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| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/patm/@/powerpc/powerpc/mp_machdep.c |
/*-
* Copyright (c) 2008 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/powerpc/powerpc/mp_machdep.c 223758 2011-07-04 12:04:52Z attilio $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/bus.h>
#include <sys/cpuset.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/sched.h>
#include <sys/smp.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/intr_machdep.h>
#include <machine/pcb.h>
#include <machine/platform.h>
#include <machine/md_var.h>
#include <machine/smp.h>
#include "pic_if.h"
extern struct pcpu __pcpu[MAXCPU];
volatile static int ap_awake;
volatile static u_int ap_letgo;
volatile static u_quad_t ap_timebase;
static u_int ipi_msg_cnt[32];
static struct mtx ap_boot_mtx;
struct pcb stoppcbs[MAXCPU];
void
machdep_ap_bootstrap(void)
{
/* Set up important bits on the CPU (HID registers, etc.) */
cpudep_ap_setup();
/* Set PIR */
PCPU_SET(pir, mfspr(SPR_PIR));
PCPU_SET(awake, 1);
__asm __volatile("msync; isync");
while (ap_letgo == 0)
;
/* Initialize DEC and TB, sync with the BSP values */
#ifdef __powerpc64__
/* Writing to the time base register is hypervisor-privileged */
if (mfmsr() & PSL_HV)
mttb(ap_timebase);
#else
mttb(ap_timebase);
#endif
decr_ap_init();
/* Serialize console output and AP count increment */
mtx_lock_spin(&ap_boot_mtx);
ap_awake++;
printf("SMP: AP CPU #%d launched\n", PCPU_GET(cpuid));
mtx_unlock_spin(&ap_boot_mtx);
/* Start per-CPU event timers. */
cpu_initclocks_ap();
/* Announce ourselves awake, and enter the scheduler */
sched_throw(NULL);
}
void
cpu_mp_setmaxid(void)
{
struct cpuref cpuref;
int error;
mp_ncpus = 0;
error = platform_smp_first_cpu(&cpuref);
while (!error) {
mp_ncpus++;
error = platform_smp_next_cpu(&cpuref);
}
/* Sanity. */
if (mp_ncpus == 0)
mp_ncpus = 1;
/*
* Set the largest cpuid we're going to use. This is necessary
* for VM initialization.
*/
mp_maxid = min(mp_ncpus, MAXCPU) - 1;
}
int
cpu_mp_probe(void)
{
/*
* We're not going to enable SMP if there's only 1 processor.
*/
return (mp_ncpus > 1);
}
void
cpu_mp_start(void)
{
struct cpuref bsp, cpu;
struct pcpu *pc;
int error;
error = platform_smp_get_bsp(&bsp);
KASSERT(error == 0, ("Don't know BSP"));
KASSERT(bsp.cr_cpuid == 0, ("%s: cpuid != 0", __func__));
error = platform_smp_first_cpu(&cpu);
while (!error) {
if (cpu.cr_cpuid >= MAXCPU) {
printf("SMP: cpu%d: skipped -- ID out of range\n",
cpu.cr_cpuid);
goto next;
}
if (CPU_ISSET(cpu.cr_cpuid, &all_cpus)) {
printf("SMP: cpu%d: skipped - duplicate ID\n",
cpu.cr_cpuid);
goto next;
}
if (cpu.cr_cpuid != bsp.cr_cpuid) {
void *dpcpu;
pc = &__pcpu[cpu.cr_cpuid];
dpcpu = (void *)kmem_alloc(kernel_map, DPCPU_SIZE);
pcpu_init(pc, cpu.cr_cpuid, sizeof(*pc));
dpcpu_init(dpcpu, cpu.cr_cpuid);
} else {
pc = pcpup;
pc->pc_cpuid = bsp.cr_cpuid;
pc->pc_bsp = 1;
}
pc->pc_hwref = cpu.cr_hwref;
CPU_SET(pc->pc_cpuid, &all_cpus);
next:
error = platform_smp_next_cpu(&cpu);
}
}
void
cpu_mp_announce(void)
{
struct pcpu *pc;
int i;
for (i = 0; i <= mp_maxid; i++) {
pc = pcpu_find(i);
if (pc == NULL)
continue;
printf("cpu%d: dev=%x", i, (int)pc->pc_hwref);
if (pc->pc_bsp)
printf(" (BSP)");
printf("\n");
}
}
static void
cpu_mp_unleash(void *dummy)
{
struct pcpu *pc;
