blob: 2df48c2287bdcfaad589e3ba44c19bce98ba9f73 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/sched.h>
20#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#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 <asm/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>
Kelly Daly1da44032005-11-01 16:59:20 +110039#include <asm/iseries/hv_call.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <asm/time.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/machdep.h>
42#include <asm/cputable.h>
43#include <asm/system.h>
44
Milton Miller23d72bf2011-05-10 19:29:39 +000045static void smp_iSeries_cause_ipi(int cpu, unsigned long data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 HvCall_sendIPI(&(paca[cpu]));
48}
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static int smp_iSeries_probe(void)
51{
Anton Blanchard11573132010-04-26 15:32:36 +000052 return cpumask_weight(cpu_possible_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053}
54
Michael Ellermande300972011-04-11 21:46:19 +000055static int smp_iSeries_kick_cpu(int nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Stephen Rothwellb6b86812005-09-28 03:07:14 +100057 BUG_ON((nr < 0) || (nr >= NR_CPUS));
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 /* Verify that our partition has a processor nr */
Paul Mackerras8154c5d2010-08-12 20:18:15 +000060 if (lppaca_of(nr).dyn_proc_status >= 2)
Michael Ellermande300972011-04-11 21:46:19 +000061 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
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;
Michael Ellermande300972011-04-11 21:46:19 +000069
70 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071}
72
73static void __devinit smp_iSeries_setup_cpu(int nr)
74{
75}
76
77static struct smp_ops_t iSeries_smp_ops = {
Paul Mackerras9ca980d2011-05-25 23:34:12 +000078 .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */
Milton Miller23d72bf2011-05-10 19:29:39 +000079 .cause_ipi = smp_iSeries_cause_ipi,
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 .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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089}