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/*
* PS3 SMP routines.
*
* Copyright (C) 2006 Sony Computer Entertainment Inc.
* Copyright 2006 Sony Corp.
*
* 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/smp.h>
#include <asm/machdep.h>
#include <asm/udbg.h>
#include "platform.h"
#if defined(DEBUG)
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...) do{if(0)printk(fmt);}while(0)
#endif
static irqreturn_t ipi_function_handler(int irq, void *msg)
{
smp_message_recv((int)(long)msg);
return IRQ_HANDLED;
}
/**
* virqs - a per cpu array of virqs for ipi use
*/
#define MSG_COUNT 4
static DEFINE_PER_CPU(unsigned int, virqs[MSG_COUNT]);
static const char *names[MSG_COUNT] = {
"ipi call",
"ipi reschedule",
"ipi migrate",
"ipi debug brk"
};
static void do_message_pass(int target, int msg)
{
int result;
unsigned int virq;
if (msg >= MSG_COUNT) {
DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
return;
}
virq = per_cpu(virqs, target)[msg];
result = ps3_send_event_locally(virq);
if (result)
DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
" (%d)\n", __func__, __LINE__, target, msg, result);
}
static void ps3_smp_message_pass(int target, int msg)
{
int cpu;
if (target < NR_CPUS)
do_message_pass(target, msg);
else if (target == MSG_ALL_BUT_SELF) {
for_each_online_cpu(cpu)
if (cpu != smp_processor_id())
do_message_pass(cpu, msg);
} else {
for_each_online_cpu(cpu)
do_message_pass(cpu, msg);
}
}
static int ps3_smp_probe(void)
{
return 2;
}
static void __init ps3_smp_setup_cpu(int cpu)
{
int result;
unsigned int *virqs = per_cpu(virqs, cpu);
int i;
DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
/*
* Check assumptions on virqs[] indexing. If this
* check fails, then a different mapping of PPC_MSG_
* to index needs to be setup.
*/
BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0);
BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1);
BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);
for (i = 0; i < MSG_COUNT; i++) {
result = ps3_alloc_event_irq(cpu, &virqs[i]);
if (result)
continue;
DBG("%s:%d: (%d, %d) => virq %u\n",
__func__, __LINE__, cpu, i, virqs[i]);
request_irq(virqs[i], ipi_function_handler, IRQF_DISABLED,
names[i], (void*)(long)i);
}
ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
}
void ps3_smp_cleanup_cpu(int cpu)
{
unsigned int *virqs = per_cpu(virqs, cpu);
int i;
DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
for (i = 0; i < MSG_COUNT; i++) {
ps3_free_event_irq(virqs[i]);
free_irq(virqs[i], (void*)(long)i);
virqs[i] = NO_IRQ;
}
DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
}
static struct smp_ops_t ps3_smp_ops = {
.probe = ps3_smp_probe,
.message_pass = ps3_smp_message_pass,
.kick_cpu = smp_generic_kick_cpu,
.setup_cpu = ps3_smp_setup_cpu,
};
void smp_init_ps3(void)
{
DBG(" -> %s\n", __func__);
smp_ops = &ps3_smp_ops;
DBG(" <- %s\n", __func__);
}
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