mp_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2008 Marcel Moolenaar
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/ktr.h>
   36 #include <sys/bus.h>
   37 #include <sys/cpuset.h>
   38 #include <sys/domainset.h>
   39 #include <sys/lock.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mutex.h>
   42 #include <sys/pcpu.h>
   43 #include <sys/proc.h>
   44 #include <sys/sched.h>
   45 #include <sys/smp.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vm_param.h>
   49 #include <vm/pmap.h>
   50 #include <vm/vm_map.h>
   51 #include <vm/vm_extern.h>
   52 #include <vm/vm_kern.h>
   53 
   54 #include <machine/bus.h>
   55 #include <machine/cpu.h>
   56 #include <machine/intr_machdep.h>
   57 #include <machine/pcb.h>
   58 #include <machine/platform.h>
   59 #include <machine/md_var.h>
   60 #include <machine/setjmp.h>
   61 #include <machine/smp.h>
   62 
   63 #include "pic_if.h"
   64 
   65 volatile static int ap_awake;
   66 volatile static u_int ap_letgo;
   67 volatile static u_quad_t ap_timebase;
   68 static struct mtx ap_boot_mtx;
   69 struct pcb stoppcbs[MAXCPU];
   70 
   71 void
   72 machdep_ap_bootstrap(void)
   73 {
   74 
   75         PCPU_SET(awake, 1);
   76         __asm __volatile("msync; isync");
   77 
   78         while (ap_letgo == 0)
   79                 nop_prio_vlow();
   80         nop_prio_medium();
   81 
   82         /*
   83          * Set timebase as soon as possible to meet an implicit rendezvous
   84          * from cpu_mp_unleash(), which sets ap_letgo and then immediately
   85          * sets timebase.
   86          *
   87          * Note that this is instrinsically racy and is only relevant on
   88          * platforms that do not support better mechanisms.
   89          */
   90         platform_smp_timebase_sync(ap_timebase, 1);
   91 
   92         /* Give platform code a chance to do anything else necessary */
   93         platform_smp_ap_init();
   94 
   95         /* Initialize decrementer */
   96         decr_ap_init();
   97 
   98         /* Serialize console output and AP count increment */
   99         mtx_lock_spin(&ap_boot_mtx);
  100         ap_awake++;
  101         if (bootverbose)
  102                 printf("SMP: AP CPU #%d launched\n", PCPU_GET(cpuid));
  103         else
  104                 printf("%s%d%s", ap_awake == 2 ? "Launching APs: " : "",
  105                     PCPU_GET(cpuid), ap_awake == mp_ncpus ? "\n" : " ");
  106         mtx_unlock_spin(&ap_boot_mtx);
  107 
  108         while(smp_started == 0)
  109                 ;
  110 
  111         /* Start per-CPU event timers. */
  112         cpu_initclocks_ap();
  113 
  114         /* Announce ourselves awake, and enter the scheduler */
  115         sched_ap_entry();
  116 }
  117 
  118 void
  119 cpu_mp_setmaxid(void)
  120 {
  121         struct cpuref cpuref;
  122         int error;
  123 
  124         mp_ncpus = 0;
  125         mp_maxid = 0;
  126         error = platform_smp_first_cpu(&cpuref);
  127         while (!error) {
  128                 mp_ncpus++;
  129                 mp_maxid = max(cpuref.cr_cpuid, mp_maxid);
  130                 error = platform_smp_next_cpu(&cpuref);
  131         }
  132         /* Sanity. */
  133         if (mp_ncpus == 0)
  134                 mp_ncpus = 1;
  135 }
  136 
  137 int
  138 cpu_mp_probe(void)
  139 {
  140 
  141         /*
  142          * We're not going to enable SMP if there's only 1 processor.
