Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Derived from arch/i386/kernel/irq.c |
| 3 | * Copyright (C) 1992 Linus Torvalds |
| 4 | * Adapted from arch/i386 by Gary Thomas |
| 5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 6 | * Updated and modified by Cort Dougan <cort@fsmlabs.com> |
| 7 | * Copyright (C) 1996-2001 Cort Dougan |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Adapted for Power Macintosh by Paul Mackerras |
| 9 | * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) |
| 10 | * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 11 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | * |
| 17 | * This file contains the code used by various IRQ handling routines: |
| 18 | * asking for different IRQ's should be done through these routines |
| 19 | * instead of just grabbing them. Thus setups with different IRQ numbers |
| 20 | * shouldn't result in any weird surprises, and installing new handlers |
| 21 | * should be easier. |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 22 | * |
| 23 | * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the |
| 24 | * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit |
| 25 | * mask register (of which only 16 are defined), hence the weird shifting |
| 26 | * and complement of the cached_irq_mask. I want to be able to stuff |
| 27 | * this right into the SIU SMASK register. |
| 28 | * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx |
| 29 | * to reduce code space and undefined function references. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | */ |
| 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/module.h> |
| 33 | #include <linux/threads.h> |
| 34 | #include <linux/kernel_stat.h> |
| 35 | #include <linux/signal.h> |
| 36 | #include <linux/sched.h> |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 37 | #include <linux/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/ioport.h> |
| 39 | #include <linux/interrupt.h> |
| 40 | #include <linux/timex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/init.h> |
| 42 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/delay.h> |
| 44 | #include <linux/irq.h> |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 45 | #include <linux/seq_file.h> |
| 46 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/profile.h> |
| 48 | #include <linux/bitops.h> |
Jake Moilanen | 204face | 2006-06-07 16:15:10 -0500 | [diff] [blame] | 49 | #include <linux/pci.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | #include <asm/uaccess.h> |
| 52 | #include <asm/system.h> |
| 53 | #include <asm/io.h> |
| 54 | #include <asm/pgtable.h> |
| 55 | #include <asm/irq.h> |
| 56 | #include <asm/cache.h> |
| 57 | #include <asm/prom.h> |
| 58 | #include <asm/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <asm/machdep.h> |
Stephen Rothwell | a50b56d | 2005-11-17 16:14:17 +1100 | [diff] [blame] | 60 | #ifdef CONFIG_PPC_ISERIES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <asm/paca.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #endif |
| 63 | |
Stephen Rothwell | 868accb | 2005-11-10 18:38:46 +1100 | [diff] [blame] | 64 | int __irq_offset_value; |
| 65 | #ifdef CONFIG_PPC32 |
| 66 | EXPORT_SYMBOL(__irq_offset_value); |
| 67 | #endif |
| 68 | |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 69 | static int ppc_spurious_interrupts; |
| 70 | |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 71 | #ifdef CONFIG_PPC32 |
| 72 | #define NR_MASK_WORDS ((NR_IRQS + 31) / 32) |
| 73 | |
| 74 | unsigned long ppc_cached_irq_mask[NR_MASK_WORDS]; |
| 75 | atomic_t ppc_n_lost_interrupts; |
| 76 | |
| 77 | #ifdef CONFIG_TAU_INT |
| 78 | extern int tau_initialized; |
| 79 | extern int tau_interrupts(int); |
| 80 | #endif |
| 81 | |
| 82 | #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE) |
| 83 | extern atomic_t ipi_recv; |
| 84 | extern atomic_t ipi_sent; |
| 85 | #endif |
| 86 | #endif /* CONFIG_PPC32 */ |
| 87 | |
