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(fmt...) udbg_printf(fmt) 31#else 32#define DBG(fmt...) do{if(0)printk(fmt);}while(0) 33#endif 34 35static irqreturn_t ipi_function_handler(int irq, void *msg) 36{ 37 smp_message_recv((int)(long)msg); 38 return IRQ_HANDLED; 39} 40 41/** 42 * virqs - a per cpu array of virqs for ipi use 43 */ 44 45#define MSG_COUNT 4 46static DEFINE_PER_CPU(unsigned int, virqs[MSG_COUNT]); 47 48static const char *names[MSG_COUNT] = { 49 "ipi call", 50 "ipi reschedule", 51 "ipi migrate", 52 "ipi debug brk" 53}; 54 55static 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 65 virq = per_cpu(virqs, target)[msg]; 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 73static 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 89static int ps3_smp_probe(void) 90{ 91 return 2; 92} 93 94static void __init ps3_smp_setup_cpu(int cpu) 95{ 96 int result; 97 unsigned int *virqs = per_cpu(virqs, cpu); 98 int i; 99 100 DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu); 101 102 /* 103 * Check assumptions on virqs[] indexing. If this 104 * check fails, then a different mapping of PPC_MSG_ 105 * to index needs to be setup. 106 */ 107 108 BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0); 109 BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1); 110 BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3); 111 112 for (i = 0; i < MSG_COUNT; i++) { 113 result = ps3_event_receive_port_setup(cpu, &virqs[i]); 114 115 if (result) 116 continue; 117 118 DBG("%s:%d: (%d, %d) => virq %u\n", 119 __func__, __LINE__, cpu, i, virqs[i]); 120 121 result = request_irq(virqs[i], ipi_function_handler, 122 IRQF_DISABLED, names[i], (void*)(long)i); 123 124 if (result) 125 virqs[i] = NO_IRQ; 126 } 127 128 ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]); 129 130 DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu); 131} 132 133void ps3_smp_cleanup_cpu(int cpu) 134{ 135 unsigned int *virqs = per_cpu(virqs, cpu); 136 int i; 137 138 DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu); 139 140 for (i = 0; i < MSG_COUNT; i++) { 141 free_irq(virqs[i], (void*)(long)i); 142 ps3_event_receive_port_destroy(virqs[i]); 143 virqs[i] = NO_IRQ; 144 } 145 146 DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu); 147} 148 149static struct smp_ops_t ps3_smp_ops = { 150 .probe = ps3_smp_probe, 151 .message_pass = ps3_smp_message_pass, 152 .kick_cpu = smp_generic_kick_cpu, 153 .setup_cpu = ps3_smp_setup_cpu, 154}; 155 156void smp_init_ps3(void) 157{ 158 DBG(" -> %s\n", __func__); 159 smp_ops = &ps3_smp_ops; 160 DBG(" <- %s\n", __func__); 161} 162