b866cc2199
Change the doorbell callers to know about their msgsnd addressing, rather than have them set a per-cpu target data tag at boot that gets sent to the cause_ipi functions. The data is only used for doorbell IPI functions, no other IPI types, so it makes sense to keep that detail local to doorbell. Have the platform code understand doorbell IPIs, rather than the interrupt controller code understand them. Platform code can look at capabilities it has available and decide which to use. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
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* Author: Kumar Gala <galak@kernel.crashing.org>
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*
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* Copyright 2009 Freescale Semiconductor Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <linux/hardirq.h>
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#include <asm/dbell.h>
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#include <asm/irq_regs.h>
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#include <asm/kvm_ppc.h>
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#ifdef CONFIG_SMP
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/*
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* Doorbells must only be used if CPU_FTR_DBELL is available.
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* msgsnd is used in HV, and msgsndp is used in !HV.
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*
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* These should be used by platform code that is aware of restrictions.
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* Other arch code should use ->cause_ipi.
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*
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* doorbell_global_ipi() sends a dbell to any target CPU.
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* Must be used only by architectures that address msgsnd target
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* by PIR/get_hard_smp_processor_id.
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*/
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void doorbell_global_ipi(int cpu)
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{
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u32 tag = get_hard_smp_processor_id(cpu);
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kvmppc_set_host_ipi(cpu, 1);
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/* Order previous accesses vs. msgsnd, which is treated as a store */
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mb();
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ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
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}
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/*
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* doorbell_core_ipi() sends a dbell to a target CPU in the same core.
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* Must be used only by architectures that address msgsnd target
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* by TIR/cpu_thread_in_core.
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*/
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void doorbell_core_ipi(int cpu)
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{
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u32 tag = cpu_thread_in_core(cpu);
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kvmppc_set_host_ipi(cpu, 1);
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/* Order previous accesses vs. msgsnd, which is treated as a store */
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mb();
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ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
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}
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/*
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* Attempt to cause a core doorbell if destination is on the same core.
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* Returns 1 on success, 0 on failure.
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*/
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int doorbell_try_core_ipi(int cpu)
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{
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int this_cpu = get_cpu();
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int ret = 0;
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if (cpumask_test_cpu(cpu, cpu_sibling_mask(this_cpu))) {
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doorbell_core_ipi(cpu);
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ret = 1;
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}
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put_cpu();
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return ret;
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}
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void doorbell_exception(struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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irq_enter();
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may_hard_irq_enable();
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kvmppc_set_host_ipi(smp_processor_id(), 0);
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__this_cpu_inc(irq_stat.doorbell_irqs);
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smp_ipi_demux();
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irq_exit();
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set_irq_regs(old_regs);
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}
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#else /* CONFIG_SMP */
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void doorbell_exception(struct pt_regs *regs)
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{
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printk(KERN_WARNING "Received doorbell on non-smp system\n");
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}
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#endif /* CONFIG_SMP */
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