arch/powerpc/kernel/irq.c

   1 /*
   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)
   6  *  Updated and modified by Cort Dougan <cort@fsmlabs.com>
   7  *    Copyright (C) 1996-2001 Cort Dougan
   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).
  11  *
  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.
  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.
  30  */
  31
  32 #undef DEBUG
  33
  34 #include <linux/module.h>
  35 #include <linux/threads.h>
  36 #include <linux/kernel_stat.h>
  37 #include <linux/signal.h>
  38 #include <linux/sched.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/ioport.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/timex.h>
  43 #include <linux/init.h>
  44 #include <linux/slab.h>
  45 #include <linux/delay.h>
  46 #include <linux/irq.h>
  47 #include <linux/seq_file.h>
  48 #include <linux/cpumask.h>
  49 #include <linux/profile.h>
  50 #include <linux/bitops.h>
  51 #include <linux/list.h>
  52 #include <linux/radix-tree.h>
  53 #include <linux/mutex.h>
  54 #include <linux/bootmem.h>
  55 #include <linux/pci.h>
  56
  57 #include <asm/uaccess.h>
  58 #include <asm/system.h>
  59 #include <asm/io.h>
  60 #include <asm/pgtable.h>
  61 #include <asm/irq.h>
  62 #include <asm/cache.h>
  63 #include <asm/prom.h>
  64 #include <asm/ptrace.h>
  65 #include <asm/machdep.h>
  66 #include <asm/udbg.h>
  67 #ifdef CONFIG_PPC_ISERIES
  68 #include <asm/paca.h>
  69 #endif
  70
  71 int __irq_offset_value;
  72 static int ppc_spurious_interrupts;
  73
  74 #ifdef CONFIG_PPC32
  75 EXPORT_SYMBOL(__irq_offset_value);
  76 atomic_t ppc_n_lost_interrupts;
  77
  78 #ifndef CONFIG_PPC_MERGE
  79 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
  80 unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
  81 #endif
  82
  83 #ifdef CONFIG_TAU_INT
  84 extern int tau_initialized;
  85 extern int tau_interrupts(int);
  86 #endif
  87 #endif /* CONFIG_PPC32 */
  88
  89 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
  90 extern atomic_t ipi_recv;
  91 extern atomic_t ipi_sent;
  92 #endif
  93
  94 #ifdef CONFIG_PPC64
  95 EXPORT_SYMBOL(irq_desc);
  96
  97 int distribute_irqs = 1;
  98 #endif /* CONFIG_PPC64 */
  99
 100 int show_interrupts(struct seq_file *p, void *v)
 101 {
 102         int i = *(loff_t *)v, j;
 103         struct irqaction *action;
 104         irq_desc_t *desc;
 105         unsigned long flags;
 106
 107         if (i == 0) {
 108                 seq_puts(p, "           ");
 109                 for_each_online_cpu(j)
 110                         seq_printf(p, "CPU%d       ", j);
 111                 seq_putc(p, '\n');
 112         }
 113
 114         if (i < NR_IRQS) {
 115                 desc = get_irq_desc(i);
 116                 spin_lock_irqsave(&desc->lock, flags);
 117                 action = desc->action;
 118                 if (!action || !action->handler)
 119                         goto skip;
 120                 seq_printf(p, "%3d: ", i);
 121 #ifdef CONFIG_SMP
 122                 for_each_online_cpu(j)
 123                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 124 #else
 125                 seq_printf(p, "%10u ", kstat_irqs(i));
 126 #endif /* CONFIG_SMP */
 127                 if (desc->chip)
 128                         seq_printf(p, " %s ", desc->chip->typename);
 129                 else
 130                         seq_puts(p, "  None      ");
 131                 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge  ");
 132                 seq_printf(p, "    %s", action->name);
 133                 for (action = action->next; action; action = action->next)
 134                         seq_printf(p, ", %s", action->name);
 135                 seq_putc(p, '\n');
 136 skip:
 137                 spin_unlock_irqrestore(&desc->lock, flags);
 138         } else if (i == NR_IRQS) {
 139 #ifdef CONFIG_PPC32
 140 #ifdef CONFIG_TAU_INT
 141                 if (tau_initialized){
 142                         seq_puts(p, "TAU: ");
 143                         for_each_online_cpu(j)
