/* * 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/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/device.h> #include <linux/cpu.h> #include <asm/ptrace.h> #include <linux/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> static void smp_iSeries_cause_ipi(int cpu, unsigned long data) { HvCall_sendIPI(&(paca[cpu])); } static int smp_iSeries_probe(void) { return cpumask_weight(cpu_possible_mask); } static int smp_iSeries_kick_cpu(int nr) { BUG_ON((nr < 0) || (nr >= NR_CPUS)); /* Verify that our partition has a processor nr */ if (lppaca_of(nr).dyn_proc_status >= 2) return -ENOENT; /* 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; return 0; } static void __devinit smp_iSeries_setup_cpu(int nr) { } static struct smp_ops_t iSeries_smp_ops = { .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */ .cause_ipi = smp_iSeries_cause_ipi, .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; }