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