 144                                 seq_printf(p, "%10u ", tau_interrupts(j));
 145                         seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
 146                 }
 147 #endif
 148 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
 149                 /* should this be per processor send/receive? */
 150                 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
 151                                 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
 152 #endif
 153 #endif /* CONFIG_PPC32 */
 154                 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
 155         }
 156         return 0;
 157 }
 158
 159 #ifdef CONFIG_HOTPLUG_CPU
 160 void fixup_irqs(cpumask_t map)
 161 {
 162         unsigned int irq;
 163         static int warned;
 164
 165         for_each_irq(irq) {
 166                 cpumask_t mask;
 167
 168                 if (irq_desc[irq].status & IRQ_PER_CPU)
 169                         continue;
 170
 171                 cpus_and(mask, irq_desc[irq].affinity, map);
 172                 if (any_online_cpu(mask) == NR_CPUS) {
 173                         printk("Breaking affinity for irq %i\n", irq);
 174                         mask = map;
 175                 }
 176                 if (irq_desc[irq].chip->set_affinity)
 177                         irq_desc[irq].chip->set_affinity(irq, mask);
 178                 else if (irq_desc[irq].action && !(warned++))
 179                         printk("Cannot set affinity for irq %i\n", irq);
 180         }
 181
 182         local_irq_enable();
 183         mdelay(1);
 184         local_irq_disable();
 185 }
 186 #endif
 187
 188 void do_IRQ(struct pt_regs *regs)
 189 {
 190         unsigned int irq;
 191 #ifdef CONFIG_IRQSTACKS
 192         struct thread_info *curtp, *irqtp;
 193 #endif
 194
 195         irq_enter();
 196
 197 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 198         /* Debugging check for stack overflow: is there less than 2KB free? */
 199         {
 200                 long sp;
 201
 202                 sp = __get_SP() & (THREAD_SIZE-1);
 203
 204                 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
 205                         printk("do_IRQ: stack overflow: %ld\n",
 206                                 sp - sizeof(struct thread_info));
 207                         dump_stack();
 208                 }
 209         }
 210 #endif
 211
 212         /*
 213          * Every platform is required to implement ppc_md.get_irq.
 214          * This function will either return an irq number or -1 to
 215          * indicate there are no more pending.
 216          * The value -2 is for buggy hardware and means that this IRQ
 217          * has already been handled. -- Tom
 218          */
 219         irq = ppc_md.get_irq(regs);
 220
 221         if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
 222 #ifdef CONFIG_IRQSTACKS
 223                 /* Switch to the irq stack to handle this */
 224                 curtp = current_thread_info();
 225                 irqtp = hardirq_ctx[smp_processor_id()];
 226                 if (curtp != irqtp) {
 227                         struct irq_desc *desc = irq_desc + irq;
 228                         void *handler = desc->handle_irq;
 229                         if (handler == NULL)
 230                                 handler = &__do_IRQ;
 231                         irqtp->task = curtp->task;
 232                         irqtp->flags = 0;
 233                         call_handle_irq(irq, desc, regs, irqtp, handler);
 234                         irqtp->task = NULL;
 235                         if (irqtp->flags)
 236                                 set_bits(irqtp->flags, &curtp->flags);
 237                 } else
 238 #endif
 239                         generic_handle_irq(irq, regs);
 240         } else if (irq != NO_IRQ_IGNORE)
 241                 /* That's not SMP safe ... but who cares ? */
 242                 ppc_spurious_interrupts++;
 243
 244         irq_exit();
 245
 246 #ifdef CONFIG_PPC_ISERIES
