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Commit | Line | Data |
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f58a9d17 GL |
1 | /* |
2 | * PS3 SMP routines. | |
3 | * | |
4 | * Copyright (C) 2006 Sony Computer Entertainment Inc. | |
5 | * Copyright 2006 Sony Corp. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/smp.h> | |
23 | ||
24 | #include <asm/machdep.h> | |
25 | #include <asm/udbg.h> | |
f58a9d17 GL |
26 | |
27 | #include "platform.h" | |
28 | ||
29 | #if defined(DEBUG) | |
83bb643d | 30 | #define DBG udbg_printf |
f58a9d17 | 31 | #else |
83bb643d | 32 | #define DBG pr_debug |
f58a9d17 GL |
33 | #endif |
34 | ||
35 | static irqreturn_t ipi_function_handler(int irq, void *msg) | |
36 | { | |
37 | smp_message_recv((int)(long)msg); | |
38 | return IRQ_HANDLED; | |
39 | } | |
40 | ||
41 | /** | |
7961f20c | 42 | * ps3_ipi_virqs - a per cpu array of virqs for ipi use |
f58a9d17 GL |
43 | */ |
44 | ||
45 | #define MSG_COUNT 4 | |
7961f20c | 46 | static DEFINE_PER_CPU(unsigned int, ps3_ipi_virqs[MSG_COUNT]); |
f58a9d17 GL |
47 | |
48 | static const char *names[MSG_COUNT] = { | |
49 | "ipi call", | |
50 | "ipi reschedule", | |
51 | "ipi migrate", | |
52 | "ipi debug brk" | |
53 | }; | |
54 | ||
55 | static void do_message_pass(int target, int msg) | |
56 | { | |
57 | int result; | |
58 | unsigned int virq; | |
59 | ||
60 | if (msg >= MSG_COUNT) { | |
61 | DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg); | |
62 | return; | |
63 | } | |
64 | ||
7961f20c | 65 | virq = per_cpu(ps3_ipi_virqs, target)[msg]; |
f58a9d17 GL |
66 | result = ps3_send_event_locally(virq); |
67 | ||
68 | if (result) | |
69 | DBG("%s:%d: ps3_send_event_locally(%d, %d) failed" | |
70 | " (%d)\n", __func__, __LINE__, target, msg, result); | |
71 | } | |
72 | ||
73 | static void ps3_smp_message_pass(int target, int msg) | |
74 | { | |
75 | int cpu; | |
76 | ||
77 | if (target < NR_CPUS) | |
78 | do_message_pass(target, msg); | |
79 | else if (target == MSG_ALL_BUT_SELF) { | |
80 | for_each_online_cpu(cpu) | |
81 | if (cpu != smp_processor_id()) | |
82 | do_message_pass(cpu, msg); | |
83 | } else { | |
84 | for_each_online_cpu(cpu) | |
85 | do_message_pass(cpu, msg); | |
86 | } | |
87 | } | |
88 | ||
89 | static int ps3_smp_probe(void) | |
90 | { | |
91 | return 2; | |
92 | } | |
93 | ||
94 | static void __init ps3_smp_setup_cpu(int cpu) | |
95 | { | |
96 | int result; | |
7961f20c | 97 | unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu); |
f58a9d17 GL |
98 | int i; |
99 | ||
100 | DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu); | |
101 | ||
102 | /* | |
7961f20c | 103 | * Check assumptions on ps3_ipi_virqs[] indexing. If this |
f58a9d17 GL |
104 | * check fails, then a different mapping of PPC_MSG_ |
105 | * to index needs to be setup. | |
106 | */ | |
107 | ||
b7d7a240 JA |
108 | BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0); |
109 | BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1); | |
110 | BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2); | |
111 | BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3); | |
f58a9d17 GL |
112 | |
113 | for (i = 0; i < MSG_COUNT; i++) { | |
dc4f60c2 | 114 | result = ps3_event_receive_port_setup(cpu, &virqs[i]); |
f58a9d17 GL |
115 | |
116 | if (result) | |
117 | continue; | |
118 | ||
119 | DBG("%s:%d: (%d, %d) => virq %u\n", | |
120 | __func__, __LINE__, cpu, i, virqs[i]); | |
121 | ||
28820d9f GL |
122 | result = request_irq(virqs[i], ipi_function_handler, |
123 | IRQF_DISABLED, names[i], (void*)(long)i); | |
f58a9d17 | 124 | |
28820d9f GL |
125 | if (result) |
126 | virqs[i] = NO_IRQ; | |
f58a9d17 GL |
127 | } |
128 | ||
129 | ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]); | |
130 | ||
131 | DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu); | |
132 | } | |
133 | ||
134 | void ps3_smp_cleanup_cpu(int cpu) | |
135 | { | |
7961f20c | 136 | unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu); |
f58a9d17 GL |
137 | int i; |
138 | ||
139 | DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu); | |
dc4f60c2 | 140 | |
f58a9d17 | 141 | for (i = 0; i < MSG_COUNT; i++) { |
9263e85a | 142 | /* Can't call free_irq from interrupt context. */ |
dc4f60c2 | 143 | ps3_event_receive_port_destroy(virqs[i]); |
f58a9d17 GL |
144 | virqs[i] = NO_IRQ; |
145 | } | |
dc4f60c2 | 146 | |
f58a9d17 GL |
147 | DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu); |
148 | } | |
149 | ||
150 | static struct smp_ops_t ps3_smp_ops = { | |
151 | .probe = ps3_smp_probe, | |
152 | .message_pass = ps3_smp_message_pass, | |
153 | .kick_cpu = smp_generic_kick_cpu, | |
154 | .setup_cpu = ps3_smp_setup_cpu, | |
155 | }; | |
156 | ||
157 | void smp_init_ps3(void) | |
158 | { | |
159 | DBG(" -> %s\n", __func__); | |
160 | smp_ops = &ps3_smp_ops; | |
161 | DBG(" <- %s\n", __func__); | |
162 | } |