| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * PS3 SMP routines. |
| * |
| * Copyright (C) 2006 Sony Computer Entertainment Inc. |
| * Copyright 2006 Sony Corp. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/smp.h> |
| |
| #include <asm/machdep.h> |
| #include <asm/udbg.h> |
| |
| #include "platform.h" |
| |
| #if defined(DEBUG) |
| #define DBG udbg_printf |
| #else |
| #define DBG pr_debug |
| #endif |
| |
| /** |
| * ps3_ipi_virqs - a per cpu array of virqs for ipi use |
| */ |
| |
| #define MSG_COUNT 4 |
| static DEFINE_PER_CPU(unsigned int [MSG_COUNT], ps3_ipi_virqs); |
| |
| static void ps3_smp_message_pass(int cpu, int msg) |
| { |
| int result; |
| unsigned int virq; |
| |
| if (msg >= MSG_COUNT) { |
| DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg); |
| return; |
| } |
| |
| virq = per_cpu(ps3_ipi_virqs, cpu)[msg]; |
| result = ps3_send_event_locally(virq); |
| |
| if (result) |
| DBG("%s:%d: ps3_send_event_locally(%d, %d) failed" |
| " (%d)\n", __func__, __LINE__, cpu, msg, result); |
| } |
| |
| static void __init ps3_smp_probe(void) |
| { |
| int cpu; |
| |
| for (cpu = 0; cpu < 2; cpu++) { |
| int result; |
| unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu); |
| int i; |
| |
| DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu); |
| |
| /* |
| * Check assumptions on ps3_ipi_virqs[] indexing. If this |
| * check fails, then a different mapping of PPC_MSG_ |
| * to index needs to be setup. |
| */ |
| |
| BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0); |
| BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1); |
| BUILD_BUG_ON(PPC_MSG_TICK_BROADCAST != 2); |
| BUILD_BUG_ON(PPC_MSG_NMI_IPI != 3); |
| |
| for (i = 0; i < MSG_COUNT; i++) { |
| result = ps3_event_receive_port_setup(cpu, &virqs[i]); |
| |
| if (result) |
| continue; |
| |
| DBG("%s:%d: (%d, %d) => virq %u\n", |
| __func__, __LINE__, cpu, i, virqs[i]); |
| |
| result = smp_request_message_ipi(virqs[i], i); |
| |
| if (result) |
| virqs[i] = 0; |
| else |
| ps3_register_ipi_irq(cpu, virqs[i]); |
| } |
| |
| ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_NMI_IPI]); |
| |
| DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu); |
| } |
| } |
| |
| void ps3_smp_cleanup_cpu(int cpu) |
| { |
| unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu); |
| int i; |
| |
| DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu); |
| |
| for (i = 0; i < MSG_COUNT; i++) { |
| /* Can't call free_irq from interrupt context. */ |
| ps3_event_receive_port_destroy(virqs[i]); |
| virqs[i] = 0; |
| } |
| |
| DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu); |
| } |
| |
| static struct smp_ops_t ps3_smp_ops = { |
| .probe = ps3_smp_probe, |
| .message_pass = ps3_smp_message_pass, |
| .kick_cpu = smp_generic_kick_cpu, |
| }; |
| |
| void __init smp_init_ps3(void) |
| { |
| DBG(" -> %s\n", __func__); |
| smp_ops = &ps3_smp_ops; |
| DBG(" <- %s\n", __func__); |
| } |