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 42 static void do_message_pass(int target, 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, target)[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__, target, msg, result); 58 } 59 60 static void ps3_smp_message_pass(int target, int msg) 61 { 62 int cpu; 63 64 if (target < NR_CPUS) 65 do_message_pass(target, msg); 66 else if (target == MSG_ALL_BUT_SELF) { 67 for_each_online_cpu(cpu) 68 if (cpu != smp_processor_id()) 69 do_message_pass(cpu, msg); 70 } else { 71 for_each_online_cpu(cpu) 72 do_message_pass(cpu, msg); 73 } 74 } 75 76 static int ps3_smp_probe(void) 77 { 78 return 2; 79 } 80 81 static void __init ps3_smp_setup_cpu(int cpu) 82 { 83 int result; 84 unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu); 85 int i; 86 87 DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu); 88 89 /* 90 * Check assumptions on ps3_ipi_virqs[] indexing. If this 91 * check fails, then a different mapping of PPC_MSG_ 92 * to index needs to be setup. 93 */ 94 95 BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0); 96 BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1); 97 BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2); 98 BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3); 99 100 for (i = 0; i < MSG_COUNT; i++) { 101 result = ps3_event_receive_port_setup(cpu, &virqs[i]); 102 103 if (result) 104 continue; 105 106 DBG("%s:%d: (%d, %d) => virq %u\n", 107 __func__, __LINE__, cpu, i, virqs[i]); 108 109 result = smp_request_message_ipi(virqs[i], i); 110 111 if (result) 112 virqs[i] = NO_IRQ; 113 } 114 115 ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]); 116 117 DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu); 118 } 119 120 void ps3_smp_cleanup_cpu(int cpu) 121 { 122 unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu); 123 int i; 124 125 DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu); 126 127 for (i = 0; i < MSG_COUNT; i++) { 128 /* Can't call free_irq from interrupt context. */ 129 ps3_event_receive_port_destroy(virqs[i]); 130 virqs[i] = NO_IRQ; 131 } 132 133 DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu); 134 } 135 136 static struct smp_ops_t ps3_smp_ops = { 137 .probe = ps3_smp_probe, 138 .message_pass = ps3_smp_message_pass, 139 .kick_cpu = smp_generic_kick_cpu, 140 .setup_cpu = ps3_smp_setup_cpu, 141 }; 142 143 void smp_init_ps3(void) 144 { 145 DBG(" -> %s\n", __func__); 146 smp_ops = &ps3_smp_ops; 147 DBG(" <- %s\n", __func__); 148 } 149