| | 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, 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 | } |
projects / linux-2.6-block.git / blame_incremental