8154c5d22d
Currently we have the lppaca structs as a simple array of NR_CPUS entries, taking up space in the data section of the kernel image. In future we would like to allocate them dynamically, so this abstracts out the accesses to the array, making it easier to change how we locate the lppaca for a given cpu in future. Specifically, lppaca[cpu] changes to lppaca_of(cpu). Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/*
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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/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/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/hv_call.h>
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#include <asm/time.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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#include "smp.h"
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static unsigned long iSeries_smp_message[NR_CPUS];
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void iSeries_smp_message_recv(void)
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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);
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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_probe(void)
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{
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return cpumask_weight(cpu_possible_mask);
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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 (lppaca_of(nr).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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}
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