| 88 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | EXPORT_SYMBOL(irq_desc); |
| 90 | |
| 91 | int distribute_irqs = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | u64 ppc64_interrupt_controller; |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 93 | #endif /* CONFIG_PPC64 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | int show_interrupts(struct seq_file *p, void *v) |
| 96 | { |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 97 | int i = *(loff_t *)v, j; |
| 98 | struct irqaction *action; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | irq_desc_t *desc; |
| 100 | unsigned long flags; |
| 101 | |
| 102 | if (i == 0) { |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 103 | seq_puts(p, " "); |
| 104 | for_each_online_cpu(j) |
| 105 | seq_printf(p, "CPU%d ", j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | seq_putc(p, '\n'); |
| 107 | } |
| 108 | |
| 109 | if (i < NR_IRQS) { |
| 110 | desc = get_irq_desc(i); |
| 111 | spin_lock_irqsave(&desc->lock, flags); |
| 112 | action = desc->action; |
| 113 | if (!action || !action->handler) |
| 114 | goto skip; |
| 115 | seq_printf(p, "%3d: ", i); |
| 116 | #ifdef CONFIG_SMP |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 117 | for_each_online_cpu(j) |
| 118 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | #else |
| 120 | seq_printf(p, "%10u ", kstat_irqs(i)); |
| 121 | #endif /* CONFIG_SMP */ |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 122 | if (desc->chip) |
| 123 | seq_printf(p, " %s ", desc->chip->typename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | else |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 125 | seq_puts(p, " None "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge "); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 127 | seq_printf(p, " %s", action->name); |
| 128 | for (action = action->next; action; action = action->next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | seq_printf(p, ", %s", action->name); |
| 130 | seq_putc(p, '\n'); |
| 131 | skip: |
| 132 | spin_unlock_irqrestore(&desc->lock, flags); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 133 | } else if (i == NR_IRQS) { |
| 134 | #ifdef CONFIG_PPC32 |
| 135 | #ifdef CONFIG_TAU_INT |
| 136 | if (tau_initialized){ |
| 137 | seq_puts(p, "TAU: "); |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 138 | for_each_online_cpu(j) |
| 139 | seq_printf(p, "%10u ", tau_interrupts(j)); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 140 | seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n"); |
| 141 | } |
| 142 | #endif |
| 143 | #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE) |
| 144 | /* should this be per processor send/receive? */ |
| 145 | seq_printf(p, "IPI (recv/sent): %10u/%u\n", |
| 146 | atomic_read(&ipi_recv), atomic_read(&ipi_sent)); |
| 147 | #endif |
| 148 | #endif /* CONFIG_PPC32 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 150 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | #ifdef CONFIG_HOTPLUG_CPU |
| 155 | void fixup_irqs(cpumask_t map) |
| 156 | { |
| 157 | unsigned int irq; |
| 158 | static int warned; |
| 159 | |
| 160 | for_each_irq(irq) { |
| 161 | cpumask_t mask; |
| 162 | |
| 163 | if (irq_desc[irq].status & IRQ_PER_CPU) |
| 164 | continue; |
| 165 | |
Ingo Molnar | a53da52 | 2006-06-29 02:24:38 -0700 | [diff] [blame] | 166 | cpus_and(mask, irq_desc[irq].affinity, map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | if (any_online_cpu(mask) == NR_CPUS) { |
| 168 | printk("Breaking affinity for irq %i\n", irq); |
| 169 | mask = map; |
| 170 | } |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 171 | if (irq_desc[irq].chip->set_affinity) |
| 172 | irq_desc[irq].chip->set_affinity(irq, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | else if (irq_desc[irq].action && !(warned++)) |
| 174 | printk("Cannot set affinity for irq %i\n", irq); |
| 175 | } |
| 176 | |
| 177 | local_irq_enable(); |
| 178 | mdelay(1); |
