493 lines
11 KiB
C
493 lines
11 KiB
C
/* $NetBSD: kern_cpu.c,v 1.44 2010/04/25 15:57:59 ad Exp $ */
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/*-
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* Copyright (c) 2007, 2008, 2009, 2010 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c)2007 YAMAMOTO Takashi,
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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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*
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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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kern_cpu.c,v 1.44 2010/04/25 15:57:59 ad Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/idle.h>
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#include <sys/sched.h>
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#include <sys/intr.h>
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#include <sys/conf.h>
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#include <sys/cpu.h>
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#include <sys/cpuio.h>
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#include <sys/proc.h>
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#include <sys/percpu.h>
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#include <sys/kernel.h>
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#include <sys/kauth.h>
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#include <sys/xcall.h>
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#include <sys/pool.h>
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#include <sys/kmem.h>
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#include <sys/select.h>
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#include <sys/namei.h>
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#include <sys/callout.h>
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#include <uvm/uvm_extern.h>
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void cpuctlattach(int);
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static void cpu_xc_online(struct cpu_info *);
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static void cpu_xc_offline(struct cpu_info *);
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dev_type_ioctl(cpuctl_ioctl);
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const struct cdevsw cpuctl_cdevsw = {
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nullopen, nullclose, nullread, nullwrite, cpuctl_ioctl,
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nullstop, notty, nopoll, nommap, nokqfilter,
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D_OTHER | D_MPSAFE
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};
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kmutex_t cpu_lock;
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int ncpu;
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int ncpuonline;
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bool mp_online;
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struct cpuqueue cpu_queue = CIRCLEQ_HEAD_INITIALIZER(cpu_queue);
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static struct cpu_info **cpu_infos;
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int
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mi_cpu_attach(struct cpu_info *ci)
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{
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int error;
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KASSERT(maxcpus > 0);
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ci->ci_index = ncpu;
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CIRCLEQ_INSERT_TAIL(&cpu_queue, ci, ci_data.cpu_qchain);
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TAILQ_INIT(&ci->ci_data.cpu_ld_locks);
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__cpu_simple_lock_init(&ci->ci_data.cpu_ld_lock);
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/* This is useful for eg, per-cpu evcnt */
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snprintf(ci->ci_data.cpu_name, sizeof(ci->ci_data.cpu_name), "cpu%d",
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cpu_index(ci));
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sched_cpuattach(ci);
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error = create_idle_lwp(ci);
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if (error != 0) {
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/* XXX revert sched_cpuattach */
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return error;
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}
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if (ci == curcpu())
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ci->ci_data.cpu_onproc = curlwp;
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else
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ci->ci_data.cpu_onproc = ci->ci_data.cpu_idlelwp;
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percpu_init_cpu(ci);
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softint_init(ci);
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callout_init_cpu(ci);
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xc_init_cpu(ci);
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pool_cache_cpu_init(ci);
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selsysinit(ci);
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cache_cpu_init(ci);
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TAILQ_INIT(&ci->ci_data.cpu_biodone);
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ncpu++;
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ncpuonline++;
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if (cpu_infos == NULL) {
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cpu_infos =
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kmem_zalloc(sizeof(cpu_infos[0]) * maxcpus, KM_SLEEP);
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}
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cpu_infos[cpu_index(ci)] = ci;
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return 0;
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}
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void
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cpuctlattach(int dummy)
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{
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KASSERT(cpu_infos != NULL);
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}
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int
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cpuctl_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l)
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{
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CPU_INFO_ITERATOR cii;
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cpustate_t *cs;
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struct cpu_info *ci;
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int error, i;
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u_int id;
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error = 0;
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mutex_enter(&cpu_lock);
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switch (cmd) {
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case IOC_CPU_SETSTATE:
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if (error == 0)
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cs = data;
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error = kauth_authorize_system(l->l_cred,
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KAUTH_SYSTEM_CPU, KAUTH_REQ_SYSTEM_CPU_SETSTATE, cs, NULL,
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NULL);
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if (error != 0)
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break;
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if (cs->cs_id >= maxcpus ||
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(ci = cpu_lookup(cs->cs_id)) == NULL) {
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error = ESRCH;
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break;
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}
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error = cpu_setintr(ci, cs->cs_intr);
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error = cpu_setstate(ci, cs->cs_online);
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break;
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case IOC_CPU_GETSTATE:
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if (error == 0)
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cs = data;
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id = cs->cs_id;
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memset(cs, 0, sizeof(*cs));
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cs->cs_id = id;
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if (cs->cs_id >= maxcpus ||
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(ci = cpu_lookup(id)) == NULL) {
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error = ESRCH;
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break;
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}
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if ((ci->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0)
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cs->cs_online = false;
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else
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cs->cs_online = true;
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if ((ci->ci_schedstate.spc_flags & SPCF_NOINTR) != 0)
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cs->cs_intr = false;
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else
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cs->cs_intr = true;
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cs->cs_lastmod = (int32_t)ci->ci_schedstate.spc_lastmod;
