Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 7 | * asking for different IRQs should be done through these routines |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 15 | * migration without losing interrupts for iosapic |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * architecture. |
| 17 | */ |
| 18 | |
| 19 | #include <asm/delay.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 20 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/module.h> |
| 22 | #include <linux/seq_file.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/kernel_stat.h> |
| 25 | |
Tony Luck | d303e9e | 2013-03-20 10:30:15 -0700 | [diff] [blame] | 26 | #include <asm/mca.h> |
| 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | /* |
| 29 | * 'what should we do if we get a hw irq event on an illegal vector'. |
| 30 | * each architecture has to answer this themselves. |
| 31 | */ |
| 32 | void ack_bad_irq(unsigned int irq) |
| 33 | { |
| 34 | printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id()); |
| 35 | } |
| 36 | |
| 37 | #ifdef CONFIG_IA64_GENERIC |
Kenji Kaneshige | 1115200 | 2007-08-13 10:31:26 -0700 | [diff] [blame] | 38 | ia64_vector __ia64_irq_to_vector(int irq) |
| 39 | { |
| 40 | return irq_cfg[irq].vector; |
| 41 | } |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | unsigned int __ia64_local_vector_to_irq (ia64_vector vec) |
| 44 | { |
Christoph Lameter | 6065a24 | 2014-08-17 12:30:47 -0500 | [diff] [blame] | 45 | return __this_cpu_read(vector_irq[vec]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | } |
| 47 | #endif |
| 48 | |
| 49 | /* |
| 50 | * Interrupt statistics: |
| 51 | */ |
| 52 | |
| 53 | atomic_t irq_err_count; |
| 54 | |
| 55 | /* |
| 56 | * /proc/interrupts printing: |
| 57 | */ |
Thomas Gleixner | e3d7812 | 2011-03-25 21:04:38 +0100 | [diff] [blame] | 58 | int arch_show_interrupts(struct seq_file *p, int prec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
Thomas Gleixner | e3d7812 | 2011-03-25 21:04:38 +0100 | [diff] [blame] | 60 | seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 }; |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | void set_irq_affinity_info (unsigned int irq, int hwid, int redir) |
| 68 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | if (irq < NR_IRQS) { |
Jiang Liu | c42574e | 2015-07-13 20:42:46 +0000 | [diff] [blame] | 70 | cpumask_copy(irq_get_affinity_mask(irq), |
Mike Travis | d3b66bf | 2009-01-04 05:18:00 -0800 | [diff] [blame] | 71 | cpumask_of(cpu_logical_id(hwid))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | irq_redir[irq] = (char) (redir & 0xff); |
| 73 | } |
| 74 | } |
John Keller | 25d6157 | 2007-05-10 22:42:44 -0700 | [diff] [blame] | 75 | |
Mike Travis | d3b66bf | 2009-01-04 05:18:00 -0800 | [diff] [blame] | 76 | bool is_affinity_mask_valid(const struct cpumask *cpumask) |
John Keller | 25d6157 | 2007-05-10 22:42:44 -0700 | [diff] [blame] | 77 | { |
| 78 | if (ia64_platform_is("sn2")) { |
| 79 | /* Only allow one CPU to be specified in the smp_affinity mask */ |
Ingo Molnar | 6bdf197 | 2009-01-03 12:50:46 +0100 | [diff] [blame] | 80 | if (cpumask_weight(cpumask) != 1) |
John Keller | 25d6157 | 2007-05-10 22:42:44 -0700 | [diff] [blame] | 81 | return false; |
| 82 | } |
| 83 | return true; |
| 84 | } |
| 85 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #endif /* CONFIG_SMP */ |
| 87 | |
Tony Luck | d303e9e | 2013-03-20 10:30:15 -0700 | [diff] [blame] | 88 | int __init arch_early_irq_init(void) |
| 89 | { |
| 90 | ia64_mca_irq_init(); |
| 91 | return 0; |
| 92 | } |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #ifdef CONFIG_HOTPLUG_CPU |
| 95 | unsigned int vectors_in_migration[NR_IRQS]; |
| 96 | |
| 97 | /* |
Mike Travis | d3b66bf | 2009-01-04 05:18:00 -0800 | [diff] [blame] | 98 | * Since cpu_online_mask is already updated, we just need to check for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | * affinity that has zeros |
| 100 | */ |
| 101 | static void migrate_irqs(void) |
| 102 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | int irq, new_cpu; |
| 104 | |
| 105 | for (irq=0; irq < NR_IRQS; irq++) { |
Thomas Gleixner | 428a40c | 2011-03-25 20:12:33 +0100 | [diff] [blame] | 106 | struct irq_desc *desc = irq_to_desc(irq); |
| 107 | struct irq_data *data = irq_desc_get_irq_data(desc); |