| 179 | local_irq_disable(); |
| 180 | } |
| 181 | #endif |
| 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | void do_IRQ(struct pt_regs *regs) |
| 184 | { |
| 185 | int irq; |
Stephen Rothwell | b709c08 | 2005-11-09 13:28:33 +1100 | [diff] [blame] | 186 | #ifdef CONFIG_IRQSTACKS |
| 187 | struct thread_info *curtp, *irqtp; |
| 188 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 190 | irq_enter(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
| 193 | /* Debugging check for stack overflow: is there less than 2KB free? */ |
| 194 | { |
| 195 | long sp; |
| 196 | |
| 197 | sp = __get_SP() & (THREAD_SIZE-1); |
| 198 | |
| 199 | if (unlikely(sp < (sizeof(struct thread_info) + 2048))) { |
| 200 | printk("do_IRQ: stack overflow: %ld\n", |
| 201 | sp - sizeof(struct thread_info)); |
| 202 | dump_stack(); |
| 203 | } |
| 204 | } |
| 205 | #endif |
| 206 | |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 207 | /* |
| 208 | * Every platform is required to implement ppc_md.get_irq. |
| 209 | * This function will either return an irq number or -1 to |
| 210 | * indicate there are no more pending. |
| 211 | * The value -2 is for buggy hardware and means that this IRQ |
| 212 | * has already been handled. -- Tom |
| 213 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | irq = ppc_md.get_irq(regs); |
| 215 | |
Stephen Rothwell | b709c08 | 2005-11-09 13:28:33 +1100 | [diff] [blame] | 216 | if (irq >= 0) { |
| 217 | #ifdef CONFIG_IRQSTACKS |
| 218 | /* Switch to the irq stack to handle this */ |
| 219 | curtp = current_thread_info(); |
| 220 | irqtp = hardirq_ctx[smp_processor_id()]; |
| 221 | if (curtp != irqtp) { |
| 222 | irqtp->task = curtp->task; |
| 223 | irqtp->flags = 0; |
Stephen Rothwell | d4be4f3 | 2005-11-09 16:19:53 +1100 | [diff] [blame] | 224 | call___do_IRQ(irq, regs, irqtp); |
Stephen Rothwell | b709c08 | 2005-11-09 13:28:33 +1100 | [diff] [blame] | 225 | irqtp->task = NULL; |
| 226 | if (irqtp->flags) |
| 227 | set_bits(irqtp->flags, &curtp->flags); |
| 228 | } else |
| 229 | #endif |
Stephen Rothwell | d4be4f3 | 2005-11-09 16:19:53 +1100 | [diff] [blame] | 230 | __do_IRQ(irq, regs); |
Stephen Rothwell | e199500 | 2005-11-16 18:53:29 +1100 | [diff] [blame] | 231 | } else if (irq != -2) |
| 232 | /* That's not SMP safe ... but who cares ? */ |
| 233 | ppc_spurious_interrupts++; |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 234 | |
Stephen Rothwell | e199500 | 2005-11-16 18:53:29 +1100 | [diff] [blame] | 235 | irq_exit(); |
| 236 | |
| 237 | #ifdef CONFIG_PPC_ISERIES |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 238 | if (get_lppaca()->int_dword.fields.decr_int) { |
| 239 | get_lppaca()->int_dword.fields.decr_int = 0; |
| 240 | /* Signal a fake decrementer interrupt */ |
| 241 | timer_interrupt(regs); |
Stephen Rothwell | e199500 | 2005-11-16 18:53:29 +1100 | [diff] [blame] | 242 | } |
| 243 | #endif |
| 244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | void __init init_IRQ(void) |
| 247 | { |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 248 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | static int once = 0; |
| 250 | |
| 251 | if (once) |
| 252 | return; |
| 253 | |
| 254 | once++; |
| 255 | |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 256 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | ppc_md.init_IRQ(); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 258 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | irq_ctx_init(); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 260 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
| 262 | |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 263 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | /* |
| 265 | * Virtual IRQ mapping code, used on systems with XICS interrupt controllers. |
| 266 | */ |
| 267 | |
| 268 | #define UNDEFINED_IRQ 0xffffffff |
| 269 | unsigned int virt_irq_to_real_map[NR_IRQS]; |
| 270 | |
| 271 | /* |
