11:46:25 +00:00
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2001-04-27 19:28:25 +00:00
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SYSCTL_NODE(_kern, OID_AUTO, smp, CTLFLAG_RD, NULL, "Kernel SMP");
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1997-04-26 11:46:25 +00:00
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2008-05-23 04:05:26 +00:00
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SYSCTL_INT(_kern_smp, OID_AUTO, maxid, CTLFLAG_RD, &mp_maxid, 0,
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"Max CPU ID.");
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2003-12-23 13:54:16 +00:00
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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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2001-04-27 19:28:25 +00:00
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int smp_active = 0; /* are the APs allowed to run? */
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2003-06-12 19:46:51 +00:00
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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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1997-04-26 11:46:25 +00:00
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2002-12-28 23:21:13 +00:00
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int smp_disabled = 0; /* has smp been disabled? */
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2003-10-21 18:28:36 +00:00
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SYSCTL_INT(_kern_smp, OID_AUTO, disabled, CTLFLAG_RDTUN, &smp_disabled, 0,
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2003-06-12 19:46:51 +00:00
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"SMP has been disabled from the loader");
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2002-12-28 23:21:13 +00:00
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TUNABLE_INT("kern.smp.disabled", &smp_disabled);
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2001-04-27 19:28:25 +00:00
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int smp_cpus = 1; /* how many cpu's running */
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2003-06-12 19:46:51 +00:00
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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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1997-04-26 11:46:25 +00:00
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2008-03-02 07:58:42 +00:00
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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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2003-12-03 14:55:31 +00:00
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#ifdef SMP
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2001-04-27 19:28:25 +00:00
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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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2003-06-12 19:46:51 +00:00
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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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1997-04-26 11:46:25 +00:00
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2001-04-27 19:28:25 +00:00
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/* Enable forwarding of roundrobin to all other cpus */
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static int forward_roundrobin_enabled = 1;
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SYSCTL_INT(_kern_smp, OID_AUTO, forward_roundrobin_enabled, CTLFLAG_RW,
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2003-06-12 19:46:51 +00:00
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&forward_roundrobin_enabled, 0,
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"Forwarding of roundrobin to all other CPUs");
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1997-04-26 11:46:25 +00:00
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2001-04-27 19:28:25 +00:00
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/* Variables needed for SMP rendezvous. */
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2008-08-27 18:23:55 +00:00
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static volatile int smp_rv_ncpus;
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2007-11-08 14:47:55 +00:00
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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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2008-01-02 17:09:15 +00:00
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static void (*volatile smp_rv_teardown_func)(void *arg);
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2009-01-26 15:32:39 +00:00
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static void *volatile smp_rv_func_arg;
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2007-07-03 18:37:06 +00:00
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static volatile int smp_rv_waiters[3];
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2004-08-23 21:39:29 +00:00
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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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2004-08-28 00:49:55 +00:00
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struct mtx smp_ipi_mtx;
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1997-04-26 11:46:25 +00:00
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/*
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2003-11-21 22:23:26 +00:00
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* Let the MD SMP code initialize mp_maxid very early if it can.
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2002-03-05 10:01:46 +00:00
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*/
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static void
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2003-11-21 22:23:26 +00:00
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mp_setmaxid(void *dummy)
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2002-03-05 10:01:46 +00:00
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{
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2003-11-21 22:23:26 +00:00
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cpu_mp_setmaxid();
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2002-03-05 10:01:46 +00:00
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}
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2008-03-16 10:58:09 +00:00
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SYSINIT(cpu_mp_setmaxid, SI_SUB_TUNABLES, SI_ORDER_FIRST, mp_setmaxid, NULL);
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2002-03-05 10:01:46 +00:00
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/*
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* Call the MD SMP initialization code.
