The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/beri/beri_mp.c

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    1 /*-
    2  * Copyright (c) 2017 Ruslan Bukin <br@bsdpad.com>
    3  * Copyright (c) 2012-2015 Robert N. M. Watson
    4  * Copyright (c) 2013 SRI International
    5  * All rights reserved.
    6  *
    7  * This software was developed by SRI International and the University of
    8  * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
    9  * ("CTSRD"), as part of the DARPA CRASH research programme.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/12.0/sys/mips/beri/beri_mp.c 332441 2018-04-12 17:43:19Z br $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/smp.h>
   39 
   40 #include <machine/hwfunc.h>
   41 #include <machine/smp.h>
   42 
   43 #include <mips/beri/beri_mp.h>
   44 
   45 #include <dev/fdt/fdt_common.h>
   46 
   47 struct spin_entry {
   48         uint64_t entry_addr;
   49         uint64_t a0;
   50         uint32_t rsvd1;
   51         uint32_t pir;
   52         uint64_t rsvd2;
   53 };
   54 
   55 static phandle_t cpu_of_nodes[MAXCPU];
   56 static device_t picmap[MAXCPU];
   57 
   58 int
   59 platform_processor_id(void)
   60 {
   61         int cpu;
   62 
   63         cpu = beri_get_cpu();
   64 
   65         return (cpu);
   66 }
   67 
   68 void
   69 platform_cpu_mask(cpuset_t *mask)
   70 {
   71         int ncores, ncpus, nthreads;
   72         phandle_t cpus, cpu;
   73         pcell_t reg;
   74         char prop[16];
   75         struct spin_entry *se;
   76 
   77         ncores = beri_get_ncores();
   78         nthreads = beri_get_nthreads();
   79         KASSERT(ncores <= 0x10000, ("%s: too many cores %d", __func__, ncores));
   80         KASSERT(nthreads <= 0x10000, ("%s: too many threads %d", __func__,
   81             nthreads));
   82         KASSERT(ncores < 0xffff || nthreads < 0xffff,
   83             ("%s: cores x thread (%d x %d) would overflow", __func__, ncores,
   84             nthreads));
   85         ncpus = ncores * nthreads;
   86         if (MAXCPU > 1 && ncpus > MAXCPU)
   87                 printf("%s: Hardware supports more CPUs (%d) than kernel (%d)\n",
   88                     __func__, ncpus, MAXCPU);
   89         printf("%s: hardware has %d cores with %d threads each\n", __func__,
   90             ncores, nthreads);
   91 
   92         if ((cpus = OF_finddevice("/cpus")) <= 0) {
   93                 printf("%s: no \"/cpus\" device found in FDT\n", __func__);
   94                 goto error;
   95         }
   96         if ((cpu = OF_child(cpus)) <= 0) {
   97                 printf("%s: no children of \"/cpus\" found in FDT\n", __func__);
   98                 goto error;
   99         }
  100         CPU_ZERO(mask);
  101         do {
  102                 if (OF_getprop(cpu, "reg", &reg, sizeof(reg)) <= 0) {
  103                         printf("%s: cpu device with no reg property\n",
  104                             __func__);
  105                         goto error;
  106                 }
  107                 if (reg > MAXCPU) {
  108                         printf("%s: cpu ID too large (%d > %d)\n", __func__,
  109                             reg, MAXCPU);
  110                         continue;
  111                 }
  112                 cpu_of_nodes[reg] = cpu;
  113 
  114                 if (reg != 0) {
  115                         if (OF_getprop(cpu, "enable-method", &prop,
  116                             sizeof(prop)) <= 0 && OF_getprop(OF_parent(cpu),
  117                             "enable-method", &prop, sizeof(prop)) <= 0) {
  118                                 printf("%s: CPU %d has no enable-method "
  119                                     "property\n", __func__, reg);
  120                                 continue;
  121                         }
  122                         if (strcmp("spin-table", prop) != 0) {
  123                                 printf("%s: CPU %d enable-method is '%s' not "
  124                                     "'spin-table'\n", __func__, reg, prop);
  125                                 continue;
  126                         }
  127 
  128                         if (OF_getprop(cpu, "cpu-release-addr", &se,
  129                             sizeof(se)) <= 0) {
  130                                 printf("%s: CPU %d has missing or invalid "
  131                                     "cpu-release-addr\n", __func__, reg);
  132                                 continue;
  133                         }
  134                         if (se->entry_addr != 1) {
  135                                 printf("%s: CPU %d has uninitalized spin "
  136                                     "entry\n", __func__, reg);
  137                                 continue;
  138                         }
  139                 }
  140 
  141                 CPU_SET(reg, mask);
  142         } while ((cpu = OF_peer(cpu)) > 0);
  143         return;
  144 
  145 error:
  146         /*
  147          * If we run into any problems determining the CPU layout,
  148          * fall back to UP.
  149          *
  150          * XXX: panic instead?
  151          */
