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Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/smp.h> | |
1da177e4 LT |
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 <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> | |
1da44037 | 39 | #include <asm/iseries/hv_call.h> |
1da177e4 | 40 | #include <asm/time.h> |
1da177e4 LT |
41 | #include <asm/machdep.h> |
42 | #include <asm/cputable.h> | |
43 | #include <asm/system.h> | |
44 | ||
1224f373 SR |
45 | #include "smp.h" |
46 | ||
1da177e4 LT |
47 | static unsigned long iSeries_smp_message[NR_CPUS]; |
48 | ||
1224f373 | 49 | void iSeries_smp_message_recv(void) |
1da177e4 LT |
50 | { |
51 | int cpu = smp_processor_id(); | |
52 | int msg; | |
53 | ||
b6b86818 | 54 | if (num_online_cpus() < 2) |
1da177e4 LT |
55 | return; |
56 | ||
b6b86818 SR |
57 | for (msg = 0; msg < 4; msg++) |
58 | if (test_and_clear_bit(msg, &iSeries_smp_message[cpu])) | |
1224f373 | 59 | smp_message_recv(msg); |
1da177e4 LT |
60 | } |
61 | ||
62 | static inline void smp_iSeries_do_message(int cpu, int msg) | |
63 | { | |
64 | set_bit(msg, &iSeries_smp_message[cpu]); | |
65 | HvCall_sendIPI(&(paca[cpu])); | |
66 | } | |
67 | ||
68 | static void smp_iSeries_message_pass(int target, int msg) | |
69 | { | |
70 | int i; | |
71 | ||
72 | if (target < NR_CPUS) | |
73 | smp_iSeries_do_message(target, msg); | |
74 | else { | |
75 | for_each_online_cpu(i) { | |
b6b86818 SR |
76 | if ((target == MSG_ALL_BUT_SELF) && |
77 | (i == smp_processor_id())) | |
1da177e4 LT |
78 | continue; |
79 | smp_iSeries_do_message(i, msg); | |
80 | } | |
81 | } | |
82 | } | |
83 | ||
1da177e4 LT |
84 | static int smp_iSeries_probe(void) |
85 | { | |
11573131 | 86 | return cpumask_weight(cpu_possible_mask); |
1da177e4 LT |
87 | } |
88 | ||
89 | static void smp_iSeries_kick_cpu(int nr) | |
90 | { | |
b6b86818 | 91 | BUG_ON((nr < 0) || (nr >= NR_CPUS)); |
1da177e4 LT |
92 | |
93 | /* Verify that our partition has a processor nr */ | |
3356bb9f | 94 | if (lppaca[nr].dyn_proc_status >= 2) |
1da177e4 LT |
95 | return; |
96 | ||
97 | /* The processor is currently spinning, waiting | |
98 | * for the cpu_start field to become non-zero | |
99 | * After we set cpu_start, the processor will | |
100 | * continue on to secondary_start in iSeries_head.S | |
101 | */ | |
102 | paca[nr].cpu_start = 1; | |
103 | } | |
104 | ||
105 | static void __devinit smp_iSeries_setup_cpu(int nr) | |
106 | { | |
107 | } | |
108 | ||
109 | static struct smp_ops_t iSeries_smp_ops = { | |
110 | .message_pass = smp_iSeries_message_pass, | |
111 | .probe = smp_iSeries_probe, | |
112 | .kick_cpu = smp_iSeries_kick_cpu, | |
113 | .setup_cpu = smp_iSeries_setup_cpu, | |
114 | }; | |
115 | ||
116 | /* This is called very early. */ | |
117 | void __init smp_init_iSeries(void) | |
118 | { | |
119 | smp_ops = &iSeries_smp_ops; | |
1da177e4 | 120 | } |