diff options
Diffstat (limited to 'arch/powerpc/platforms/iseries/smp.c')
-rw-r--r-- | arch/powerpc/platforms/iseries/smp.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/iseries/smp.c b/arch/powerpc/platforms/iseries/smp.c new file mode 100644 index 00000000..e3265add --- /dev/null +++ b/arch/powerpc/platforms/iseries/smp.c @@ -0,0 +1,89 @@ +/* + * 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> + +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 = 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; +} |