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1997-04-26 11:46:25 +00:00
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*/
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2001-04-27 19:28:25 +00:00
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static void
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mp_start(void *dummy)
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1997-04-26 11:46:25 +00:00
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{
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1997-04-28 00:25:00 +00:00
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2001-04-27 19:28:25 +00:00
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/* Probe for MP hardware. */
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2003-11-21 22:23:26 +00:00
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if (smp_disabled != 0 || cpu_mp_probe() == 0) {
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2003-10-30 21:44:01 +00:00
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mp_ncpus = 1;
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2003-11-21 22:23:26 +00:00
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all_cpus = PCPU_GET(cpumask);
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2001-04-27 19:28:25 +00:00
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return;
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2003-10-30 21:44:01 +00:00
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}
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1997-04-26 11:46:25 +00:00
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2004-08-28 00:49:55 +00:00
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mtx_init(&smp_ipi_mtx, "smp rendezvous", NULL, MTX_SPIN);
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2001-04-27 19:28:25 +00:00
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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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1997-04-26 11:46:25 +00:00
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}
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2008-03-16 10:58:09 +00:00
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SYSINIT(cpu_mp, SI_SUB_CPU, SI_ORDER_THIRD, mp_start, NULL);
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1997-06-27 23:33:17 +00:00
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1997-12-08 23:00:24 +00:00
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void
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2001-09-12 08:38:13 +00:00
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forward_signal(struct thread *td)
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1998-03-03 20:55:26 +00:00
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{
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int id;
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2001-04-27 19:28:25 +00:00
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/*
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2003-03-31 22:49:17 +00:00
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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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2002-04-05 10:00:37 +00:00
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* executing so that it executes ast().
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1998-03-03 20:55:26 +00:00
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*/
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Commit 14/14 of sched_lock decomposition.
- Use thread_lock() rather than sched_lock for per-thread scheduling
sychronization.
- Use the per-process spinlock rather than the sched_lock for per-process
scheduling synchronization.
Tested by: kris, current@
Tested on: i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc.
Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each)
2007-06-05 00:00:57 +00:00
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THREAD_LOCK_ASSERT(td, MA_OWNED);
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2002-09-11 08:13:56 +00:00
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KASSERT(TD_IS_RUNNING(td),
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Part 1 of KSE-III
The ability to schedule multiple threads per process
(one one cpu) by making ALL system calls optionally asynchronous.
to come: ia64 and power-pc patches, patches for gdb, test program (in tools)
Reviewed by: Almost everyone who counts
(at various times, peter, jhb, matt, alfred, mini, bernd,
and a cast of thousands)
NOTE: this is still Beta code, and contains lots of debugging stuff.
expect slight instability in signals..
2002-06-29 17:26:22 +00:00
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("forward_signal: thread is not TDS_RUNNING"));
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1998-03-03 20:55:26 +00:00
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2001-09-12 08:38:13 +00:00
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CTR1(KTR_SMP, "forward_signal(%p)", td->td_proc);
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2001-01-24 09:48:52 +00:00
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2001-04-27 19:28:25 +00:00
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if (!smp_started || cold || panicstr)
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1998-03-03 20:55:26 +00:00
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return;
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if (!forward_signal_enabled)
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return;
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2001-04-27 19:28:25 +00:00
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/* No need to IPI ourself. */
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2001-09-12 08:38:13 +00:00
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if (td == curthread)
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2001-04-27 19:28:25 +00:00
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return;
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2003-04-10 17:35:44 +00:00
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id = td->td_oncpu;
