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/lock.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mutex.h>
   41 #include <sys/pcpu.h>
   42 #include <sys/proc.h>
   43 #include <sys/sched.h>
   44 #include <sys/smp.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vm_param.h>
   48 #include <vm/pmap.h>
   49 #include <vm/vm_map.h>
   50 #include <vm/vm_extern.h>
   51 #include <vm/vm_kern.h>
   52 
   53 #include <machine/bus.h>
   54 #include <machine/cpu.h>
   55 #include <machine/intr_machdep.h>
   56 #include <machine/pcb.h>
   57 #include <machine/platform.h>
   58 #include <machine/md_var.h>
   59 #include <machine/setjmp.h>
   60 #include <machine/smp.h>
   61 
   62 #include "pic_if.h"
   63 
   64 volatile static int ap_awake;
   65 volatile static u_int ap_letgo;
   66 volatile static u_quad_t ap_timebase;
   67 static u_int ipi_msg_cnt[32];
   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                 __asm __volatile("or 27,27,27");
   80         __asm __volatile("or 6,6,6");
   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         printf("SMP: AP CPU #%d launched\n", PCPU_GET(cpuid));
  102         mtx_unlock_spin(&ap_boot_mtx);
  103 
  104         while(smp_started == 0)
  105                 ;
  106 
  107         /* Start per-CPU event timers. */
  108         cpu_initclocks_ap();
  109 
  110         /* Announce ourselves awake, and enter the scheduler */
  111         sched_throw(NULL);
  112 }
  113 
  114 void
  115 cpu_mp_setmaxid(void)
  116 {
  117         struct cpuref cpuref;
  118         int error;
  119 
  120         mp_ncpus = 0;
  121         mp_maxid = 0;
  122         error = platform_smp_first_cpu(&cpuref);
  123         while (!error) {
  124                 mp_ncpus++;
  125                 mp_maxid = max(cpuref.cr_cpuid, mp_maxid);
  126                 error = platform_smp_next_cpu(&cpuref);
  127         }
  128         /* Sanity. */
  129         if (mp_ncpus == 0)
  130                 mp_ncpus = 1;
  131 }
  132 
  133 int
  134 cpu_mp_probe(void)
  135 {
  136 
  137         /*
  138          * We're not going to enable SMP if there's only 1 processor.
  139          */
  140         return (mp_ncpus > 1);
  141 }
  142 
  143 void
  144 cpu_mp_start(void)
  145 {
  146         struct cpuref bsp, cpu;
  147         struct pcpu *pc;
  148         int error;
  149 
  150         error = platform_smp_get_bsp(&bsp);
  151         KASSERT(error == 0, ("Don't know BSP"));
  152 
  153         error = platform_smp_first_cpu(&cpu);
  154         while (!error) {
  155                 if (cpu.cr_cpuid >= MAXCPU) {
  156                         printf("SMP: cpu%d: skipped -- ID out of range\n",
  157                             cpu.cr_cpuid);
  158                         goto next;
  159                 }
  160                 if (CPU_ISSET(cpu.cr_cpuid, &all_cpus)) {
  161                         printf("SMP: cpu%d: skipped - duplicate ID\n",
  162                             cpu.cr_cpuid);
  163                         goto next;
  164                 }
  165                 if (cpu.cr_cpuid != bsp.cr_cpuid) {
  166                         void *dpcpu;
  167 
  168                         pc = &__pcpu[cpu.cr_cpuid];
  169                         dpcpu = (void *)kmem_malloc(DPCPU_SIZE, M_WAITOK |
  170                             M_ZERO);
  171                         pcpu_init(pc, cpu.cr_cpuid, sizeof(*pc));
  172                         dpcpu_init(dpcpu, cpu.cr_cpuid);
  173                 } else {
  174                         pc = pcpup;
  175                         pc->pc_cpuid = bsp.cr_cpuid;
  176                         pc->pc_bsp = 1;
  177                 }
  178                 pc->pc_hwref = cpu.cr_hwref;
  179                 CPU_SET(pc->pc_cpuid, &all_cpus);
  180 next:
  181                 error = platform_smp_next_cpu(&cpu);
  182         }
  183 
  184 #ifdef SMP
  185         platform_smp_probe_threads();
  186 #endif
  187 }
  188 
  189 void
  190 cpu_mp_announce(void)
  191 {
  192         struct pcpu *pc;
  193         int i;
  194 
  195         if (!bootverbose)
  196                 return;
  197 
  198         CPU_FOREACH(i) {
  199                 pc = pcpu_find(i);
  200                 if (pc == NULL)
  201                         continue;
  202                 printf("cpu%d: dev=%x", i, (int)pc->pc_hwref);
  203                 if (pc->pc_bsp)
  204                         printf(" (BSP)");
  205                 printf("\n");
  206         }
  207 }
  208 
  209 static void
  210 cpu_mp_unleash(void *dummy)
  211 {
  212         struct pcpu *pc;
  213         int cpus, timeout;
  214         int ret;
  215 
  216         if (mp_ncpus <= 1)
  217                 return;
  218 
  219         mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
  220 
  221         cpus = 0;
  222         smp_cpus = 0;
  223 #ifdef BOOKE
  224         tlb1_ap_prep();
  225 #endif
  226         STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
  227                 cpus++;
  228                 if (!pc->pc_bsp) {
  229                         if (bootverbose)
  230                                 printf("Waking up CPU %d (dev=%x)\n",
  231                                     pc->pc_cpuid, (int)pc->pc_hwref);
  232 
  233                         ret = platform_smp_start_cpu(pc);
  234                         if (ret == 0) {
  235                                 timeout = 2000; /* wait 2sec for the AP */