 247         if (get_lppaca()->int_dword.fields.decr_int) {
 248                 get_lppaca()->int_dword.fields.decr_int = 0;
 249                 /* Signal a fake decrementer interrupt */
 250                 timer_interrupt(regs);
 251         }
 252 #endif
 253 }
 254
 255 void __init init_IRQ(void)
 256 {
 257         ppc_md.init_IRQ();
 258 #ifdef CONFIG_PPC64
 259         irq_ctx_init();
 260 #endif
 261 }
 262
 263
 264 #ifdef CONFIG_IRQSTACKS
 265 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
 266 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
 267
 268 void irq_ctx_init(void)
 269 {
 270         struct thread_info *tp;
 271         int i;
 272
 273         for_each_possible_cpu(i) {
 274                 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
 275                 tp = softirq_ctx[i];
 276                 tp->cpu = i;
 277                 tp->preempt_count = SOFTIRQ_OFFSET;
 278
 279                 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
 280                 tp = hardirq_ctx[i];
 281                 tp->cpu = i;
 282                 tp->preempt_count = HARDIRQ_OFFSET;
 283         }
 284 }
 285
 286 static inline void do_softirq_onstack(void)
 287 {
 288         struct thread_info *curtp, *irqtp;
 289
 290         curtp = current_thread_info();
 291         irqtp = softirq_ctx[smp_processor_id()];
 292         irqtp->task = curtp->task;
 293         call_do_softirq(irqtp);
 294         irqtp->task = NULL;
 295 }
 296
 297 #else
 298 #define do_softirq_onstack()    __do_softirq()
 299 #endif /* CONFIG_IRQSTACKS */
 300
 301 void do_softirq(void)
 302 {
 303         unsigned long flags;
 304
 305         if (in_interrupt())
 306                 return;
 307
 308         local_irq_save(flags);
 309
 310         if (local_softirq_pending())
 311                 do_softirq_onstack();
 312
 313         local_irq_restore(flags);
 314 }
 315 EXPORT_SYMBOL(do_softirq);
 316
 317
 318 /*
 319  * IRQ controller and virtual interrupts
 320  */
 321
 322 #ifdef CONFIG_PPC_MERGE
 323
 324 static LIST_HEAD(irq_hosts);
 325 static spinlock_t irq_big_lock = SPIN_LOCK_UNLOCKED;
 326 static DEFINE_PER_CPU(unsigned int, irq_radix_reader);
 327 static unsigned int irq_radix_writer;
 328 struct irq_map_entry irq_map[NR_IRQS];
 329 static unsigned int irq_virq_count = NR_IRQS;
 330 static struct irq_host *irq_default_host;
 331
 332 struct irq_host *irq_alloc_host(unsigned int revmap_type,
 333                                 unsigned int revmap_arg,
 334                                 struct irq_host_ops *ops,
 335                                 irq_hw_number_t inval_irq)
 336 {
 337         struct irq_host *host;
 338         unsigned int size = sizeof(struct irq_host);
 339         unsigned int i;
 340         unsigned int *rmap;
 341         unsigned long flags;
 342
 343         /* Allocate structure and revmap table if using linear mapping */
 344         if (revmap_type == IRQ_HOST_MAP_LINEAR)
 345                 size += revmap_arg * sizeof(unsigned int);
 346         if (mem_init_done)
 347                 host = kzalloc(size, GFP_KERNEL);
 348         else {
 349                 host = alloc_bootmem(size);
 350                 if (host)
 351                         memset(host, 0, size);
 352         }
 353         if (host == NULL)
 354                 return NULL;
 355
 356         /* Fill structure */
 357         host->revmap_type = revmap_type;
 358         host->inval_irq = inval_irq;
 359         host->ops = ops;
 360
 361         spin_lock_irqsave(&irq_big_lock, flags);
 362
 363         /* If it's a legacy controller, check for duplicates and
 364          * mark it as allocated (we use irq 0 host pointer for that
 365          */
 366         if (revmap_type == IRQ_HOST_MAP_LEGACY) {
 367                 if (irq_map[0].host != NULL) {
 368                         spin_unlock_irqrestore(&irq_big_lock, flags);
 369                         /* If we are early boot, we can't free the structure,
 370                          * too bad...
