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 
ps3_smp_message_pass(int cpu,int msg)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 
ps3_smp_probe(void)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, 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 
ps3_smp_cleanup_cpu(int cpu)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 
smp_init_ps3(void)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