int cpus, timeout;
if (mp_ncpus <= 1)
return;
mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
cpus = 0;
smp_cpus = 0;
STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
cpus++;
if (!pc->pc_bsp) {
if (bootverbose)
printf("Waking up CPU %d (dev=%x)\n",
pc->pc_cpuid, (int)pc->pc_hwref);
platform_smp_start_cpu(pc);
timeout = 2000; /* wait 2sec for the AP */
while (!pc->pc_awake && --timeout > 0)
DELAY(1000);
} else {
PCPU_SET(pir, mfspr(SPR_PIR));
pc->pc_awake = 1;
}
if (pc->pc_awake) {
if (bootverbose)
printf("Adding CPU %d, pir=%x, awake=%x\n",
pc->pc_cpuid, pc->pc_pir, pc->pc_awake);
smp_cpus++;
} else
CPU_SET(pc->pc_cpuid, &stopped_cpus);
}
ap_awake = 1;
/* Provide our current DEC and TB values for APs */
ap_timebase = mftb() + 10;
__asm __volatile("msync; isync");
/* Let APs continue */
atomic_store_rel_int(&ap_letgo, 1);
#ifdef __powerpc64__
/* Writing to the time base register is hypervisor-privileged */
if (mfmsr() & PSL_HV)
mttb(ap_timebase);
#else
mttb(ap_timebase);
#endif
while (ap_awake < smp_cpus)
;
if (smp_cpus != cpus || cpus != mp_ncpus) {
printf("SMP: %d CPUs found; %d CPUs usable; %d CPUs woken\n",
mp_ncpus, cpus, smp_cpus);
}
/* Let the APs get into the scheduler */
DELAY(10000);
smp_active = 1;
smp_started = 1;
}
SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, cpu_mp_unleash, NULL);
int
powerpc_ipi_handler(void *arg)
{
u_int cpuid;
uint32_t ipimask;
int msg;
CTR2(KTR_SMP, "%s: MSR 0x%08x", __func__, mfmsr());
ipimask = atomic_readandclear_32(&(pcpup->pc_ipimask));
if (ipimask == 0)
return (FILTER_STRAY);
while ((msg = ffs(ipimask) - 1) != -1) {
ipimask &= ~(1u << msg);
ipi_msg_cnt[msg]++;
switch (msg) {
case IPI_AST:
CTR1(KTR_SMP, "%s: IPI_AST", __func__);
break;
case IPI_PREEMPT:
CTR1(KTR_SMP, "%s: IPI_PREEMPT", __func__);
sched_preempt(curthread);
break;
case IPI_RENDEZVOUS:
CTR1(KTR_SMP, "%s: IPI_RENDEZVOUS", __func__);
smp_rendezvous_action();
break;
case IPI_STOP:
/*
* IPI_STOP_HARD is mapped to IPI_STOP so it is not
* necessary to add such case in the switch.
*/
CTR1(KTR_SMP, "%s: IPI_STOP or IPI_STOP_HARD (stop)",
__func__);
cpuid = PCPU_GET(cpuid);
savectx(&stoppcbs[cpuid]);
savectx(PCPU_GET(curpcb));
CPU_SET_ATOMIC(cpuid, &stopped_cpus);
while (!CPU_ISSET(cpuid, &started_cpus))
cpu_spinwait();
CPU_CLR_ATOMIC(cpuid, &stopped_cpus);
CPU_CLR_ATOMIC(cpuid, &started_cpus);
CTR1(KTR_SMP, "%s: IPI_STOP (restart)", __func__);
break;
case IPI_HARDCLOCK:
CTR1(KTR_SMP, "%s: IPI_HARDCLOCK", __func__);
hardclockintr();
break;
}
}
return (FILTER_HANDLED);
}
static void
ipi_send(struct pcpu *pc, int ipi)
{
CTR4(KTR_SMP, "%s: pc=%p, targetcpu=%d, IPI=%d", __func__,
pc, pc->pc_cpuid, ipi);
atomic_set_32(&pc->pc_ipimask, (1 << ipi));
PIC_IPI(root_pic, pc->pc_cpuid);
CTR1(KTR_SMP, "%s: sent", __func__);
}
/* Send an IPI to a set of cpus. */
void
ipi_selected(cpuset_t cpus, int ipi)
{
struct pcpu *pc;
STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
if (CPU_ISSET(pc->pc_cpuid, &cpus))
ipi_send(pc, ipi);
}
}
/* Send an IPI to a specific CPU. */
void
ipi_cpu(int cpu, u_int ipi)
{
ipi_send(cpuid_to_pcpu[cpu], ipi);
}
/* Send an IPI to all CPUs EXCEPT myself. */
void
ipi_all_but_self(int ipi)
{
struct pcpu *pc;
STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
if (pc != pcpup)
ipi_send(pc, ipi);
}
}