fb94fc2b89
ps3 has 4 ipis per cpu and can use the new smp_request_message_ipi to reduce path length when receiving an ipi. This has the side effect of setting IRQF_PERCPU. Signed-off-by: Milton Miller <miltonm@bga.com> Acked-by: Geoff Levand <geoffrey.levand@am.sony.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/*
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* PS3 SMP routines.
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*
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* Copyright (C) 2006 Sony Computer Entertainment Inc.
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* Copyright 2006 Sony Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <asm/machdep.h>
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#include <asm/udbg.h>
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#include "platform.h"
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#if defined(DEBUG)
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#define DBG udbg_printf
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#else
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#define DBG pr_debug
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#endif
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/**
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* ps3_ipi_virqs - a per cpu array of virqs for ipi use
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*/
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#define MSG_COUNT 4
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static DEFINE_PER_CPU(unsigned int, ps3_ipi_virqs[MSG_COUNT]);
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static void do_message_pass(int target, int msg)
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{
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int result;
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unsigned int virq;
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if (msg >= MSG_COUNT) {
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DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
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return;
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}
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virq = per_cpu(ps3_ipi_virqs, target)[msg];
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result = ps3_send_event_locally(virq);
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if (result)
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DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
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" (%d)\n", __func__, __LINE__, target, msg, result);
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}
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static void ps3_smp_message_pass(int target, int msg)
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{
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int cpu;
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if (target < NR_CPUS)
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do_message_pass(target, msg);
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else if (target == MSG_ALL_BUT_SELF) {
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for_each_online_cpu(cpu)
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if (cpu != smp_processor_id())
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do_message_pass(cpu, msg);
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} else {
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for_each_online_cpu(cpu)
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do_message_pass(cpu, msg);
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}
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}
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static int ps3_smp_probe(void)
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{
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return 2;
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}
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static void __init ps3_smp_setup_cpu(int cpu)
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{
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int result;
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unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
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int i;
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DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
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/*
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* Check assumptions on ps3_ipi_virqs[] indexing. If this
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* check fails, then a different mapping of PPC_MSG_
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* to index needs to be setup.
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*/
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BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0);
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BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1);
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BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2);
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BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);
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for (i = 0; i < MSG_COUNT; i++) {
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result = ps3_event_receive_port_setup(cpu, &virqs[i]);
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if (result)
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continue;
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DBG("%s:%d: (%d, %d) => virq %u\n",
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__func__, __LINE__, cpu, i, virqs[i]);
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result = smp_request_message_ipi(virqs[i], i);
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if (result)
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virqs[i] = NO_IRQ;
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}
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ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
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DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
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}
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void ps3_smp_cleanup_cpu(int cpu)
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{
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unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
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int i;
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DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
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for (i = 0; i < MSG_COUNT; i++) {
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/* Can't call free_irq from interrupt context. */
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ps3_event_receive_port_destroy(virqs[i]);
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virqs[i] = NO_IRQ;
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}
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DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
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}
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static struct smp_ops_t ps3_smp_ops = {
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.probe = ps3_smp_probe,
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.message_pass = ps3_smp_message_pass,
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.kick_cpu = smp_generic_kick_cpu,
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.setup_cpu = ps3_smp_setup_cpu,
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};
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void smp_init_ps3(void)
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{
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DBG(" -> %s\n", __func__);
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smp_ops = &ps3_smp_ops;
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DBG(" <- %s\n", __func__);
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}
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