1224f373c9
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/*
|
|
* 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/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/hv_call.h>
|
|
#include <asm/time.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/system.h>
|
|
|
|
#include "smp.h"
|
|
|
|
static unsigned long iSeries_smp_message[NR_CPUS];
|
|
|
|
void iSeries_smp_message_recv(void)
|
|
{
|
|
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);
|
|
}
|
|
|
|
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_probe(void)
|
|
{
|
|
return cpus_weight(cpu_possible_map);
|
|
}
|
|
|
|
static void smp_iSeries_kick_cpu(int nr)
|
|
{
|
|
BUG_ON((nr < 0) || (nr >= NR_CPUS));
|
|
|
|
/* Verify that our partition has a processor nr */
|
|
if (lppaca[nr].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;
|
|
}
|