| /* |
| * 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; |
| } |
