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Diffstat (limited to 'arch/ia64/kernel/irq.c')
| -rw-r--r-- | arch/ia64/kernel/irq.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c deleted file mode 100644 index 275b9ea58c..0000000000 --- a/arch/ia64/kernel/irq.c +++ /dev/null @@ -1,181 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * linux/arch/ia64/kernel/irq.c - * - * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar - * - * This file contains the code used by various IRQ handling routines: - * asking for different IRQs should be done through these routines - * instead of just grabbing them. Thus setups with different IRQ numbers - * shouldn't result in any weird surprises, and installing new handlers - * should be easier. - * - * Copyright (C) Ashok Raj<ashok.raj@intel.com>, Intel Corporation 2004 - * - * 4/14/2004: Added code to handle cpu migration and do safe irq - * migration without losing interrupts for iosapic - * architecture. - */ - -#include <asm/delay.h> -#include <linux/uaccess.h> -#include <linux/module.h> -#include <linux/seq_file.h> -#include <linux/interrupt.h> -#include <linux/kernel_stat.h> - -#include <asm/mca.h> -#include <asm/xtp.h> - -/* - * 'what should we do if we get a hw irq event on an illegal vector'. - * each architecture has to answer this themselves. - */ -void ack_bad_irq(unsigned int irq) -{ - printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id()); -} - -/* - * Interrupt statistics: - */ - -atomic_t irq_err_count; - -/* - * /proc/interrupts printing: - */ -int arch_show_interrupts(struct seq_file *p, int prec) -{ - seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); - return 0; -} - -#ifdef CONFIG_SMP -static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 }; - -void set_irq_affinity_info (unsigned int irq, int hwid, int redir) -{ - if (irq < NR_IRQS) { - irq_data_update_affinity(irq_get_irq_data(irq), - cpumask_of(cpu_logical_id(hwid))); - irq_redir[irq] = (char) (redir & 0xff); - } -} -#endif /* CONFIG_SMP */ - -int __init arch_early_irq_init(void) -{ - ia64_mca_irq_init(); - return 0; -} - -#ifdef CONFIG_HOTPLUG_CPU -unsigned int vectors_in_migration[NR_IRQS]; - -/* - * Since cpu_online_mask is already updated, we just need to check for - * affinity that has zeros - */ -static void migrate_irqs(void) -{ - int irq, new_cpu; - - for (irq=0; irq < NR_IRQS; irq++) { - struct irq_desc *desc = irq_to_desc(irq); - struct irq_data *data = irq_desc_get_irq_data(desc); - struct irq_chip *chip = irq_data_get_irq_chip(data); - - if (irqd_irq_disabled(data)) - continue; - - /* - * No handling for now. - * TBD: Implement a disable function so we can now - * tell CPU not to respond to these local intr sources. - * such as ITV,CPEI,MCA etc. - */ - if (irqd_is_per_cpu(data)) - continue; - - if (cpumask_any_and(irq_data_get_affinity_mask(data), - cpu_online_mask) >= nr_cpu_ids) { - /* - * Save it for phase 2 processing - */ - vectors_in_migration[irq] = irq; - - new_cpu = cpumask_any(cpu_online_mask); - - /* - * Al three are essential, currently WARN_ON.. maybe panic? - */ - if (chip && chip->irq_disable && - chip->irq_enable && chip->irq_set_affinity) { - chip->irq_disable(data); - chip->irq_set_affinity(data, - cpumask_of(new_cpu), false); - chip->irq_enable(data); - } else { - WARN_ON((!chip || !chip->irq_disable || - !chip->irq_enable || - !chip->irq_set_affinity)); - } - } - } -} - -void fixup_irqs(void) -{ - unsigned int irq; - extern void ia64_process_pending_intr(void); - extern volatile int time_keeper_id; - - /* Mask ITV to disable timer */ - ia64_set_itv(1 << 16); - - /* - * Find a new timesync master - */ - if (smp_processor_id() == time_keeper_id) { - time_keeper_id = cpumask_first(cpu_online_mask); - printk ("CPU %d is now promoted to time-keeper master\n", time_keeper_id); - } - - /* - * Phase 1: Locate IRQs bound to this cpu and - * relocate them for cpu removal. - */ - migrate_irqs(); - - /* - * Phase 2: Perform interrupt processing for all entries reported in - * local APIC. - */ - ia64_process_pending_intr(); - - /* - * Phase 3: Now handle any interrupts not captured in local APIC. - * This is to account for cases that device interrupted during the time the - * rte was being disabled and re-programmed. - */ - for (irq=0; irq < NR_IRQS; irq++) { - if (vectors_in_migration[irq]) { - struct pt_regs *old_regs = set_irq_regs(NULL); - - vectors_in_migration[irq]=0; - generic_handle_irq(irq); - set_irq_regs(old_regs); - } - } - - /* - * Now let processor die. We do irq disable and max_xtp() to - * ensure there is no more interrupts routed to this processor. - * But the local timer interrupt can have 1 pending which we - * take care in timer_interrupt(). - */ - max_xtp(); - local_irq_disable(); -} -#endif |