1/*
 2 * SMP support for iSeries machines.
 3 *
 4 * Dave Engebretsen, Peter Bergner, and
 5 * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
 6 *
 7 * Plus various changes from other IBM teams...
 8 *
 9 *      This program is free software; you can redistribute it and/or
10 *      modify it under the terms of the GNU General Public License
11 *      as published by the Free Software Foundation; either version
12 *      2 of the License, or (at your option) any later version.
13 */
14
15#undef DEBUG
16
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/sched.h>
20#include <linux/smp.h>
21#include <linux/interrupt.h>
22#include <linux/kernel_stat.h>
23#include <linux/delay.h>
24#include <linux/init.h>
25#include <linux/spinlock.h>
26#include <linux/cache.h>
27#include <linux/err.h>
28#include <linux/sysdev.h>
29#include <linux/cpu.h>
30
31#include <asm/ptrace.h>
32#include <linux/atomic.h>
33#include <asm/irq.h>
34#include <asm/page.h>
35#include <asm/pgtable.h>
36#include <asm/io.h>
37#include <asm/smp.h>
38#include <asm/paca.h>
39#include <asm/iseries/hv_call.h>
40#include <asm/time.h>
41#include <asm/machdep.h>
42#include <asm/cputable.h>
43#include <asm/system.h>
44
45static void smp_iSeries_cause_ipi(int cpu, unsigned long data)
46{
47	HvCall_sendIPI(&(paca[cpu]));
48}
49
50static int smp_iSeries_probe(void)
51{
52	return cpumask_weight(cpu_possible_mask);
53}
54
55static int smp_iSeries_kick_cpu(int nr)
56{
57	BUG_ON((nr < 0) || (nr >= NR_CPUS));
58
59	/* Verify that our partition has a processor nr */
60	if (lppaca_of(nr).dyn_proc_status >= 2)
61		return -ENOENT;
62
63	/* The processor is currently spinning, waiting
64	 * for the cpu_start field to become non-zero
65	 * After we set cpu_start, the processor will
66	 * continue on to secondary_start in iSeries_head.S
67	 */
68	paca[nr].cpu_start = 1;
69
70	return 0;
71}
72
73static void __devinit smp_iSeries_setup_cpu(int nr)
74{
75}
76
77static struct smp_ops_t iSeries_smp_ops = {
78	.message_pass = NULL,	/* Use smp_muxed_ipi_message_pass */
79	.cause_ipi    = smp_iSeries_cause_ipi,
80	.probe        = smp_iSeries_probe,
81	.kick_cpu     = smp_iSeries_kick_cpu,
82	.setup_cpu    = smp_iSeries_setup_cpu,
83};
84
85/* This is called very early. */
86void __init smp_init_iSeries(void)
87{
88	smp_ops = &iSeries_smp_ops;
89}