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2001-04-27 19:28:25 +00:00
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if (id == NOCPU)
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return;
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ipi_selected(1 << id, IPI_AST);
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1998-03-03 20:55:26 +00:00
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}
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1998-03-03 22:56:30 +00:00
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1998-05-17 22:12:14 +00:00
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void
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forward_roundrobin(void)
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{
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2001-12-11 23:33:44 +00:00
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struct pcpu *pc;
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2001-09-12 08:38:13 +00:00
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struct thread *td;
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2004-08-13 00:57:43 +00:00
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cpumask_t id, map, me;
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2001-04-27 19:28:25 +00:00
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2001-01-24 09:48:52 +00:00
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CTR0(KTR_SMP, "forward_roundrobin()");
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2001-04-27 19:28:25 +00:00
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if (!smp_started || cold || panicstr)
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1998-05-17 22:12:14 +00:00
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return;
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if (!forward_roundrobin_enabled)
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return;
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2001-04-27 19:28:25 +00:00
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map = 0;
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2004-08-13 00:57:43 +00:00
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me = PCPU_GET(cpumask);
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2001-12-11 23:33:44 +00:00
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SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
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td = pc->pc_curthread;
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2002-01-05 09:38:47 +00:00
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id = pc->pc_cpumask;
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2004-08-13 00:57:43 +00:00
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if (id != me && (id & stopped_cpus) == 0 &&
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2007-03-08 06:44:34 +00:00
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!TD_IS_IDLETHREAD(td)) {
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2003-02-17 09:55:10 +00:00
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td->td_flags |= TDF_NEEDRESCHED;
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2001-04-27 19:28:25 +00:00
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map |= id;
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1998-05-17 22:12:14 +00:00
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}
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}
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2001-04-27 19:28:25 +00:00
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ipi_selected(map, IPI_AST);
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1998-05-17 22:12:14 +00:00
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}
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2001-01-24 09:48:52 +00:00
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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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* XXX FIXME: this is not MP-safe, needs a lock to prevent multiple CPUs
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* from executing at same time.
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*/
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int
|
2004-03-27 18:21:24 +00:00
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stop_cpus(cpumask_t map)
|
2001-01-24 09:48:52 +00:00
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{
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2001-04-27 19:28:25 +00:00
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int i;
|
2001-01-24 09:48:52 +00:00
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if (!smp_started)
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return 0;
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2001-04-27 19:28:25 +00:00
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CTR1(KTR_SMP, "stop_cpus(%x)", map);
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/* send the stop IPI to all CPUs in map */
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2001-04-11 17:06:02 +00:00
|
|
|
ipi_selected(map, IPI_STOP);
|
2004-03-27 18:21:24 +00:00
|
|
|
|
2001-04-27 19:28:25 +00:00
|
|
|
i = 0;
|
2007-07-03 18:37:06 +00:00
|
|
|
while ((stopped_cpus & map) != map) {
|
2001-04-27 19:28:25 +00:00
|
|
|
/* spin */
|
2007-07-03 18:37:06 +00:00
|
|
|
cpu_spinwait();
|
2001-04-27 19:28:25 +00:00
|
|
|
i++;
|
2001-01-24 09:48:52 +00:00
|
|
|
#ifdef DIAGNOSTIC
|
2001-04-27 19:28:25 +00:00
|
|
|
if (i == 100000) {
|
|
|
|
printf("timeout stopping cpus\n");
|
|
|
|
break;
|
|
|
|
}
|
2001-01-24 09:48:52 +00:00
|
|
|
#endif
|
2001-04-27 19:28:25 +00:00
|
|
|
}
|
2001-01-24 09:48:52 +00:00
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2009-03-17 00:48:11 +00:00
|
|
|
#if defined(__amd64__)
|
|
|
|
/*
|
|
|
|
* When called the executing CPU will send an IPI to all other CPUs
|
|
|
|
* requesting that they halt execution.
|
|
|
|
*
|
|
|
|
* Usually (but not necessarily) called with 'other_cpus' as its arg.
|
|
|
|
*
|
|
|
|
* - Signals all CPUs in map to suspend.
|
|
|
|
* - Waits for each to suspend.
