2 * SMP support for iSeries machines.
4 * Dave Engebretsen, Peter Bergner, and
5 * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
7 * Plus various changes from other IBM teams...
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.
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/sysdev.h>
28 #include <linux/cpu.h>
30 #include <asm/ptrace.h>
31 #include <linux/atomic.h>
34 #include <asm/pgtable.h>
38 #include <asm/iseries/hv_call.h>
40 #include <asm/machdep.h>
41 #include <asm/cputable.h>
42 #include <asm/system.h>
44 static void smp_iSeries_cause_ipi(int cpu
, unsigned long data
)
46 HvCall_sendIPI(&(paca
[cpu
]));
49 static int smp_iSeries_probe(void)
51 return cpumask_weight(cpu_possible_mask
);
54 static int smp_iSeries_kick_cpu(int nr
)
56 BUG_ON((nr
< 0) || (nr
>= NR_CPUS
));
58 /* Verify that our partition has a processor nr */
59 if (lppaca_of(nr
).dyn_proc_status
>= 2)
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
67 paca
[nr
].cpu_start
= 1;
72 static void __devinit
smp_iSeries_setup_cpu(int nr
)
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
,
84 /* This is called very early. */
85 void __init
smp_init_iSeries(void)
87 smp_ops
= &iSeries_smp_ops
;