/* * 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/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; }