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
* -1: error
|
|
|
|
* 0: NA
|
|
|
|
* 1: ok
|
|
|
|
*
|
|
|
|
* XXX FIXME: this is not MP-safe, needs a lock to prevent multiple CPUs
|
|
|
|
* from executing at same time.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
suspend_cpus(cpumask_t map)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (!smp_started)
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
CTR1(KTR_SMP, "suspend_cpus(%x)", map);
|
|
|
|
|
|
|
|
/* send the suspend IPI to all CPUs in map */
|
|
|
|
ipi_selected(map, IPI_SUSPEND);
|
|
|
|
|
|
|
|
i = 0;
|
|
|
|
while ((stopped_cpus & map) != map) {
|
|
|
|
/* spin */
|
|
|
|
cpu_spinwait();
|
|
|
|
i++;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
|
|
if (i == 100000) {
|
|
|
|
printf("timeout suspending cpus\n");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2001-01-24 09:48:52 +00:00
|
|
|
/*
|
|
|
|
* Called by a CPU to restart stopped CPUs.
|
|
|
|
*
|
|
|
|
* Usually (but not necessarily) called with 'stopped_cpus' as its arg.
|
|
|
|
*
|
|
|
|
* - Signals all CPUs in map to restart.
|
|
|
|
* - Waits for each to restart.
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
* -1: error
|
|
|
|
* 0: NA
|
|
|
|
* 1: ok
|
|
|
|
*/
|
|
|
|
int
|
2004-03-27 18:21:24 +00:00
|
|
|
restart_cpus(cpumask_t map)
|
2001-01-24 09:48:52 +00:00
|
|
|
{
|
|
|
|
|
|
|
|
if (!smp_started)
|
|
|
|
return 0;
|
|
|
|
|
2001-04-27 19:28:25 +00:00
|
|
|
CTR1(KTR_SMP, "restart_cpus(%x)", map);
|
2001-01-24 09:48:52 +00:00
|
|
|
|
2001-04-27 19:28:25 +00:00
|
|
|
/* signal other cpus to restart */
|
|
|
|
atomic_store_rel_int(&started_cpus, map);
|
2001-01-24 09:48:52 +00:00
|
|
|
|
2001-04-27 19:28:25 +00:00
|
|
|
/* wait for each to clear its bit */
|
2007-07-03 18:37:06 +00:00
|
|
|
while ((stopped_cpus & map) != 0)
|
|
|
|
cpu_spinwait();
|
2001-01-24 09:48:52 +00:00
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
1999-07-20 06:52:35 +00:00
|
|
|
/*
|
|
|
|
* All-CPU rendezvous. CPUs are signalled, all execute the setup function
|
|
|
|
* (if specified), rendezvous, execute the action function (if specified),
|
|
|
|
* rendezvous again, execute the teardown function (if specified), and then
|
|
|
|
* resume.
|
|
|
|
*
|
|
|
|
* Note that the supplied external functions _must_ be reentrant and aware
|
|
|
|
* that they are running in parallel and in an unknown lock context.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
smp_rendezvous_action(void)
|
|
|
|
{
|
2007-11-08 14:47:55 +00:00
|
|
|
void* local_func_arg = smp_rv_func_arg;
|
|
|
|
void (*local_setup_func)(void*) = smp_rv_setup_func;
|
|
|
|
void (*local_action_func)(void*) = smp_rv_action_func;
|
|
|
|
void (*local_teardown_func)(void*) = smp_rv_teardown_func;
|
2008-01-02 17:09:15 +00:00
|
|
|
|
2007-07-03 18:37:06 +00:00
|
|
|
/* Ensure we have up-to-date values. */
|
|
|
|
atomic_add_acq_int(&smp_rv_waiters[0], 1);
|
2008-08-27 18:23:55 +00:00