 371                          * this will be fixed once slab is made available early
 372                          * instead of the current cruft
 373                          */
 374                         if (mem_init_done)
 375                                 kfree(host);
 376                         return NULL;
 377                 }
 378                 irq_map[0].host = host;
 379         }
 380
 381         list_add(&host->link, &irq_hosts);
 382         spin_unlock_irqrestore(&irq_big_lock, flags);
 383
 384         /* Additional setups per revmap type */
 385         switch(revmap_type) {
 386         case IRQ_HOST_MAP_LEGACY:
 387                 /* 0 is always the invalid number for legacy */
 388                 host->inval_irq = 0;
 389                 /* setup us as the host for all legacy interrupts */
 390                 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
 391                         irq_map[i].hwirq = 0;
 392                         smp_wmb();
 393                         irq_map[i].host = host;
 394                         smp_wmb();
 395
 396                         /* Clear norequest flags */
 397                         get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
 398
 399                         /* Legacy flags are left to default at this point,
 400                          * one can then use irq_create_mapping() to
 401                          * explicitely change them
 402                          */
 403                         ops->map(host, i, i);
 404                 }
 405                 break;
 406         case IRQ_HOST_MAP_LINEAR:
 407                 rmap = (unsigned int *)(host + 1);
 408                 for (i = 0; i < revmap_arg; i++)
 409                         rmap[i] = IRQ_NONE;
 410                 host->revmap_data.linear.size = revmap_arg;
 411                 smp_wmb();
 412                 host->revmap_data.linear.revmap = rmap;
 413                 break;
 414         default:
 415                 break;
 416         }
 417
 418         pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
 419
 420         return host;
 421 }
 422
 423 struct irq_host *irq_find_host(struct device_node *node)
 424 {
 425         struct irq_host *h, *found = NULL;
 426         unsigned long flags;
 427
 428         /* We might want to match the legacy controller last since
 429          * it might potentially be set to match all interrupts in
 430          * the absence of a device node. This isn't a problem so far
 431          * yet though...
 432          */
 433         spin_lock_irqsave(&irq_big_lock, flags);
 434         list_for_each_entry(h, &irq_hosts, link)
 435                 if (h->ops->match == NULL || h->ops->match(h, node)) {
 436                         found = h;
 437                         break;
 438                 }
 439         spin_unlock_irqrestore(&irq_big_lock, flags);
 440         return found;
 441 }
 442 EXPORT_SYMBOL_GPL(irq_find_host);
 443
 444 void irq_set_default_host(struct irq_host *host)
 445 {
 446         pr_debug("irq: Default host set to @0x%p\n", host);
 447
 448         irq_default_host = host;
 449 }
 450
 451 void irq_set_virq_count(unsigned int count)
 452 {
 453         pr_debug("irq: Trying to set virq count to %d\n", count);
 454
 455         BUG_ON(count < NUM_ISA_INTERRUPTS);
 456         if (count < NR_IRQS)
 457                 irq_virq_count = count;
 458 }
 459
 460 /* radix tree not lockless safe ! we use a brlock-type mecanism
 461  * for now, until we can use a lockless radix tree
 462  */
 463 static void irq_radix_wrlock(unsigned long *flags)
 464 {
 465         unsigned int cpu, ok;
 466
 467         spin_lock_irqsave(&irq_big_lock, *flags);
 468         irq_radix_writer = 1;
 469         smp_mb();
 470         do {
 471                 barrier();
 472                 ok = 1;
 473                 for_each_possible_cpu(cpu) {
 474                         if (per_cpu(irq_radix_reader, cpu)) {
 475                                 ok = 0;
 476                                 break;
 477                         }
 478                 }
 479                 if (!ok)
 480                         cpu_relax();
 481         } while(!ok);
 482 }
 483
 484 static void irq_radix_wrunlock(unsigned long flags)
 485 {
 486         smp_wmb();
 487         irq_radix_writer = 0;
 488         spin_unlock_irqrestore(&irq_big_lock, flags);
 489 }