  143          */
  144         return (mp_ncpus > 1);
  145 }
  146 
  147 void
  148 cpu_mp_start(void)
  149 {
  150         struct cpuref bsp, cpu;
  151         struct pcpu *pc;
  152         int domain, error;
  153 
  154         error = platform_smp_get_bsp(&bsp);
  155         KASSERT(error == 0, ("Don't know BSP"));
  156 
  157         error = platform_smp_first_cpu(&cpu);
  158         while (!error) {
  159                 if (cpu.cr_cpuid >= MAXCPU) {
  160                         printf("SMP: cpu%d: skipped -- ID out of range\n",
  161                             cpu.cr_cpuid);
  162                         goto next;
  163                 }
  164                 if (CPU_ISSET(cpu.cr_cpuid, &all_cpus)) {
  165                         printf("SMP: cpu%d: skipped - duplicate ID\n",
  166                             cpu.cr_cpuid);
  167                         goto next;
  168                 }
  169 
  170                 if (vm_ndomains > 1)
  171                         domain = cpu.cr_domain;
  172                 else
  173                         domain = 0;
  174 
  175                 if (cpu.cr_cpuid != bsp.cr_cpuid) {
  176                         void *dpcpu;
  177 
  178                         pc = &__pcpu[cpu.cr_cpuid];
  179                         dpcpu = kmem_malloc_domainset(DOMAINSET_PREF(domain),
  180                             DPCPU_SIZE, M_WAITOK | M_ZERO);
  181                         pcpu_init(pc, cpu.cr_cpuid, sizeof(*pc));
  182                         dpcpu_init(dpcpu, cpu.cr_cpuid);
  183                 } else {
  184                         pc = pcpup;
  185                         pc->pc_cpuid = bsp.cr_cpuid;
  186                         pc->pc_bsp = 1;
  187                 }
  188                 pc->pc_domain = domain;
  189                 pc->pc_hwref = cpu.cr_hwref;
  190 
  191                 CPU_SET(pc->pc_cpuid, &cpuset_domain[pc->pc_domain]);
  192                 KASSERT(pc->pc_domain < MAXMEMDOM, ("bad domain value %d\n",
  193                     pc->pc_domain));
  194                 CPU_SET(pc->pc_cpuid, &all_cpus);
  195 next:
  196                 error = platform_smp_next_cpu(&cpu);
  197         }
  198 
  199 #ifdef SMP
  200         platform_smp_probe_threads();
  201 #endif
  202 }
  203 
  204 void
  205 cpu_mp_announce(void)
  206 {
  207         struct pcpu *pc;
  208         int i;
  209 
  210         if (!bootverbose)
  211                 return;
  212 
  213         CPU_FOREACH(i) {
  214                 pc = pcpu_find(i);
  215                 if (pc == NULL)
  216                         continue;
  217                 printf("cpu%d: dev=%x domain=%d ", i, (int)pc->pc_hwref, pc->pc_domain);
  218                 if (pc->pc_bsp)
  219                         printf(" (BSP)");
  220                 printf("\n");
  221         }
  222 }
  223 
  224 static void
  225 cpu_mp_unleash(void *dummy)
  226 {
  227         struct pcpu *pc;
  228         int cpus, timeout;
  229         int ret;
  230 
  231         if (mp_ncpus <= 1)
  232                 return;
  233 
  234         mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
  235 
  236         cpus = 0;
  237         smp_cpus = 0;
  238 #ifdef BOOKE
  239         tlb1_ap_prep();
  240 #endif
  241         STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
  242                 cpus++;
  243                 if (!pc->pc_bsp) {
  244                         if (bootverbose)
  245                                 printf("Waking up CPU %d (dev=%x)\n",
  246                                     pc->pc_cpuid, (int)pc->pc_hwref);
  247 
  248                         pc->pc_flags = PCPU_GET(flags); /* Copy cached CPU flags */
  249                         ret = platform_smp_start_cpu(pc);
  250                         if (ret == 0) {
  251                                 timeout = 2000; /* wait 2sec for the AP */
  252                                 while (!pc->pc_awake && --timeout > 0)
  253                                         DELAY(1000);
  254                         }
  255                 } else {
  256                         pc->pc_awake = 1;
  257                 }
  258                 if (pc->pc_awake) {
  259                         if (bootverbose)
  260                                 printf("Adding CPU %d, hwref=%jx, awake=%x\n",
  261                                     pc->pc_cpuid, (uintmax_t)pc->pc_hwref,