|
|
|
while (smp_rv_waiters[0] < smp_rv_ncpus)
|
2007-07-03 18:37:06 +00:00
|
|
|
cpu_spinwait();
|
|
|
|
|
1999-07-20 06:52:35 +00:00
|
|
|
/* setup function */
|
2007-11-08 14:47:55 +00:00
|
|
|
if (local_setup_func != smp_no_rendevous_barrier) {
|
|
|
|
if (smp_rv_setup_func != NULL)
|
|
|
|
smp_rv_setup_func(smp_rv_func_arg);
|
2008-01-02 17:09:15 +00:00
|
|
|
|
2007-11-08 14:47:55 +00:00
|
|
|
/* spin on entry rendezvous */
|
|
|
|
atomic_add_int(&smp_rv_waiters[1], 1);
|
2008-08-27 18:23:55 +00:00
|
|
|
while (smp_rv_waiters[1] < smp_rv_ncpus)
|
2007-11-08 14:47:55 +00:00
|
|
|
cpu_spinwait();
|
|
|
|
}
|
2007-07-03 18:37:06 +00:00
|
|
|
|
1999-07-20 06:52:35 +00:00
|
|
|
/* action function */
|
2007-11-08 14:47:55 +00:00
|
|
|
if (local_action_func != NULL)
|
|
|
|
local_action_func(local_func_arg);
|
|
|
|
|
1999-07-20 06:52:35 +00:00
|
|
|
/* spin on exit rendezvous */
|
2007-07-03 18:37:06 +00:00
|
|
|
atomic_add_int(&smp_rv_waiters[2], 1);
|
2007-11-08 14:47:55 +00:00
|
|
|
if (local_teardown_func == smp_no_rendevous_barrier)
|
|
|
|
return;
|
2008-08-27 18:23:55 +00:00
|
|
|
while (smp_rv_waiters[2] < smp_rv_ncpus)
|
2007-07-03 18:37:06 +00:00
|
|
|
cpu_spinwait();
|
2008-01-02 17:09:15 +00:00
|
|
|
|
1999-07-20 06:52:35 +00:00
|
|
|
/* teardown function */
|
2007-11-08 14:47:55 +00:00
|
|
|
if (local_teardown_func != NULL)
|
|
|
|
local_teardown_func(local_func_arg);
|
1999-07-20 06:52:35 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2008-05-23 04:05:26 +00:00
|
|
|
smp_rendezvous_cpus(cpumask_t map,
|
|
|
|
void (* setup_func)(void *),
|
|
|
|
void (* action_func)(void *),
|
|
|
|
void (* teardown_func)(void *),
|
|
|
|
void *arg)
|
1999-07-20 06:52:35 +00:00
|
|
|
{
|
2008-05-23 04:05:26 +00:00
|
|
|
int i, ncpus = 0;
|
2001-01-24 12:35:55 +00:00
|
|
|
|
2001-04-27 19:28:25 +00:00
|
|
|
if (!smp_started) {
|
|
|
|
if (setup_func != NULL)
|
|
|
|
setup_func(arg);
|
|
|
|
if (action_func != NULL)
|
|
|
|
action_func(arg);
|
|
|
|
if (teardown_func != NULL)
|
|
|
|
teardown_func(arg);
|
|
|
|
return;
|
|
|
|
}
|
2008-05-23 04:05:26 +00:00
|
|
|
|
2009-03-01 14:26:24 +00:00
|
|
|
for (i = 0; i <= mp_maxid; i++)
|
2008-08-27 18:23:55 +00:00
|
|
|
if (((1 << i) & map) != 0 && !CPU_ABSENT(i))
|
2008-05-23 04:05:26 +00:00
|
|
|
ncpus++;
|
2009-03-01 14:26:24 +00:00
|
|
|
if (ncpus == 0)
|
2009-03-03 17:34:09 +00:00
|
|
|
panic("ncpus is 0 with map=0x%x", map);
|
2008-08-27 18:23:55 +00:00
|
|
|
|
1999-07-20 06:52:35 +00:00
|
|
|
/* obtain rendezvous lock */
|
2004-08-28 00:49:55 +00:00
|
|
|
mtx_lock_spin(&smp_ipi_mtx);
|
1999-07-20 06:52:35 +00:00
|
|
|
|
|
|
|
/* set static function pointers */
|
2008-08-27 18:23:55 +00:00
|
|
|
smp_rv_ncpus = ncpus;
|
1999-07-20 06:52:35 +00:00
|
|
|
smp_rv_setup_func = setup_func;
|
|
|
|
smp_rv_action_func = action_func;
|
|
|
|
smp_rv_teardown_func = teardown_func;
|
|
|
|
smp_rv_func_arg = arg;
|
|
|
|
smp_rv_waiters[1] = 0;
|
