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8b20d2db0a
This patch provides arch_show_interrupts() implementation to
show IPI stats via /proc/interrupts.
Now the contents of /proc/interrupts" will look like below:
CPU0 CPU1 CPU2 CPU3
8: 17 7 6 14 SiFive PLIC 8 virtio0
10: 10 10 9 11 SiFive PLIC 10 ttyS0
IPI0: 170 673 251 79 Rescheduling interrupts
IPI1: 1 12 27 1 Function call interrupts
Signed-off-by: Anup Patel <anup@brainfault.org>
[Atish - Fixed checkpatch errors]
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Changes since v2:
- Remove use of IPI_CALL_WAKEUP because it's being removed
Changes since v1:
- Add stub inline show_ipi_stats() function for !CONFIG_SMP
- Make ipi_names[] dynamically sized at compile time
- Minor beautification of ipi_names[] using tabs
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
68 lines
1.5 KiB
C
68 lines
1.5 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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/*
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* Possible interrupt causes:
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*/
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#define INTERRUPT_CAUSE_SOFTWARE 1
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#define INTERRUPT_CAUSE_TIMER 5
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#define INTERRUPT_CAUSE_EXTERNAL 9
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/*
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* The high order bit of the trap cause register is always set for
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* interrupts, which allows us to differentiate them from exceptions
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* quickly. The INTERRUPT_CAUSE_* macros don't contain that bit, so we
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* need to mask it off.
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*/
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#define INTERRUPT_CAUSE_FLAG (1UL << (__riscv_xlen - 1))
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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 void __irq_entry do_IRQ(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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switch (regs->scause & ~INTERRUPT_CAUSE_FLAG) {
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case INTERRUPT_CAUSE_TIMER:
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riscv_timer_interrupt();
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break;
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#ifdef CONFIG_SMP
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case INTERRUPT_CAUSE_SOFTWARE:
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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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riscv_software_interrupt();
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break;
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#endif
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case INTERRUPT_CAUSE_EXTERNAL:
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handle_arch_irq(regs);
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break;
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default:
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panic("unexpected interrupt cause");
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}
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irq_exit();
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set_irq_regs(old_regs);
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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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