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cs->cs_lastmodhi = (int32_t)
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(ci->ci_schedstate.spc_lastmod >> 32);
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cs->cs_intrcnt = cpu_intr_count(ci) + 1;
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break;
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case IOC_CPU_MAPID:
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i = 0;
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for (CPU_INFO_FOREACH(cii, ci)) {
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if (i++ == *(int *)data)
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break;
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}
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if (ci == NULL)
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error = ESRCH;
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else
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*(int *)data = cpu_index(ci);
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break;
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case IOC_CPU_GETCOUNT:
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*(int *)data = ncpu;
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break;
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default:
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error = ENOTTY;
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break;
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}
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mutex_exit(&cpu_lock);
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return error;
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}
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struct cpu_info *
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cpu_lookup(u_int idx)
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{
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struct cpu_info *ci;
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KASSERT(idx < maxcpus);
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if (__predict_false(cpu_infos == NULL)) {
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KASSERT(idx == 0);
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return curcpu();
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}
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ci = cpu_infos[idx];
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KASSERT(ci == NULL || cpu_index(ci) == idx);
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return ci;
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}
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static void
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cpu_xc_offline(struct cpu_info *ci)
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{
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struct schedstate_percpu *spc, *mspc = NULL;
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struct cpu_info *target_ci;
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struct lwp *l;
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CPU_INFO_ITERATOR cii;
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int s;
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/*
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* Thread that made the cross call (separate context) holds
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* cpu_lock on our behalf.
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*/
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spc = &ci->ci_schedstate;
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s = splsched();
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spc->spc_flags |= SPCF_OFFLINE;
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splx(s);
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/* Take the first available CPU for the migration. */
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for (CPU_INFO_FOREACH(cii, target_ci)) {
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mspc = &target_ci->ci_schedstate;
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if ((mspc->spc_flags & SPCF_OFFLINE) == 0)
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break;
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}
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KASSERT(target_ci != NULL);
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/*
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* Migrate all non-bound threads to the other CPU. Note that this
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* runs from the xcall thread, thus handling of LSONPROC is not needed.
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*/
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mutex_enter(proc_lock);
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LIST_FOREACH(l, &alllwp, l_list) {
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struct cpu_info *mci;
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lwp_lock(l);
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if (l->l_cpu != ci || (l->l_pflag & (LP_BOUND | LP_INTR))) {
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lwp_unlock(l);
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continue;
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}
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/* Normal case - no affinity */
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if ((l->l_flag & LW_AFFINITY) == 0) {
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lwp_migrate(l, target_ci);
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continue;
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}
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/* Affinity is set, find an online CPU in the set */
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KASSERT(l->l_affinity != NULL);
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for (CPU_INFO_FOREACH(cii, mci)) {
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mspc = &mci->ci_schedstate;
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if ((mspc->spc_flags & SPCF_OFFLINE) == 0 &&
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kcpuset_isset(cpu_index(mci), l->l_affinity))
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break;
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}
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if (mci == NULL) {
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lwp_unlock(l);
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mutex_exit(proc_lock);
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goto fail;
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}
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lwp_migrate(l, mci);
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}
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mutex_exit(proc_lock);
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#ifdef __HAVE_MD_CPU_OFFLINE
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cpu_offline_md();
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#endif
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return;
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fail:
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/* Just unset the SPCF_OFFLINE flag, caller will check */
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s = splsched();
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spc->spc_flags &= ~SPCF_OFFLINE;
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splx(s);
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}
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static void
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cpu_xc_online(struct cpu_info *ci)
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{
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struct schedstate_percpu *spc;
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int s;
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spc = &ci->ci_schedstate;
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s = splsched();
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spc->spc_flags &= ~SPCF_OFFLINE;
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splx(s);
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}
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int
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cpu_setstate(struct cpu_info *ci, bool online)
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{
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struct schedstate_percpu *spc;
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CPU_INFO_ITERATOR cii;
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struct cpu_info *ci2;
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uint64_t where;
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xcfunc_t func;
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int nonline;
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spc = &ci->ci_schedstate;
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KASSERT(mutex_owned(&cpu_lock));
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if (online) {
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if ((spc->spc_flags & SPCF_OFFLINE) == 0)
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return 0;
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func = (xcfunc_t)cpu_xc_online;
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ncpuonline++;
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} else {
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if ((spc->spc_flags & SPCF_OFFLINE) != 0)
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return 0;
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nonline = 0;
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/*
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* Ensure that at least one CPU within the processor set
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* stays online. Revisit this later.