2007-07-03 18:37:06 +00:00
|
|
|
smp_rv_waiters[2] = 0;
|
|
|
|
atomic_store_rel_int(&smp_rv_waiters[0], 0);
|
1999-07-20 06:52:35 +00:00
|
|
|
|
2001-04-27 19:28:25 +00:00
|
|
|
/* signal other processors, which will enter the IPI with interrupts off */
|
2008-05-23 04:05:26 +00:00
|
|
|
ipi_selected(map & ~(1 << curcpu), IPI_RENDEZVOUS);
|
1999-07-20 06:52:35 +00:00
|
|
|
|
2008-05-23 04:05:26 +00:00
|
|
|
/* Check if the current CPU is in the map */
|
|
|
|
if ((map & (1 << curcpu)) != 0)
|
|
|
|
smp_rendezvous_action();
|
1999-07-20 06:52:35 +00:00
|
|
|
|
2008-01-02 17:09:15 +00:00
|
|
|
if (teardown_func == smp_no_rendevous_barrier)
|
2008-05-23 04:05:26 +00:00
|
|
|
while (atomic_load_acq_int(&smp_rv_waiters[2]) < ncpus)
|
2007-11-08 14:47:55 +00:00
|
|
|
cpu_spinwait();
|
2008-01-02 17:09:15 +00:00
|
|
|
|
1999-07-20 06:52:35 +00:00
|
|
|
/* release lock */
|
2004-08-28 00:49:55 +00:00
|
|
|
mtx_unlock_spin(&smp_ipi_mtx);
|
1999-07-20 06:52:35 +00:00
|
|
|
}
|
2003-12-03 14:55:31 +00:00
|
|
|
|
2008-05-23 04:05:26 +00:00
|
|
|
void
|
|
|
|
smp_rendezvous(void (* setup_func)(void *),
|
|
|
|
void (* action_func)(void *),
|
|
|
|
void (* teardown_func)(void *),
|
|
|
|
void *arg)
|
|
|
|
{
|
|
|
|
smp_rendezvous_cpus(all_cpus, setup_func, action_func, teardown_func, arg);
|
|
|
|
}
|
|
|
|
|
2008-03-02 07:58:42 +00:00
|
|
|
static struct cpu_group group[MAXCPU];
|
|
|
|
|
|
|
|
struct cpu_group *
|
|
|
|
smp_topo(void)
|
2003-12-03 14:55:31 +00:00
|
|
|
{
|
2008-03-02 07:58:42 +00:00
|
|
|
struct cpu_group *top;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check for a fake topology request for debugging purposes.
|
|
|
|
*/
|
|
|
|
switch (smp_topology) {
|
|
|
|
case 1:
|
|
|
|
/* Dual core with no sharing. */
|
|
|
|
top = smp_topo_1level(CG_SHARE_NONE, 2, 0);
|
|
|
|
break;
|
2008-03-10 01:38:53 +00:00
|
|
|
case 2:
|
|
|
|
/* No topology, all cpus are equal. */
|
|
|
|
top = smp_topo_none();
|
|
|
|
break;
|
2008-03-02 07:58:42 +00:00
|
|
|
case 3:
|
|
|
|
/* Dual core with shared L2. */
|
|
|
|
top = smp_topo_1level(CG_SHARE_L2, 2, 0);
|
|
|
|
break;
|
|
|
|
case 4:
|
|
|
|
/* quad core, shared l3 among each package, private l2. */
|
|
|
|
top = smp_topo_1level(CG_SHARE_L3, 4, 0);
|
|
|
|
break;
|
|
|
|
case 5:
|
|
|
|
/* quad core, 2 dualcore parts on each package share l2. */
|
|
|
|
top = smp_topo_2level(CG_SHARE_NONE, 2, CG_SHARE_L2, 2, 0);
|
|
|
|
break;
|
|
|
|
case 6:
|
|
|
|
/* Single-core 2xHTT */
|
|
|
|
top = smp_topo_1level(CG_SHARE_L1, 2, CG_FLAG_HTT);
|
|
|
|
break;
|
|
|
|
case 7:
|
|
|
|
/* quad core with a shared l3, 8 threads sharing L2. */
|
|
|
|
top = smp_topo_2level(CG_SHARE_L3, 4, CG_SHARE_L2, 8,
|
2009-04-29 03:15:43 +00:00
|
|
|
CG_FLAG_SMT);
|
2008-03-02 07:58:42 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Default, ask the system what it wants. */
|
|
|
|
top = cpu_topo();
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Verify the returned topology.
