182 lines
4.3 KiB
C
182 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/ia64/kernel/irq.c
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*
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* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
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*
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* This file contains the code used by various IRQ handling routines:
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* asking for different IRQs should be done through these routines
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* instead of just grabbing them. Thus setups with different IRQ numbers
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* shouldn't result in any weird surprises, and installing new handlers
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* should be easier.
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*
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* Copyright (C) Ashok Raj<ashok.raj@intel.com>, Intel Corporation 2004
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*
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* 4/14/2004: Added code to handle cpu migration and do safe irq
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* migration without losing interrupts for iosapic
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* architecture.
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*/
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#include <asm/delay.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <asm/mca.h>
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#include <asm/xtp.h>
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/*
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* 'what should we do if we get a hw irq event on an illegal vector'.
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* each architecture has to answer this themselves.
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*/
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void ack_bad_irq(unsigned int irq)
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{
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printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id());
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}
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/*
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* Interrupt statistics:
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*/
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atomic_t irq_err_count;
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/*
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* /proc/interrupts printing:
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*/
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
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return 0;
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}
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#ifdef CONFIG_SMP
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static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 };
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void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
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{
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if (irq < NR_IRQS) {
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cpumask_copy(irq_get_affinity_mask(irq),
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cpumask_of(cpu_logical_id(hwid)));
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irq_redir[irq] = (char) (redir & 0xff);
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}
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}
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#endif /* CONFIG_SMP */
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int __init arch_early_irq_init(void)
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{
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ia64_mca_irq_init();
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return 0;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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unsigned int vectors_in_migration[NR_IRQS];
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/*
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* Since cpu_online_mask is already updated, we just need to check for
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* affinity that has zeros
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*/
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static void migrate_irqs(void)
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{
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int irq, new_cpu;
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for (irq=0; irq < NR_IRQS; irq++) {
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struct irq_desc *desc = irq_to_desc(irq);
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struct irq_data *data = irq_desc_get_irq_data(desc);
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struct irq_chip *chip = irq_data_get_irq_chip(data);
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if (irqd_irq_disabled(data))
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continue;
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/*
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* No handling for now.
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* TBD: Implement a disable function so we can now
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* tell CPU not to respond to these local intr sources.
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* such as ITV,CPEI,MCA etc.
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*/
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if (irqd_is_per_cpu(data))
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continue;
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if (cpumask_any_and(irq_data_get_affinity_mask(data),
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cpu_online_mask) >= nr_cpu_ids) {
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/*
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* Save it for phase 2 processing
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*/
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vectors_in_migration[irq] = irq;
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new_cpu = cpumask_any(cpu_online_mask);
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/*
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* Al three are essential, currently WARN_ON.. maybe panic?
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*/
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if (chip && chip->irq_disable &&
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chip->irq_enable && chip->irq_set_affinity) {
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chip->irq_disable(data);
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chip->irq_set_affinity(data,
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cpumask_of(new_cpu), false);
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chip->irq_enable(data);
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} else {
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WARN_ON((!chip || !chip->irq_disable ||
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!chip->irq_enable ||
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!chip->irq_set_affinity));
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}
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}
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}
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}
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void fixup_irqs(void)
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{
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unsigned int irq;
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extern void ia64_process_pending_intr(void);
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extern volatile int time_keeper_id;
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/* Mask ITV to disable timer */
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ia64_set_itv(1 << 16);
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/*
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* Find a new timesync master
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*/
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if (smp_processor_id() == time_keeper_id) {
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time_keeper_id = cpumask_first(cpu_online_mask);
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printk ("CPU %d is now promoted to time-keeper master\n", time_keeper_id);
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}
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/*
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* Phase 1: Locate IRQs bound to this cpu and
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* relocate them for cpu removal.
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*/
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migrate_irqs();
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/*
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* Phase 2: Perform interrupt processing for all entries reported in
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* local APIC.
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*/
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ia64_process_pending_intr();
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/*
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* Phase 3: Now handle any interrupts not captured in local APIC.
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* This is to account for cases that device interrupted during the time the
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* rte was being disabled and re-programmed.
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*/
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for (irq=0; irq < NR_IRQS; irq++) {
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if (vectors_in_migration[irq]) {
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struct pt_regs *old_regs = set_irq_regs(NULL);
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vectors_in_migration[irq]=0;
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generic_handle_irq(irq);
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set_irq_regs(old_regs);
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}
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}
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/*
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* Now let processor die. We do irq disable and max_xtp() to
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* ensure there is no more interrupts routed to this processor.
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* But the local timer interrupt can have 1 pending which we
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* take care in timer_interrupt().
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*/
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max_xtp();
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local_irq_disable();
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}
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#endif
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