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c28548012e
Interrupt entry sets the soft mask to IRQS_ALL_DISABLED to match the hard irq disabled state. So when should_hard_irq_enable() returns true because we want PMI interrupts in irq handlers, MSR[EE] is enabled but PMIs just get soft-masked. Fix this by clearing IRQS_PMI_DISABLED before enabling MSR[EE]. This also tidies some of the warnings, no need to duplicate them in both should_hard_irq_enable() and do_hard_irq_enable(). Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20230121100156.2824054-1-npiggin@gmail.com
47 lines
1,006 B
C
47 lines
1,006 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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/interrupt.h>
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#include <asm/irq_regs.h>
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#include <asm/kvm_ppc.h>
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#include <asm/trace.h>
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#ifdef CONFIG_SMP
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DEFINE_INTERRUPT_HANDLER_ASYNC(doorbell_exception)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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trace_doorbell_entry(regs);
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ppc_msgsync();
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if (should_hard_irq_enable(regs))
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do_hard_irq_enable();
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kvmppc_clear_host_ipi(smp_processor_id());
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__this_cpu_inc(irq_stat.doorbell_irqs);
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smp_ipi_demux_relaxed(); /* already performed the barrier */
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trace_doorbell_exit(regs);
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set_irq_regs(old_regs);
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}
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#else /* CONFIG_SMP */
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DEFINE_INTERRUPT_HANDLER_ASYNC(doorbell_exception)
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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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