1 /* 2 * linux/arch/ia64/kernel/irq.c 3 * 4 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar 5 * 6 * This file contains the code used by various IRQ handling routines: 7 * asking for different IRQ's should be done through these routines 8 * instead of just grabbing them. Thus setups with different IRQ numbers 9 * shouldn't result in any weird surprises, and installing new handlers 10 * should be easier. 11 * 12 * Copyright (C) Ashok Raj<ashok.raj@intel.com>, Intel Corporation 2004 13 * 14 * 4/14/2004: Added code to handle cpu migration and do safe irq 15 * migration without lossing interrupts for iosapic 16 * architecture. 17 */ 18 19 #include <asm/delay.h> 20 #include <asm/uaccess.h> 21 #include <linux/module.h> 22 #include <linux/seq_file.h> 23 #include <linux/interrupt.h> 24 #include <linux/kernel_stat.h> 25 26 /* 27 * 'what should we do if we get a hw irq event on an illegal vector'. 28 * each architecture has to answer this themselves. 29 */ 30 void ack_bad_irq(unsigned int irq) 31 { 32 printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id()); 33 } 34 35 #ifdef CONFIG_IA64_GENERIC 36 unsigned int __ia64_local_vector_to_irq (ia64_vector vec) 37 { 38 return (unsigned int) vec; 39 } 40 #endif 41 42 /* 43 * Interrupt statistics: 44 */ 45 46 atomic_t irq_err_count; 47 48 /* 49 * /proc/interrupts printing: 50 */ 51 52 int show_interrupts(struct seq_file *p, void *v) 53 { 54 int i = *(loff_t *) v, j; 55 struct irqaction * action; 56 unsigned long flags; 57 58 if (i == 0) { 59 seq_printf(p, " "); 60 for_each_online_cpu(j) { 61 seq_printf(p, "CPU%d ",j); 62 } 63 seq_putc(p, '\n'); 64 } 65 66 if (i < NR_IRQS) { 67 spin_lock_irqsave(&irq_desc[i].lock, flags); 68 action = irq_desc[i].action; 69 if (!action) 70 goto skip; 71 seq_printf(p, "%3d: ",i); 72 #ifndef CONFIG_SMP 73 seq_printf(p, "%10u ", kstat_irqs(i)); 74 #else 75 for_each_online_cpu(j) { 76 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); 77 } 78 #endif 79 seq_printf(p, " %14s", irq_desc[i].handler->typename); 80 seq_printf(p, " %s", action->name); 81 82 for (action=action->next; action; action = action->next) 83 seq_printf(p, ", %s", action->name); 84 85 seq_putc(p, '\n'); 86 skip: 87 spin_unlock_irqrestore(&irq_desc[i].lock, flags); 88 } else if (i == NR_IRQS) 89 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); 90 return 0; 91 } 92 93 #ifdef CONFIG_SMP 94 static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 }; 95 96 void set_irq_affinity_info (unsigned int irq, int hwid, int redir) 97 { 98 cpumask_t mask = CPU_MASK_NONE; 99 100 cpu_set(cpu_logical_id(hwid), mask); 101 102 if (irq < NR_IRQS) { 103 irq_affinity[irq] = mask; 104 set_irq_info(irq, mask); 105 irq_redir[irq] = (char) (redir & 0xff); 106 } 107 } 108 #endif /* CONFIG_SMP */ 109 110 #ifdef CONFIG_HOTPLUG_CPU 111 unsigned int vectors_in_migration[NR_IRQS]; 112 113 /* 114 * Since cpu_online_map is already updated, we just need to check for 115 * affinity that has zeros 116 */ 117 static void migrate_irqs(void) 118 { 119 cpumask_t mask; 120 irq_desc_t *desc; 121 int irq, new_cpu; 122 123 for (irq=0; irq < NR_IRQS; irq++) { 124 desc = irq_descp(irq); 125 126 /* 127 * No handling for now. 128 * TBD: Implement a disable function so we can now 129 * tell CPU not to respond to these local intr sources. 130 * such as ITV,CPEI,MCA etc. 131 */ 132 if (desc->status == IRQ_PER_CPU) 133 continue; 134 135 cpus_and(mask, irq_affinity[irq], cpu_online_map); 136 if (any_online_cpu(mask) == NR_CPUS) { 137 /* 138 * Save it for phase 2 processing 139 */ 140 vectors_in_migration[irq] = irq; 141 142 new_cpu = any_online_cpu(cpu_online_map); 143 mask = cpumask_of_cpu(new_cpu); 144 145 /* 146 * Al three are essential, currently WARN_ON.. maybe panic? 147 */ 148 if (desc->handler && desc->handler->disable && 149 desc->handler->enable && desc->handler->set_affinity) { 150 desc->handler->disable(irq); 151 desc->handler->set_affinity(irq, mask); 152 desc->handler->enable(irq); 153 } else { 154 WARN_ON((!(desc->handler) || !(desc->handler->disable) || 155 !(desc->handler->enable) || 156 !(desc->handler->set_affinity))); 157 } 158 } 159 } 160 } 161 162 void fixup_irqs(void) 163 { 164 unsigned int irq; 165 extern void ia64_process_pending_intr(void); 166 167 ia64_set_itv(1<<16); 168 /* 169 * Phase 1: Locate irq's bound to this cpu and 170 * relocate them for cpu removal. 171 */ 172 migrate_irqs(); 173 174 /* 175 * Phase 2: Perform interrupt processing for all entries reported in 176 * local APIC. 177 */ 178 ia64_process_pending_intr(); 179 180 /* 181 * Phase 3: Now handle any interrupts not captured in local APIC. 182 * This is to account for cases that device interrupted during the time the 183 * rte was being disabled and re-programmed. 184 */ 185 for (irq=0; irq < NR_IRQS; irq++) { 186 if (vectors_in_migration[irq]) { 187 vectors_in_migration[irq]=0; 188 __do_IRQ(irq, NULL); 189 } 190 } 191 192 /* 193 * Now let processor die. We do irq disable and max_xtp() to 194 * ensure there is no more interrupts routed to this processor. 195 * But the local timer interrupt can have 1 pending which we 196 * take care in timer_interrupt(). 197 */ 198 max_xtp(); 199 local_irq_disable(); 200 } 201 #endif 202