 490
 491 static void irq_radix_rdlock(unsigned long *flags)
 492 {
 493         local_irq_save(*flags);
 494         __get_cpu_var(irq_radix_reader) = 1;
 495         smp_mb();
 496         if (likely(irq_radix_writer == 0))
 497                 return;
 498         __get_cpu_var(irq_radix_reader) = 0;
 499         smp_wmb();
 500         spin_lock(&irq_big_lock);
 501         __get_cpu_var(irq_radix_reader) = 1;
 502         spin_unlock(&irq_big_lock);
 503 }
 504
 505 static void irq_radix_rdunlock(unsigned long flags)
 506 {
 507         __get_cpu_var(irq_radix_reader) = 0;
 508         local_irq_restore(flags);
 509 }
 510
 511
 512 unsigned int irq_create_mapping(struct irq_host *host,
 513                                 irq_hw_number_t hwirq)
 514 {
 515         unsigned int virq, hint;
 516
 517         pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
 518
 519         /* Look for default host if nececssary */
 520         if (host == NULL)
 521                 host = irq_default_host;
 522         if (host == NULL) {
 523                 printk(KERN_WARNING "irq_create_mapping called for"
 524                        " NULL host, hwirq=%lx\n", hwirq);
 525                 WARN_ON(1);
 526                 return NO_IRQ;
 527         }
 528         pr_debug("irq: -> using host @%p\n", host);
 529
 530         /* Check if mapping already exist, if it does, call
 531          * host->ops->map() to update the flags
 532          */
 533         virq = irq_find_mapping(host, hwirq);
 534         if (virq != IRQ_NONE) {
 535                 pr_debug("irq: -> existing mapping on virq %d\n", virq);
 536                 return virq;
 537         }
 538
 539         /* Get a virtual interrupt number */
 540         if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
 541                 /* Handle legacy */
 542                 virq = (unsigned int)hwirq;
 543                 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
 544                         return NO_IRQ;
 545                 return virq;
 546         } else {
 547                 /* Allocate a virtual interrupt number */
 548                 hint = hwirq % irq_virq_count;
 549                 virq = irq_alloc_virt(host, 1, hint);
 550                 if (virq == NO_IRQ) {
 551                         pr_debug("irq: -> virq allocation failed\n");
 552                         return NO_IRQ;
 553                 }
 554         }
 555         pr_debug("irq: -> obtained virq %d\n", virq);
 556
 557         /* Clear IRQ_NOREQUEST flag */
 558         get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
 559
 560         /* map it */
 561         smp_wmb();
 562         irq_map[virq].hwirq = hwirq;
 563         smp_mb();
 564         if (host->ops->map(host, virq, hwirq)) {
 565                 pr_debug("irq: -> mapping failed, freeing\n");
 566                 irq_free_virt(virq, 1);
 567                 return NO_IRQ;
 568         }
 569         return virq;
 570 }
 571 EXPORT_SYMBOL_GPL(irq_create_mapping);
 572
 573 extern unsigned int irq_create_of_mapping(struct device_node *controller,
 574                                           u32 *intspec, unsigned int intsize)
 575 {
 576         struct irq_host *host;
 577         irq_hw_number_t hwirq;
 578         unsigned int type = IRQ_TYPE_NONE;
 579         unsigned int virq;
 580
 581         if (controller == NULL)
 582                 host = irq_default_host;
 583         else
 584                 host = irq_find_host(controller);
 585         if (host == NULL) {
 586                 printk(KERN_WARNING "irq: no irq host found for %s !\n",
 587                        controller->full_name);
 588                 return NO_IRQ;
 589         }
 590
 591         /* If host has no translation, then we assume interrupt line */
 592         if (host->ops->xlate == NULL)
 593                 hwirq = intspec[0];
 594         else {
 595                 if (host->ops->xlate(host, controller, intspec, intsize,
 596                                      &hwirq, &type))
 597                         return NO_IRQ;
 598         }
 599
 600         /* Create mapping */
 601         virq = irq_create_mapping(host, hwirq);
 602         if (virq == NO_IRQ)
 603                 return virq;
 604
 605         /* Set type if specified and different than the current one */
 606         if (type != IRQ_TYPE_NONE &&
