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/sched.h>
19 #include <linux/smp.h>
20 #include <linux/interrupt.h>
21 #include <linux/kernel_stat.h>
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/spinlock.h>
25 #include <linux/cache.h>
26 #include <linux/err.h>
27 #include <linux/device.h>
28 #include <linux/cpu.h>
29
30 #include <asm/ptrace.h>
31 #include <linux/atomic.h>
32 #include <asm/irq.h>
33 #include <asm/page.h>
34 #include <asm/pgtable.h>
35 #include <asm/io.h>
36 #include <asm/smp.h>
37 #include <asm/paca.h>
38 #include <asm/iseries/hv_call.h>
39 #include <asm/time.h>
40 #include <asm/machdep.h>
41 #include <asm/cputable.h>
42 #include <asm/system.h>
43
smp_iSeries_cause_ipi(int cpu,unsigned long data)44 static void smp_iSeries_cause_ipi(int cpu, unsigned long data)
45 {
46 HvCall_sendIPI(&(paca[cpu]));
47 }
48
smp_iSeries_probe(void)49 static int smp_iSeries_probe(void)
50 {
51 return cpumask_weight(cpu_possible_mask);
52 }
53
smp_iSeries_kick_cpu(int nr)54 static int smp_iSeries_kick_cpu(int nr)
55 {
56 BUG_ON((nr < 0) || (nr >= NR_CPUS));
57
58 /* Verify that our partition has a processor nr */
59 if (lppaca_of(nr).dyn_proc_status >= 2)
60 return -ENOENT;
61
62 /* The processor is currently spinning, waiting
63 * for the cpu_start field to become non-zero
64 * After we set cpu_start, the processor will
65 * continue on to secondary_start in iSeries_head.S
66 */
67 paca[nr].cpu_start = 1;
68
69 return 0;
70 }
71
smp_iSeries_setup_cpu(int nr)72 static void __devinit smp_iSeries_setup_cpu(int nr)
73 {
74 }
75
76 static struct smp_ops_t iSeries_smp_ops = {
77 .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */
78 .cause_ipi = smp_iSeries_cause_ipi,
79 .probe = smp_iSeries_probe,
80 .kick_cpu = smp_iSeries_kick_cpu,
81 .setup_cpu = smp_iSeries_setup_cpu,
82 };
83
84 /* This is called very early. */
smp_init_iSeries(void)85 void __init smp_init_iSeries(void)
86 {
87 smp_ops = &iSeries_smp_ops;
88 }
89