mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 00:24:12 +08:00
a6a058e52a
This patch adds a new line to /proc/interrupts to account for the
doorbell interrupts that each hardware thread has received. The total
interrupt count in /proc/stat will now also include doorbells.
# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
16: 551 1267 281 175 XICS Level IPI
LOC: 2037 1503 1688 1625 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
CNT: 0 0 0 0 Performance monitoring interrupts
MCE: 0 0 0 0 Machine check exceptions
DBL: 42 550 20 91 Doorbell interrupts
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
|
|
* Author: Kumar Gala <galak@kernel.crashing.org>
|
|
*
|
|
* Copyright 2009 Freescale Semiconductor Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/hardirq.h>
|
|
|
|
#include <asm/dbell.h>
|
|
#include <asm/irq_regs.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
void doorbell_setup_this_cpu(void)
|
|
{
|
|
unsigned long tag = mfspr(SPRN_DOORBELL_CPUTAG) & PPC_DBELL_TAG_MASK;
|
|
|
|
smp_muxed_ipi_set_data(smp_processor_id(), tag);
|
|
}
|
|
|
|
void doorbell_cause_ipi(int cpu, unsigned long data)
|
|
{
|
|
/* Order previous accesses vs. msgsnd, which is treated as a store */
|
|
mb();
|
|
ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, data);
|
|
}
|
|
|
|
void doorbell_exception(struct pt_regs *regs)
|
|
{
|
|
struct pt_regs *old_regs = set_irq_regs(regs);
|
|
|
|
irq_enter();
|
|
|
|
may_hard_irq_enable();
|
|
|
|
__get_cpu_var(irq_stat).doorbell_irqs++;
|
|
|
|
smp_ipi_demux();
|
|
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|
|
#else /* CONFIG_SMP */
|
|
void doorbell_exception(struct pt_regs *regs)
|
|
{
|
|
printk(KERN_WARNING "Received doorbell on non-smp system\n");
|
|
}
|
|
#endif /* CONFIG_SMP */
|
|
|