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5cf998ba8c
Currently, the IPI handling routine riscv_software_interrupt() does not take any argument and also does not perform irq_enter()/irq_exit(). This patch makes IPI handling routine more self-contained by: 1. Passing "pt_regs *" argument 2. Explicitly doing irq_enter()/irq_exit() 3. Explicitly save/restore "pt_regs *" using set_irq_regs() With above changes, IPI handling routine does not depend on caller function to perform irq_enter()/irq_exit() and save/restore of "pt_regs *" hence its more self-contained. This also enables us to call IPI handling routine from IRQCHIP drivers. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com> Acked-by: Palmer Dabbelt <palmerdabbelt@google.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2017 SiFive
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* Copyright (C) 2018 Christoph Hellwig
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*/
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#include <linux/interrupt.h>
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#include <linux/irqchip.h>
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#include <linux/irqdomain.h>
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#include <linux/seq_file.h>
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#include <asm/smp.h>
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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show_ipi_stats(p, prec);
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return 0;
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}
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asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
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{
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struct pt_regs *old_regs;
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switch (regs->cause & ~CAUSE_IRQ_FLAG) {
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case RV_IRQ_TIMER:
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old_regs = set_irq_regs(regs);
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irq_enter();
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riscv_timer_interrupt();
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irq_exit();
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set_irq_regs(old_regs);
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break;
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#ifdef CONFIG_SMP
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case RV_IRQ_SOFT:
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/*
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* We only use software interrupts to pass IPIs, so if a non-SMP
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* system gets one, then we don't know what to do.
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*/
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handle_IPI(regs);
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break;
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#endif
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case RV_IRQ_EXT:
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old_regs = set_irq_regs(regs);
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irq_enter();
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handle_arch_irq(regs);
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irq_exit();
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set_irq_regs(old_regs);
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break;
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default:
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pr_alert("unexpected interrupt cause 0x%lx", regs->cause);
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BUG();
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}
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}
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void __init init_IRQ(void)
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{
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irqchip_init();
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}
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