  152         CPU_ZERO(mask);
  153         CPU_SET(0, mask);
  154 }
  155 
  156 void
  157 platform_init_secondary(int cpuid)
  158 {
  159         device_t ic;
  160         int ipi;
  161 
  162         ipi = platform_ipi_hardintr_num();
  163 
  164         ic = devclass_get_device(devclass_find("beripic"), cpuid);
  165         picmap[cpuid] = ic;
  166         beripic_setup_ipi(ic, cpuid, ipi);
  167 
  168         /* Unmask the interrupt */
  169         if (cpuid != 0) {
  170                 mips_wr_status(mips_rd_status() | (((1 << ipi) << 8) << 2));
  171         }
  172 }
  173 
  174 
  175 void
  176 platform_ipi_send(int cpuid)
  177 {
  178 
  179         mips_sync();    /* Ordering, liveness. */
  180 
  181         beripic_send_ipi(picmap[cpuid], cpuid);
  182 }
  183 
  184 void
  185 platform_ipi_clear(void)
  186 {
  187         int cpuid;
  188 
  189         cpuid = platform_processor_id();
  190 
  191         beripic_clear_ipi(picmap[cpuid], cpuid);
  192 }
  193 
  194 /*
  195  * XXXBED: Set via FDT?
  196  */
  197 int
  198 platform_ipi_hardintr_num(void)
  199 {
  200 
  201         return (4);
  202 }
  203 
  204 int
  205 platform_ipi_softintr_num(void)
  206 {
  207 
  208         return (-1);
  209 }
  210 
  211 /*
  212  * XXXBED: Fine for MT, will need something better for multi-core.
  213  */
  214 struct cpu_group *
  215 platform_smp_topo(void)
  216 {
  217 
  218         return (smp_topo_none());
  219 }
  220 
  221 void
  222 platform_init_ap(int cpuid)
  223 {
  224         uint32_t status;
  225         u_int clock_int_mask;
  226 
  227         KASSERT(cpuid < MAXCPU, ("%s: invalid CPU id %d", __func__, cpuid));
  228 
  229         /* Make sure coprocessors are enabled. */
  230         status = mips_rd_status();
  231         status |= (MIPS_SR_COP_0_BIT | MIPS_SR_COP_1_BIT);
  232 #if defined(CPU_CHERI)
  233         status |= MIPS_SR_COP_2_BIT;
  234 #endif
  235         mips_wr_status(status);
  236 
  237 #if 0
  238         register_t hwrena;
  239         /* Enable HDWRD instruction in userspace. Also enables statcounters. */
  240         hwrena = mips_rd_hwrena();
  241         hwrena |= (MIPS_HWRENA_CC | MIPS_HWRENA_CCRES | MIPS_HWRENA_CPUNUM |
  242             MIPS_HWRENA_BERI_STATCOUNTERS_MASK);
  243         mips_wr_hwrena(hwrena);
  244 #endif
  245 
  246         /*
  247          * Enable per-thread timer.
  248          */
  249         clock_int_mask = hard_int_mask(5);
  250         set_intr_mask(clock_int_mask);
  251 }
  252 
  253 /*
  254  * BERI startup conforms to the spin-table start method defined in the
  255  * ePAPR 1.0 spec.  The initial spin waiting for an address is started
  256  * by the CPU firmware.
  257  */
  258 int
  259 platform_start_ap(int cpuid)
  260 {
  261         phandle_t cpu;
  262         char prop[16];
  263         struct spin_entry *se;
  264 
  265         KASSERT(cpuid != 0, ("%s: can't start CPU 0!\n", __func__));
  266         KASSERT((cpuid > 0 && cpuid < MAXCPU),
  267             ("%s: invalid CPU id %d", __func__, cpuid));
  268 
  269         cpu = cpu_of_nodes[cpuid];
  270         if (OF_getprop(cpu, "status", &prop, sizeof(prop)) <= 0) {
  271                 if (bootverbose)
  272                         printf("%s: CPU %d has no status property, "
  273                             "trying parent\n", __func__, cpuid);
  274                 if (OF_getprop(OF_parent(cpu), "status", &prop,
  275                     sizeof(prop)) <= 0)
  276                         panic("%s: CPU %d has no status property", __func__,
  277                             cpuid);
  278         }
  279         if (strcmp("disabled", prop) != 0)
  280                 panic("%s: CPU %d status is '%s' not 'disabled'",
  281                     __func__, cpuid, prop);
  282 
  283         if (OF_getprop(cpu, "enable-method", &prop, sizeof(prop)) <= 0) {
  284                 if (bootverbose)
  285                         printf("%s: CPU %d has no enable-method, "
  286                             "trying parent\n", __func__, cpuid);
  287                 if (OF_getprop(OF_parent(cpu), "enable-method", &prop,
  288                     sizeof(prop)) <= 0)
  289                         panic("%s: CPU %d has no enable-method property",
  290                             __func__, cpuid);
  291         }
  292         if (strcmp("spin-table", prop) != 0)
  293                 panic("%s: CPU %d enable-method is '%s' not "
  294                     "'spin-table'", __func__, cpuid, prop);
  295 
  296         if (OF_getprop(cpu, "cpu-release-addr", &se, sizeof(se)) <= 0)
  297                 panic("%s: CPU %d has missing or invalid cpu-release-addr",
  298                     __func__, cpuid);
  299         se->pir = cpuid;
  300         if (bootverbose)
  301                 printf("%s: writing %p to %p\n", __func__, mpentry,
  302                     &se->entry_addr);
  303 
  304         mips_sync();    /* Ordering. */
  305         se->entry_addr = (intptr_t)mpentry;
  306         mips_sync();    /* Liveness. */
  307 
  308         return (0);
  309 }

Cache object: 8a24a3b050b98114dcb79b723c30eb82


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