| 272 | * Don't use virtual irqs 0, 1, 2 for devices. |
| 273 | * The pcnet32 driver considers interrupt numbers < 2 to be invalid, |
| 274 | * and 2 is the XICS IPI interrupt. |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 275 | * We limit virtual irqs to __irq_offet_value less than virt_irq_max so |
| 276 | * that when we offset them we don't end up with an interrupt |
| 277 | * number >= virt_irq_max. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | */ |
| 279 | #define MIN_VIRT_IRQ 3 |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 280 | |
| 281 | unsigned int virt_irq_max; |
| 282 | static unsigned int max_virt_irq; |
| 283 | static unsigned int nr_virt_irqs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | void |
| 286 | virt_irq_init(void) |
| 287 | { |
| 288 | int i; |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 289 | |
| 290 | if ((virt_irq_max == 0) || (virt_irq_max > (NR_IRQS - 1))) |
| 291 | virt_irq_max = NR_IRQS - 1; |
| 292 | max_virt_irq = virt_irq_max - __irq_offset_value; |
| 293 | nr_virt_irqs = max_virt_irq - MIN_VIRT_IRQ + 1; |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | for (i = 0; i < NR_IRQS; i++) |
| 296 | virt_irq_to_real_map[i] = UNDEFINED_IRQ; |
| 297 | } |
| 298 | |
| 299 | /* Create a mapping for a real_irq if it doesn't already exist. |
| 300 | * Return the virtual irq as a convenience. |
| 301 | */ |
| 302 | int virt_irq_create_mapping(unsigned int real_irq) |
| 303 | { |
| 304 | unsigned int virq, first_virq; |
| 305 | static int warned; |
| 306 | |
| 307 | if (ppc64_interrupt_controller == IC_OPEN_PIC) |
| 308 | return real_irq; /* no mapping for openpic (for now) */ |
| 309 | |
Arnd Bergmann | f3f66f5 | 2005-10-31 20:08:37 -0500 | [diff] [blame] | 310 | if (ppc64_interrupt_controller == IC_CELL_PIC) |
Arnd Bergmann | fef1c77 | 2005-06-23 09:43:37 +1000 | [diff] [blame] | 311 | return real_irq; /* no mapping for iic either */ |
| 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | /* don't map interrupts < MIN_VIRT_IRQ */ |
| 314 | if (real_irq < MIN_VIRT_IRQ) { |
| 315 | virt_irq_to_real_map[real_irq] = real_irq; |
| 316 | return real_irq; |
| 317 | } |
| 318 | |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 319 | /* map to a number between MIN_VIRT_IRQ and max_virt_irq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | virq = real_irq; |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 321 | if (virq > max_virt_irq) |
| 322 | virq = (virq % nr_virt_irqs) + MIN_VIRT_IRQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | /* search for this number or a free slot */ |
| 325 | first_virq = virq; |
| 326 | while (virt_irq_to_real_map[virq] != UNDEFINED_IRQ) { |
| 327 | if (virt_irq_to_real_map[virq] == real_irq) |
| 328 | return virq; |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 329 | if (++virq > max_virt_irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | virq = MIN_VIRT_IRQ; |
| 331 | if (virq == first_virq) |
| 332 | goto nospace; /* oops, no free slots */ |
| 333 | } |
| 334 | |
| 335 | virt_irq_to_real_map[virq] = real_irq; |
| 336 | return virq; |
| 337 | |
| 338 | nospace: |
| 339 | if (!warned) { |
| 340 | printk(KERN_CRIT "Interrupt table is full\n"); |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 341 | printk(KERN_CRIT "Increase virt_irq_max (currently %d) " |
| 342 | "in your kernel sources and rebuild.\n", virt_irq_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | warned = 1; |
| 344 | } |
| 345 | return NO_IRQ; |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * In most cases will get a hit on the very first slot checked in the |
| 350 | * virt_irq_to_real_map. Only when there are a large number of |
| 351 | * IRQs will this be expensive. |
| 352 | */ |
| 353 | unsigned int real_irq_to_virt_slowpath(unsigned int real_irq) |
| 354 | { |
| 355 | unsigned int virq; |
| 356 | unsigned int first_virq; |
| 357 | |
| 358 | virq = real_irq; |