 607             type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
 608                 set_irq_type(virq, type);
 609         return virq;
 610 }
 611 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 612
 613 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
 614 {
 615         struct of_irq oirq;
 616
 617         if (of_irq_map_one(dev, index, &oirq))
 618                 return NO_IRQ;
 619
 620         return irq_create_of_mapping(oirq.controller, oirq.specifier,
 621                                      oirq.size);
 622 }
 623 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
 624
 625 void irq_dispose_mapping(unsigned int virq)
 626 {
 627         struct irq_host *host = irq_map[virq].host;
 628         irq_hw_number_t hwirq;
 629         unsigned long flags;
 630
 631         WARN_ON (host == NULL);
 632         if (host == NULL)
 633                 return;
 634
 635         /* Never unmap legacy interrupts */
 636         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
 637                 return;
 638
 639         /* remove chip and handler */
 640         set_irq_chip_and_handler(virq, NULL, NULL);
 641
 642         /* Make sure it's completed */
 643         synchronize_irq(virq);
 644
 645         /* Tell the PIC about it */
 646         if (host->ops->unmap)
 647                 host->ops->unmap(host, virq);
 648         smp_mb();
 649
 650         /* Clear reverse map */
 651         hwirq = irq_map[virq].hwirq;
 652         switch(host->revmap_type) {
 653         case IRQ_HOST_MAP_LINEAR:
 654                 if (hwirq < host->revmap_data.linear.size)
 655                         host->revmap_data.linear.revmap[hwirq] = IRQ_NONE;
 656                 break;
 657         case IRQ_HOST_MAP_TREE:
 658                 /* Check if radix tree allocated yet */
 659                 if (host->revmap_data.tree.gfp_mask == 0)
 660                         break;
 661                 irq_radix_wrlock(&flags);
 662                 radix_tree_delete(&host->revmap_data.tree, hwirq);
 663                 irq_radix_wrunlock(flags);
 664                 break;
 665         }
 666
 667         /* Destroy map */
 668         smp_mb();
 669         irq_map[virq].hwirq = host->inval_irq;
 670
 671         /* Set some flags */
 672         get_irq_desc(virq)->status |= IRQ_NOREQUEST;
 673
 674         /* Free it */
 675         irq_free_virt(virq, 1);
 676 }
 677 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 678
 679 unsigned int irq_find_mapping(struct irq_host *host,
 680                               irq_hw_number_t hwirq)
 681 {
 682         unsigned int i;
 683         unsigned int hint = hwirq % irq_virq_count;
 684
 685         /* Look for default host if nececssary */
 686         if (host == NULL)
 687                 host = irq_default_host;
 688         if (host == NULL)
 689                 return NO_IRQ;
 690
 691         /* legacy -> bail early */
 692         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
 693                 return hwirq;
 694
 695         /* Slow path does a linear search of the map */
 696         if (hint < NUM_ISA_INTERRUPTS)
 697                 hint = NUM_ISA_INTERRUPTS;
 698         i = hint;
 699         do  {
 700                 if (irq_map[i].host == host &&
 701                     irq_map[i].hwirq == hwirq)
 702                         return i;
 703                 i++;
 704                 if (i >= irq_virq_count)
 705                         i = NUM_ISA_INTERRUPTS;
 706         } while(i != hint);
 707         return NO_IRQ;
 708 }
 709 EXPORT_SYMBOL_GPL(irq_find_mapping);
 710
 711
 712 unsigned int irq_radix_revmap(struct irq_host *host,
 713                               irq_hw_number_t hwirq)
 714 {
 715         struct radix_tree_root *tree;
 716         struct irq_map_entry *ptr;
 717         unsigned int virq;
 718         unsigned long flags;
 719
 720         WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
 721
 722         /* Check if the radix tree exist yet. We test the value of
 723          * the gfp_mask for that. Sneaky but saves another int in the
 724          * structure. If not, we fallback to slow mode
 725          */
 726         tree = &host->revmap_data.tree;
 727         if (tree->gfp_mask == 0)
 728                 return irq_find_mapping(host, hwirq);
 729
 730         /* Now try to resolve */
 731         irq_radix_rdlock(&flags);
 732         ptr = radix_tree_lookup(tree, hwirq);
