1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * PS3 SMP routines. |
4 | * |
5 | * Copyright (C) 2006 Sony Computer Entertainment Inc. |
6 | * Copyright 2006 Sony Corp. |
7 | */ |
8 | |
9 | #include <linux/kernel.h> |
10 | #include <linux/smp.h> |
11 | |
12 | #include <asm/machdep.h> |
13 | #include <asm/udbg.h> |
14 | |
15 | #include "platform.h" |
16 | |
17 | #if defined(DEBUG) |
18 | #define DBG udbg_printf |
19 | #else |
20 | #define DBG pr_debug |
21 | #endif |
22 | |
23 | /** |
24 | * ps3_ipi_virqs - a per cpu array of virqs for ipi use |
25 | */ |
26 | |
27 | #define MSG_COUNT 4 |
28 | static DEFINE_PER_CPU(unsigned int [MSG_COUNT], ps3_ipi_virqs); |
29 | |
30 | static void ps3_smp_message_pass(int cpu, int msg) |
31 | { |
32 | int result; |
33 | unsigned int virq; |
34 | |
35 | if (msg >= MSG_COUNT) { |
36 | DBG("%s:%d: bad msg: %d\n" , __func__, __LINE__, msg); |
37 | return; |
38 | } |
39 | |
40 | virq = per_cpu(ps3_ipi_virqs, cpu)[msg]; |
41 | result = ps3_send_event_locally(virq); |
42 | |
43 | if (result) |
44 | DBG("%s:%d: ps3_send_event_locally(%d, %d) failed" |
45 | " (%d)\n" , __func__, __LINE__, cpu, msg, result); |
46 | } |
47 | |
48 | static void __init ps3_smp_probe(void) |
49 | { |
50 | int cpu; |
51 | |
52 | for (cpu = 0; cpu < 2; cpu++) { |
53 | int result; |
54 | unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu); |
55 | int i; |
56 | |
57 | DBG(" -> %s:%d: (%d)\n" , __func__, __LINE__, cpu); |
58 | |
59 | /* |
60 | * Check assumptions on ps3_ipi_virqs[] indexing. If this |
61 | * check fails, then a different mapping of PPC_MSG_ |
62 | * to index needs to be setup. |
63 | */ |
64 | |
65 | BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0); |
66 | BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1); |
67 | BUILD_BUG_ON(PPC_MSG_TICK_BROADCAST != 2); |
68 | BUILD_BUG_ON(PPC_MSG_NMI_IPI != 3); |
69 | |
70 | for (i = 0; i < MSG_COUNT; i++) { |
71 | result = ps3_event_receive_port_setup(cpu, &virqs[i]); |
72 | |
73 | if (result) |
74 | continue; |
75 | |
76 | DBG("%s:%d: (%d, %d) => virq %u\n" , |
77 | __func__, __LINE__, cpu, i, virqs[i]); |
78 | |
79 | result = smp_request_message_ipi(virqs[i], i); |
80 | |
81 | if (result) |
82 | virqs[i] = 0; |
83 | else |
84 | ps3_register_ipi_irq(cpu, virq: virqs[i]); |
85 | } |
86 | |
87 | ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_NMI_IPI]); |
88 | |
89 | DBG(" <- %s:%d: (%d)\n" , __func__, __LINE__, cpu); |
90 | } |
91 | } |
92 | |
93 | void ps3_smp_cleanup_cpu(int cpu) |
94 | { |
95 | unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu); |
96 | int i; |
97 | |
98 | DBG(" -> %s:%d: (%d)\n" , __func__, __LINE__, cpu); |
99 | |
100 | for (i = 0; i < MSG_COUNT; i++) { |
101 | /* Can't call free_irq from interrupt context. */ |
102 | ps3_event_receive_port_destroy(virqs[i]); |
103 | virqs[i] = 0; |
104 | } |
105 | |
106 | DBG(" <- %s:%d: (%d)\n" , __func__, __LINE__, cpu); |
107 | } |
108 | |
109 | static struct smp_ops_t ps3_smp_ops = { |
110 | .probe = ps3_smp_probe, |
111 | .message_pass = ps3_smp_message_pass, |
112 | .kick_cpu = smp_generic_kick_cpu, |
113 | }; |
114 | |
115 | void __init smp_init_ps3(void) |
116 | { |
117 | DBG(" -> %s\n" , __func__); |
118 | smp_ops = &ps3_smp_ops; |
119 | DBG(" <- %s\n" , __func__); |
120 | } |
121 | |