/*
* SMP support for iSeries machines.
*
* Dave Engebretsen, Peter Bergner, and
* Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
*
* Plus various changes from other IBM teams...
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#undef DEBUG
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/cache.h>
#include <linux/err.h>
#include <linux/sysdev.h>
#include <linux/cpu.h>
#include <asm/ptrace.h>
#include <asm/atomic.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/paca.h>
#include <asm/iSeries/HvCall.h>
#include <asm/time.h>
#include <asm/ppcdebug.h>
#include <asm/machdep.h>
#include <asm/cputable.h>
#include <asm/system.h>
static unsigned long iSeries_smp_message[NR_CPUS];
void iSeries_smp_message_recv( struct pt_regs * regs )
{
int cpu = smp_processor_id();
int msg;
if ( num_online_cpus() < 2 )
return;
for ( msg = 0; msg < 4; ++msg )
if ( test_and_clear_bit( msg, &iSeries_smp_message[cpu] ) )
smp_message_recv( msg, regs );
}
static inline void smp_iSeries_do_message(int cpu, int msg)
{
set_bit(msg, &iSeries_smp_message[cpu]);
HvCall_sendIPI(&(paca[cpu]));
}
static void smp_iSeries_message_pass(int target, int msg)
{
int i;
if (target < NR_CPUS)
smp_iSeries_do_message(target, msg);
else {
for_each_online_cpu(i) {
if (target == MSG_ALL_BUT_SELF
&& i == smp_processor_id())
continue;
smp_iSeries_do_message(i, msg);
}
}
}
static int smp_iSeries_numProcs(void)
{
unsigned np, i;
np = 0;
for (i=0; i < NR_CPUS; ++i) {
if (paca[i].lppaca.dyn_proc_status < 2) {
cpu_set(i, cpu_possible_map);
cpu_set(i, cpu_present_map);
cpu_set(i, cpu_sibling_map[i]);
++np;
}
}
return np;
}
static int smp_iSeries_probe(void)
{
unsigned i;
unsigned np = 0;
for (i=0; i < NR_CPUS; ++i) {
if (paca[i].lppaca.dyn_proc_status < 2) {
/*paca[i].active = 1;*/
++np;
}
}
return np;
}
static void smp_iSeries_kick_cpu(int nr)
{
BUG_ON(nr < 0 || nr >= NR_CPUS);
/* Verify that our partition has a processor nr */
if (paca[nr].lppaca.dyn_proc_status >= 2)
return;
/* The processor is currently spinning, waiting
* for the cpu_start field to become non-zero
* After we set cpu_start, the processor will
* continue on to secondary_start in iSeries_head.S
*/
paca[nr].cpu_start = 1;
}
static void __devinit smp_iSeries_setup_cpu(int nr)
{
}
static struct smp_ops_t iSeries_smp_ops = {
.message_pass = smp_iSeries_message_pass,
.probe = smp_iSeries_probe,
.kick_cpu = smp_iSeries_kick_cpu,
.setup_cpu = smp_iSeries_setup_cpu,
};
/* This is called very early. */
void __init smp_init_iSeries(void)
{
smp_ops = &iSeries_smp_ops;
systemcfg->processorCount = smp_iSeries_numProcs();
}