| 359 | |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 360 | if (virq > max_virt_irq) |
| 361 | virq = (virq % nr_virt_irqs) + MIN_VIRT_IRQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | first_virq = virq; |
| 364 | |
| 365 | do { |
| 366 | if (virt_irq_to_real_map[virq] == real_irq) |
| 367 | return virq; |
| 368 | |
| 369 | virq++; |
| 370 | |
Stephen Rothwell | 7d01c88 | 2006-04-04 14:49:48 +1000 | [diff] [blame] | 371 | if (virq >= max_virt_irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | virq = 0; |
| 373 | |
| 374 | } while (first_virq != virq); |
| 375 | |
| 376 | return NO_IRQ; |
| 377 | |
| 378 | } |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 379 | #endif /* CONFIG_PPC64 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | #ifdef CONFIG_IRQSTACKS |
Andreas Mohr | 2272205 | 2006-06-23 02:05:30 -0700 | [diff] [blame] | 382 | struct thread_info *softirq_ctx[NR_CPUS] __read_mostly; |
| 383 | struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | void irq_ctx_init(void) |
| 386 | { |
| 387 | struct thread_info *tp; |
| 388 | int i; |
| 389 | |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 390 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | memset((void *)softirq_ctx[i], 0, THREAD_SIZE); |
| 392 | tp = softirq_ctx[i]; |
| 393 | tp->cpu = i; |
| 394 | tp->preempt_count = SOFTIRQ_OFFSET; |
| 395 | |
| 396 | memset((void *)hardirq_ctx[i], 0, THREAD_SIZE); |
| 397 | tp = hardirq_ctx[i]; |
| 398 | tp->cpu = i; |
| 399 | tp->preempt_count = HARDIRQ_OFFSET; |
| 400 | } |
| 401 | } |
| 402 | |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 403 | static inline void do_softirq_onstack(void) |
| 404 | { |
| 405 | struct thread_info *curtp, *irqtp; |
| 406 | |
| 407 | curtp = current_thread_info(); |
| 408 | irqtp = softirq_ctx[smp_processor_id()]; |
| 409 | irqtp->task = curtp->task; |
| 410 | call_do_softirq(irqtp); |
| 411 | irqtp->task = NULL; |
| 412 | } |
| 413 | |
| 414 | #else |
| 415 | #define do_softirq_onstack() __do_softirq() |
| 416 | #endif /* CONFIG_IRQSTACKS */ |
| 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | void do_softirq(void) |
| 419 | { |
| 420 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
| 422 | if (in_interrupt()) |
| 423 | return; |
| 424 | |
| 425 | local_irq_save(flags); |
| 426 | |
| 427 | if (local_softirq_pending()) { |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 428 | account_system_vtime(current); |
| 429 | local_bh_disable(); |
| 430 | do_softirq_onstack(); |
| 431 | account_system_vtime(current); |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame^] | 432 | _local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | local_irq_restore(flags); |
| 436 | } |
| 437 | EXPORT_SYMBOL(do_softirq); |
| 438 | |
Jake Moilanen | 204face | 2006-06-07 16:15:10 -0500 | [diff] [blame] | 439 | #ifdef CONFIG_PCI_MSI |
| 440 | int pci_enable_msi(struct pci_dev * pdev) |
| 441 | { |
| 442 | if (ppc_md.enable_msi) |
| 443 | return ppc_md.enable_msi(pdev); |
| 444 | else |
| 445 | return -1; |
| 446 | } |
| 447 | |
| 448 | void pci_disable_msi(struct pci_dev * pdev) |
| 449 | { |
| 450 | if (ppc_md.disable_msi) |
| 451 | ppc_md.disable_msi(pdev); |
| 452 | } |
| 453 | |
| 454 | void pci_scan_msi_device(struct pci_dev *dev) {} |
| 455 | int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;} |
| 456 | void pci_disable_msix(struct pci_dev *dev) {} |
| 457 | void msi_remove_pci_irq_vectors(struct pci_dev *dev) {} |
| 458 | void disable_msi_mode(struct pci_dev *dev, int pos, int type) {} |
| 459 | void pci_no_msi(void) {} |
| 460 | |
| 461 | #endif |
| 462 | |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 463 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | static int __init setup_noirqdistrib(char *str) |
| 465 | { |
| 466 | distribute_irqs = 0; |
| 467 | return 1; |
| 468 | } |
| 469 | |
| 470 | __setup("noirqdistrib", setup_noirqdistrib); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 471 | #endif /* CONFIG_PPC64 */ |