| 108 | struct irq_chip *chip = irq_data_get_irq_chip(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Thomas Gleixner | f5e5bf0 | 2011-03-25 20:50:49 +0100 | [diff] [blame] | 110 | if (irqd_irq_disabled(data)) |
Magnus Damm | 29a0027 | 2007-02-03 01:13:48 -0800 | [diff] [blame] | 111 | continue; |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | /* |
| 114 | * No handling for now. |
| 115 | * TBD: Implement a disable function so we can now |
| 116 | * tell CPU not to respond to these local intr sources. |
| 117 | * such as ITV,CPEI,MCA etc. |
| 118 | */ |
Thomas Gleixner | 428a40c | 2011-03-25 20:12:33 +0100 | [diff] [blame] | 119 | if (irqd_is_per_cpu(data)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | continue; |
| 121 | |
Jiang Liu | c42574e | 2015-07-13 20:42:46 +0000 | [diff] [blame] | 122 | if (cpumask_any_and(irq_data_get_affinity_mask(data), |
| 123 | cpu_online_mask) >= nr_cpu_ids) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | /* |
| 125 | * Save it for phase 2 processing |
| 126 | */ |
| 127 | vectors_in_migration[irq] = irq; |
| 128 | |
Mike Travis | d3b66bf | 2009-01-04 05:18:00 -0800 | [diff] [blame] | 129 | new_cpu = cpumask_any(cpu_online_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | /* |
| 132 | * Al three are essential, currently WARN_ON.. maybe panic? |
| 133 | */ |
Thomas Gleixner | 428a40c | 2011-03-25 20:12:33 +0100 | [diff] [blame] | 134 | if (chip && chip->irq_disable && |
| 135 | chip->irq_enable && chip->irq_set_affinity) { |
| 136 | chip->irq_disable(data); |
| 137 | chip->irq_set_affinity(data, |
| 138 | cpumask_of(new_cpu), false); |
| 139 | chip->irq_enable(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } else { |
Thomas Gleixner | 428a40c | 2011-03-25 20:12:33 +0100 | [diff] [blame] | 141 | WARN_ON((!chip || !chip->irq_disable || |
| 142 | !chip->irq_enable || |
| 143 | !chip->irq_set_affinity)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | } |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | void fixup_irqs(void) |
| 150 | { |
| 151 | unsigned int irq; |
| 152 | extern void ia64_process_pending_intr(void); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 153 | extern volatile int time_keeper_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Hidetoshi Seto | 751fc78 | 2008-04-30 16:50:43 +0900 | [diff] [blame] | 155 | /* Mask ITV to disable timer */ |
| 156 | ia64_set_itv(1 << 16); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 157 | |
| 158 | /* |
| 159 | * Find a new timesync master |
| 160 | */ |
| 161 | if (smp_processor_id() == time_keeper_id) { |
Mike Travis | d3b66bf | 2009-01-04 05:18:00 -0800 | [diff] [blame] | 162 | time_keeper_id = cpumask_first(cpu_online_mask); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 163 | printk ("CPU %d is now promoted to time-keeper master\n", time_keeper_id); |
| 164 | } |
| 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 167 | * Phase 1: Locate IRQs bound to this cpu and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | * relocate them for cpu removal. |
| 169 | */ |
| 170 | migrate_irqs(); |
| 171 | |
| 172 | /* |
| 173 | * Phase 2: Perform interrupt processing for all entries reported in |
| 174 | * local APIC. |
| 175 | */ |
| 176 | ia64_process_pending_intr(); |
| 177 | |
| 178 | /* |
| 179 | * Phase 3: Now handle any interrupts not captured in local APIC. |
| 180 | * This is to account for cases that device interrupted during the time the |
| 181 | * rte was being disabled and re-programmed. |
| 182 | */ |
| 183 | for (irq=0; irq < NR_IRQS; irq++) { |
| 184 | if (vectors_in_migration[irq]) { |
Tony Luck | 8c1addb | 2006-10-06 10:09:41 -0700 | [diff] [blame] | 185 | struct pt_regs *old_regs = set_irq_regs(NULL); |
| 186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | vectors_in_migration[irq]=0; |
Ingo Molnar | 5fbb004 | 2006-11-16 00:43:07 -0800 | [diff] [blame] | 188 | generic_handle_irq(irq); |
Tony Luck | 8c1addb | 2006-10-06 10:09:41 -0700 | [diff] [blame] | 189 | set_irq_regs(old_regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Now let processor die. We do irq disable and max_xtp() to |
| 195 | * ensure there is no more interrupts routed to this processor. |
| 196 | * But the local timer interrupt can have 1 pending which we |
| 197 | * take care in timer_interrupt(). |
| 198 | */ |
| 199 | max_xtp(); |
| 200 | local_irq_disable(); |
| 201 | } |
| 202 | #endif |