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*/
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for (CPU_INFO_FOREACH(cii, ci2)) {
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if ((ci2->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0)
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continue;
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if (ci2->ci_schedstate.spc_psid != spc->spc_psid)
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continue;
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nonline++;
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}
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if (nonline == 1)
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return EBUSY;
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func = (xcfunc_t)cpu_xc_offline;
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ncpuonline--;
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}
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where = xc_unicast(0, func, ci, NULL, ci);
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xc_wait(where);
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if (online) {
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KASSERT((spc->spc_flags & SPCF_OFFLINE) == 0);
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} else if ((spc->spc_flags & SPCF_OFFLINE) == 0) {
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/* If was not set offline, then it is busy */
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return EBUSY;
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}
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spc->spc_lastmod = time_second;
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return 0;
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}
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#ifdef __HAVE_INTR_CONTROL
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static void
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cpu_xc_intr(struct cpu_info *ci)
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{
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struct schedstate_percpu *spc;
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int s;
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spc = &ci->ci_schedstate;
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s = splsched();
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spc->spc_flags &= ~SPCF_NOINTR;
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splx(s);
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}
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static void
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cpu_xc_nointr(struct cpu_info *ci)
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{
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struct schedstate_percpu *spc;
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int s;
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spc = &ci->ci_schedstate;
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s = splsched();
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spc->spc_flags |= SPCF_NOINTR;
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splx(s);
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}
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int
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cpu_setintr(struct cpu_info *ci, bool intr)
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{
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struct schedstate_percpu *spc;
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CPU_INFO_ITERATOR cii;
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struct cpu_info *ci2;
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uint64_t where;
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xcfunc_t func;
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int nintr;
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spc = &ci->ci_schedstate;
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KASSERT(mutex_owned(&cpu_lock));
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if (intr) {
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if ((spc->spc_flags & SPCF_NOINTR) == 0)
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return 0;
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func = (xcfunc_t)cpu_xc_intr;
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} else {
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if ((spc->spc_flags & SPCF_NOINTR) != 0)
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return 0;
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/*
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* Ensure that at least one CPU within the system
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* is handing device interrupts.
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*/
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nintr = 0;
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for (CPU_INFO_FOREACH(cii, ci2)) {
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if ((ci2->ci_schedstate.spc_flags & SPCF_NOINTR) != 0)
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continue;
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if (ci2 == ci)
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continue;
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nintr++;
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}
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if (nintr == 0)
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return EBUSY;
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func = (xcfunc_t)cpu_xc_nointr;
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}
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where = xc_unicast(0, func, ci, NULL, ci);
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xc_wait(where);
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if (intr) {
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KASSERT((spc->spc_flags & SPCF_NOINTR) == 0);
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} else if ((spc->spc_flags & SPCF_NOINTR) == 0) {
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/* If was not set offline, then it is busy */
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return EBUSY;
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}
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/* Direct interrupts away from the CPU and record the change. */
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cpu_intr_redistribute();
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spc->spc_lastmod = time_second;
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return 0;
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}
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#else /* __HAVE_INTR_CONTROL */
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int
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cpu_setintr(struct cpu_info *ci, bool intr)
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{
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return EOPNOTSUPP;
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}
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u_int
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cpu_intr_count(struct cpu_info *ci)
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{
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return 0; /* 0 == "don't know" */
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}
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#endif /* __HAVE_INTR_CONTROL */
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bool
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cpu_softintr_p(void)
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{
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return (curlwp->l_pflag & LP_INTR) != 0;
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}
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