virt_mp.c

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    1 /*-
    2  * Copyright (c) 2015 Andrew Turner
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/11.0/sys/arm/qemu/virt_mp.c 296158 2016-02-28 13:43:58Z andrew $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 #include <sys/pcpu.h>
   35 #include <sys/smp.h>
   36 
   37 #include <vm/vm.h>
   38 #include <vm/pmap.h>
   39 
   40 #include <machine/intr.h>
   41 #include <machine/platformvar.h>
   42 #include <machine/smp.h>
   43 
   44 #include <dev/ofw/openfirm.h>
   45 #include <dev/ofw/ofw_cpu.h>
   46 #include <dev/psci/psci.h>
   47 
   48 #include <arm/qemu/virt_mp.h>
   49 
   50 static int running_cpus;
   51 
   52 static boolean_t
   53 virt_maxid(u_int id, phandle_t node, u_int addr_cells, pcell_t *reg)
   54 {
   55 
   56         if (mp_maxid < id)
   57                 mp_maxid = id;
   58 
   59         return (true);
   60 }
   61 
   62 void
   63 virt_mp_setmaxid(platform_t plat)
   64 {
   65 
   66         mp_maxid = PCPU_GET(cpuid);
   67         mp_ncpus = ofw_cpu_early_foreach(virt_maxid, true);
   68         if (mp_ncpus < 1)
   69                 mp_ncpus = 1;
   70         mp_ncpus = MIN(mp_ncpus, MAXCPU);
   71 }
   72 
   73 static boolean_t
   74 virt_start_ap(u_int id, phandle_t node, u_int addr_cells, pcell_t *reg)
   75 {
   76         int err;
   77 
   78         if (running_cpus >= mp_ncpus)
   79                 return (false);
   80         running_cpus++;
   81 
   82         err = psci_cpu_on(*reg, pmap_kextract((vm_offset_t)mpentry), id);
   83 
   84         if (err != PSCI_RETVAL_SUCCESS)
   85                 return (false);
   86 
   87         return (true);
   88 }
   89 
   90 void
   91 virt_mp_start_ap(platform_t plat)
   92 {
   93 
   94         ofw_cpu_early_foreach(virt_start_ap, true);
   95 }

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FreeBSD/Linux Kernel Cross Reference sys/arm/qemu/virt_mp.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/qemu/virt_mp.c