  236                                 while (!pc->pc_awake && --timeout > 0)
  237                                         DELAY(1000);
  238                         }
  239                 } else {
  240                         pc->pc_awake = 1;
  241                 }
  242                 if (pc->pc_awake) {
  243                         if (bootverbose)
  244                                 printf("Adding CPU %d, hwref=%jx, awake=%x\n",
  245                                     pc->pc_cpuid, (uintmax_t)pc->pc_hwref,
  246                                     pc->pc_awake);
  247                         smp_cpus++;
  248                 } else
  249                         CPU_SET(pc->pc_cpuid, &stopped_cpus);
  250         }
  251 
  252         ap_awake = 1;
  253 
  254         /* Provide our current DEC and TB values for APs */
  255         ap_timebase = mftb() + 10;
  256         __asm __volatile("msync; isync");
  257         
  258         /* Let APs continue */
  259         atomic_store_rel_int(&ap_letgo, 1);
  260 
  261         platform_smp_timebase_sync(ap_timebase, 0);
  262 
  263         while (ap_awake < smp_cpus)
  264                 ;
  265 
  266         if (smp_cpus != cpus || cpus != mp_ncpus) {
  267                 printf("SMP: %d CPUs found; %d CPUs usable; %d CPUs woken\n",
  268                     mp_ncpus, cpus, smp_cpus);
  269         }
  270 
  271         if (smp_cpus > 1)
  272                 atomic_store_rel_int(&smp_started, 1);
  273 
  274         /* Let the APs get into the scheduler */
  275         DELAY(10000);
  276 
  277 }
  278 
  279 SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, cpu_mp_unleash, NULL);
  280 
  281 int
  282 powerpc_ipi_handler(void *arg)
  283 {
  284         u_int cpuid;
  285         uint32_t ipimask;
  286         int msg;
  287 
  288         CTR2(KTR_SMP, "%s: MSR 0x%08x", __func__, mfmsr());
  289 
  290         ipimask = atomic_readandclear_32(&(pcpup->pc_ipimask));
  291         if (ipimask == 0)
  292                 return (FILTER_STRAY);
  293         while ((msg = ffs(ipimask) - 1) != -1) {
  294                 ipimask &= ~(1u << msg);
  295                 ipi_msg_cnt[msg]++;
  296                 switch (msg) {
  297                 case IPI_AST:
  298                         CTR1(KTR_SMP, "%s: IPI_AST", __func__);
  299                         break;
  300                 case IPI_PREEMPT:
  301                         CTR1(KTR_SMP, "%s: IPI_PREEMPT", __func__);
  302                         sched_preempt(curthread);
  303                         break;
  304                 case IPI_RENDEZVOUS:
  305                         CTR1(KTR_SMP, "%s: IPI_RENDEZVOUS", __func__);
  306                         smp_rendezvous_action();
  307                         break;
  308                 case IPI_STOP:
  309 
  310                         /*
  311                          * IPI_STOP_HARD is mapped to IPI_STOP so it is not
  312                          * necessary to add such case in the switch.
  313                          */
  314                         CTR1(KTR_SMP, "%s: IPI_STOP or IPI_STOP_HARD (stop)",
  315                             __func__);
  316                         cpuid = PCPU_GET(cpuid);
  317                         savectx(&stoppcbs[cpuid]);
  318                         savectx(PCPU_GET(curpcb));
  319                         CPU_SET_ATOMIC(cpuid, &stopped_cpus);
  320                         while (!CPU_ISSET(cpuid, &started_cpus))
  321                                 cpu_spinwait();
  322                         CPU_CLR_ATOMIC(cpuid, &stopped_cpus);
  323                         CPU_CLR_ATOMIC(cpuid, &started_cpus);
  324                         CTR1(KTR_SMP, "%s: IPI_STOP (restart)", __func__);
  325                         break;
  326                 case IPI_HARDCLOCK:
  327                         CTR1(KTR_SMP, "%s: IPI_HARDCLOCK", __func__);
  328                         hardclockintr();
  329                         break;
  330                 }
  331         }
  332 
  333         return (FILTER_HANDLED);
  334 }
  335 
  336 static void
  337 ipi_send(struct pcpu *pc, int ipi)
  338 {
  339 
  340         CTR4(KTR_SMP, "%s: pc=%p, targetcpu=%d, IPI=%d", __func__,
  341             pc, pc->pc_cpuid, ipi);
  342 
  343         atomic_set_32(&pc->pc_ipimask, (1 << ipi));
  344         powerpc_sync();
  345         PIC_IPI(root_pic, pc->pc_cpuid);
  346 
  347         CTR1(KTR_SMP, "%s: sent", __func__);
  348 }
  349 
  350 /* Send an IPI to a set of cpus. */
  351 void
  352 ipi_selected(cpuset_t cpus, int ipi)
  353 {
  354         struct pcpu *pc;
  355 
  356         STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
  357                 if (CPU_ISSET(pc->pc_cpuid, &cpus))
  358                         ipi_send(pc, ipi);
  359         }
  360 }
  361 
  362 /* Send an IPI to a specific CPU. */
  363 void
  364 ipi_cpu(int cpu, u_int ipi)
  365 {
  366 
  367         ipi_send(cpuid_to_pcpu[cpu], ipi);
  368 }
  369 
  370 /* Send an IPI to all CPUs EXCEPT myself. */
  371 void
  372 ipi_all_but_self(int ipi)
  373 {
  374         struct pcpu *pc;
  375 
  376         STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
  377                 if (pc != pcpup)
  378                         ipi_send(pc, ipi);
  379         }
  380 }
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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