  262                                     pc->pc_awake);
  263                         smp_cpus++;
  264                 } else
  265                         CPU_SET(pc->pc_cpuid, &stopped_cpus);
  266         }
  267 
  268         ap_awake = 1;
  269 
  270         /* Provide our current DEC and TB values for APs */
  271         ap_timebase = mftb() + 10;
  272         __asm __volatile("msync; isync");
  273 
  274         /* Let APs continue */
  275         atomic_store_rel_int(&ap_letgo, 1);
  276 
  277         platform_smp_timebase_sync(ap_timebase, 0);
  278 
  279         while (ap_awake < smp_cpus)
  280                 ;
  281 
  282         if (smp_cpus != cpus || cpus != mp_ncpus) {
  283                 printf("SMP: %d CPUs found; %d CPUs usable; %d CPUs woken\n",
  284                     mp_ncpus, cpus, smp_cpus);
  285         }
  286 
  287         if (smp_cpus > 1)
  288                 atomic_store_rel_int(&smp_started, 1);
  289 
  290         /* Let the APs get into the scheduler */
  291         DELAY(10000);
  292 
  293 }
  294 
  295 SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, cpu_mp_unleash, NULL);
  296 
  297 int
  298 powerpc_ipi_handler(void *arg)
  299 {
  300         u_int cpuid;
  301         uint32_t ipimask;
  302 
  303         CTR2(KTR_SMP, "%s: MSR 0x%08x", __func__, mfmsr());
  304 
  305         ipimask = atomic_readandclear_32(&(pcpup->pc_ipimask));
  306         if (ipimask == 0)
  307                 return (FILTER_STRAY);
  308         if (ipimask & (1 << IPI_AST)) {
  309                 CTR1(KTR_SMP, "%s: IPI_AST", __func__);
  310         }
  311         if (ipimask & (1 << IPI_PREEMPT)) {
  312                 CTR1(KTR_SMP, "%s: IPI_PREEMPT", __func__);
  313                 sched_preempt(curthread);
  314         }
  315         if (ipimask & (1 << IPI_RENDEZVOUS)) {
  316                 CTR1(KTR_SMP, "%s: IPI_RENDEZVOUS", __func__);
  317                 smp_rendezvous_action();
  318         }
  319         if (ipimask & (1 << IPI_STOP)) {
  320 
  321                 /*
  322                  * IPI_STOP_HARD is mapped to IPI_STOP so it is not
  323                  * necessary to add such case.
  324                  */
  325                 CTR1(KTR_SMP, "%s: IPI_STOP or IPI_STOP_HARD (stop)",
  326                                 __func__);
  327                 cpuid = PCPU_GET(cpuid);
  328                 savectx(&stoppcbs[cpuid]);
  329                 CPU_SET_ATOMIC(cpuid, &stopped_cpus);
  330                 while (!CPU_ISSET(cpuid, &started_cpus))
  331                         cpu_spinwait();
  332                 CPU_CLR_ATOMIC(cpuid, &stopped_cpus);
  333                 CPU_CLR_ATOMIC(cpuid, &started_cpus);
  334                 CTR1(KTR_SMP, "%s: IPI_STOP (restart)", __func__);
  335         }
  336         if (ipimask & (1 << IPI_HARDCLOCK)) {
  337                 CTR1(KTR_SMP, "%s: IPI_HARDCLOCK", __func__);
  338                 hardclockintr();
  339         }
  340 
  341         return (FILTER_HANDLED);
  342 }
  343 
  344 static void
  345 ipi_send(struct pcpu *pc, int ipi)
  346 {
  347 
  348         CTR4(KTR_SMP, "%s: pc=%p, targetcpu=%d, IPI=%d", __func__,
  349             pc, pc->pc_cpuid, ipi);
  350 
  351         atomic_set_32(&pc->pc_ipimask, (1 << ipi));
  352         powerpc_sync();
  353         PIC_IPI(root_pic, pc->pc_cpuid);
  354 
  355         CTR1(KTR_SMP, "%s: sent", __func__);
  356 }
  357 
  358 /* Send an IPI to a set of cpus. */
  359 void
  360 ipi_selected(cpuset_t cpus, int ipi)
  361 {
  362         struct pcpu *pc;
  363 
  364         STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
  365                 if (CPU_ISSET(pc->pc_cpuid, &cpus))
  366                         ipi_send(pc, ipi);
  367         }
  368 }
  369 
  370 /* Send an IPI to a specific CPU. */
  371 void
  372 ipi_cpu(int cpu, u_int ipi)
  373 {
  374 
  375         ipi_send(cpuid_to_pcpu[cpu], ipi);
  376 }
  377 
  378 /* Send an IPI to all CPUs EXCEPT myself. */
  379 void
  380 ipi_all_but_self(int ipi)
  381 {
  382         struct pcpu *pc;
  383 
  384         STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
  385                 if (pc != pcpup)
  386                         ipi_send(pc, ipi);
  387         }
  388 }
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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powerpc/mp_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/mp_machdep.c