|
|
|
|
*/
|
|
|
|
if (top->cg_count != mp_ncpus)
|
|
|
|
panic("Built bad topology at %p. CPU count %d != %d",
|
|
|
|
top, top->cg_count, mp_ncpus);
|
|
|
|
if (top->cg_mask != all_cpus)
|
|
|
|
panic("Built bad topology at %p. CPU mask 0x%X != 0x%X",
|
|
|
|
top, top->cg_mask, all_cpus);
|
|
|
|
return (top);
|
2003-12-03 14:55:31 +00:00
|
|
|
}
|
2008-03-02 07:58:42 +00:00
|
|
|
|
|
|
|
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 = (1 << mp_ncpus) - 1;
|
|
|
|
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)
|
|
|
|
{
|
|
|
|
cpumask_t mask;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (mask = 0, i = 0; i < count; i++, start++)
|
|
|
|
mask |= (1 << start);
|
|
|
|
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 ((parent->cg_mask & child->cg_mask) != 0)
|
|
|
|
panic("Duplicate children in %p. mask 0x%X child 0x%X",
|
|
|
|
parent, parent->cg_mask, child->cg_mask);
|
|
|
|
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;
|
|
|
|
cpumask_t mask;
|
|
|
|
int children;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
mask = (1 << cpu);
|
|
|
|
cg = top;
|
|
|
|
for (;;) {
|
|
|
|
if ((cg->cg_mask & mask) == 0)
|
|
|
|
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 ((cg->cg_mask & mask) != 0)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
#else /* !SMP */
|
2003-12-03 14:55:31 +00:00
|
|
|
|
2008-05-23 04:05:26 +00:00
|
|
|
void
|
|
|
|
smp_rendezvous_cpus(cpumask_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);
|
|
|
|
}
|
|
|
|
|
2003-12-03 14:55:31 +00:00
|
|
|
void
|
2008-01-02 17:09:15 +00:00
|
|
|
smp_rendezvous(void (*setup_func)(void *),
|
|
|
|
void (*action_func)(void *),
|
|
|
|
void (*teardown_func)(void *),
|
2003-12-03 14:55:31 +00:00
|
|
|
void *arg)
|
|
|
|
{
|
|
|
|
|
|
|
|
if (setup_func != NULL)
|
|
|
|
setup_func(arg);
|
|
|
|
if (action_func != NULL)
|
|
|
|
action_func(arg);
|
|
|
|
if (teardown_func != NULL)
|
|
|
|
teardown_func(arg);
|
|
|
|
}
|
2008-03-02 07:58:42 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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,
|
2008-03-16 10:58:09 +00:00
|
|
|
mp_setvariables_for_up, NULL);
|
2003-12-03 14:55:31 +00:00
|
|
|
#endif /* SMP */
|
2008-05-23 04:05:26 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
smp_no_rendevous_barrier(void *dummy)
|
|
|
|
{
|
|
|
|
#ifdef SMP
|
|
|
|
KASSERT((!smp_started),("smp_no_rendevous called and smp is started"));
|
|
|
|
#endif
|
|
|
|
}
|