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>
26
27 #include "platform.h"
28
29 #if defined(DEBUG)
30 #define DBG udbg_printf
31 #else
32 #define DBG pr_debug
33 #endif
34
35 /**
36 * ps3_ipi_virqs - a per cpu array of virqs for ipi use
37 */
38
39 #define MSG_COUNT 4
40 static DEFINE_PER_CPU(unsigned int [MSG_COUNT], ps3_ipi_virqs);
41
ps3_smp_message_pass(int cpu,int msg)42 static void ps3_smp_message_pass(int cpu, int msg)
43 {
44 int result;
45 unsigned int virq;
46
47 if (msg >= MSG_COUNT) {
48 DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
49 return;
50 }
51
52 virq = per_cpu(ps3_ipi_virqs, cpu)[msg];
53 result = ps3_send_event_locally(virq);
54
55 if (result)
56 DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
57 " (%d)\n", __func__, __LINE__, cpu, msg, result);
58 }
59
ps3_smp_probe(void)60 static int __init ps3_smp_probe(void)
61 {
62 int cpu;
63
64 for (cpu = 0; cpu < 2; cpu++) {
65 int result;
66 unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
67 int i;
68
69 DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
70
71 /*
72 * Check assumptions on ps3_ipi_virqs[] indexing. If this
73 * check fails, then a different mapping of PPC_MSG_
74 * to index needs to be setup.
75 */
76
77 BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0);
78 BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1);
79 BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2);
80 BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);
81
82 for (i = 0; i < MSG_COUNT; i++) {
83 result = ps3_event_receive_port_setup(cpu, &virqs[i]);
84
85 if (result)
86 continue;
87
88 DBG("%s:%d: (%d, %d) => virq %u\n",
89 __func__, __LINE__, cpu, i, virqs[i]);
90
91 result = smp_request_message_ipi(virqs[i], i);
92
93 if (result)
94 virqs[i] = NO_IRQ;
95 else
96 ps3_register_ipi_irq(cpu, virqs[i]);
97 }
98
99 ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
100
101 DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
102 }
103
104 return 2;
105 }
106
ps3_smp_cleanup_cpu(int cpu)107 void ps3_smp_cleanup_cpu(int cpu)
108 {
109 unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
110 int i;
111
112 DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
113
114 for (i = 0; i < MSG_COUNT; i++) {
115 /* Can't call free_irq from interrupt context. */
116 ps3_event_receive_port_destroy(virqs[i]);
117 virqs[i] = NO_IRQ;
118 }
119
120 DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
121 }
122
123 static struct smp_ops_t ps3_smp_ops = {
124 .probe = ps3_smp_probe,
125 .message_pass = ps3_smp_message_pass,
126 .kick_cpu = smp_generic_kick_cpu,
127 };
128
smp_init_ps3(void)129 void smp_init_ps3(void)
130 {
131 DBG(" -> %s\n", __func__);
132 smp_ops = &ps3_smp_ops;
133 DBG(" <- %s\n", __func__);
134 }
135