 733         irq_radix_rdunlock(flags);
 734
 735         /* Found it, return */
 736         if (ptr) {
 737                 virq = ptr - irq_map;
 738                 return virq;
 739         }
 740
 741         /* If not there, try to insert it */
 742         virq = irq_find_mapping(host, hwirq);
 743         if (virq != NO_IRQ) {
 744                 irq_radix_wrlock(&flags);
 745                 radix_tree_insert(tree, hwirq, &irq_map[virq]);
 746                 irq_radix_wrunlock(flags);
 747         }
 748         return virq;
 749 }
 750
 751 unsigned int irq_linear_revmap(struct irq_host *host,
 752                                irq_hw_number_t hwirq)
 753 {
 754         unsigned int *revmap;
 755
 756         WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
 757
 758         /* Check revmap bounds */
 759         if (unlikely(hwirq >= host->revmap_data.linear.size))
 760                 return irq_find_mapping(host, hwirq);
 761
 762         /* Check if revmap was allocated */
 763         revmap = host->revmap_data.linear.revmap;
 764         if (unlikely(revmap == NULL))
 765                 return irq_find_mapping(host, hwirq);
 766
 767         /* Fill up revmap with slow path if no mapping found */
 768         if (unlikely(revmap[hwirq] == NO_IRQ))
 769                 revmap[hwirq] = irq_find_mapping(host, hwirq);
 770
 771         return revmap[hwirq];
 772 }
 773
 774 unsigned int irq_alloc_virt(struct irq_host *host,
 775                             unsigned int count,
 776                             unsigned int hint)
 777 {
 778         unsigned long flags;
 779         unsigned int i, j, found = NO_IRQ;
 780         unsigned int limit = irq_virq_count - count;
 781
 782         if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
 783                 return NO_IRQ;
 784
 785         spin_lock_irqsave(&irq_big_lock, flags);
 786
 787         /* Use hint for 1 interrupt if any */
 788         if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
 789             hint < irq_virq_count && irq_map[hint].host == NULL) {
 790                 found = hint;
 791                 goto hint_found;
 792         }
 793
 794         /* Look for count consecutive numbers in the allocatable
 795          * (non-legacy) space
 796          */
 797         for (i = NUM_ISA_INTERRUPTS; i <= limit; ) {
 798                 for (j = i; j < (i + count); j++)
 799                         if (irq_map[j].host != NULL) {
 800                                 i = j + 1;
 801                                 continue;
 802                         }
 803                 found = i;
 804                 break;
 805         }
 806         if (found == NO_IRQ) {
 807                 spin_unlock_irqrestore(&irq_big_lock, flags);
 808                 return NO_IRQ;
 809         }
 810  hint_found:
 811         for (i = found; i < (found + count); i++) {
 812                 irq_map[i].hwirq = host->inval_irq;
 813                 smp_wmb();
 814                 irq_map[i].host = host;
 815         }
 816         spin_unlock_irqrestore(&irq_big_lock, flags);
 817         return found;
 818 }
 819
 820 void irq_free_virt(unsigned int virq, unsigned int count)
 821 {
 822         unsigned long flags;
 823         unsigned int i;
 824
 825         WARN_ON (virq < NUM_ISA_INTERRUPTS);
 826         WARN_ON (count == 0 || (virq + count) > irq_virq_count);
 827
 828         spin_lock_irqsave(&irq_big_lock, flags);
 829         for (i = virq; i < (virq + count); i++) {
 830                 struct irq_host *host;
 831
 832                 if (i < NUM_ISA_INTERRUPTS ||
 833                     (virq + count) > irq_virq_count)
 834                         continue;
 835
 836                 host = irq_map[i].host;
 837                 irq_map[i].hwirq = host->inval_irq;
 838                 smp_wmb();
 839                 irq_map[i].host = NULL;
 840         }
 841         spin_unlock_irqrestore(&irq_big_lock, flags);
 842 }
 843
 844 void irq_early_init(void)
 845 {
 846         unsigned int i;
 847
 848         for (i = 0; i < NR_IRQS; i++)
 849                 get_irq_desc(i)->status |= IRQ_NOREQUEST;
 850 }
 851
 852 /* We need to create the radix trees late */
 853 static int irq_late_init(void)
 854 {
 855         struct irq_host *h;
 856         unsigned long flags;
 857
 858         irq_radix_wrlock(&flags);
 859         list_for_each_entry(h, &irq_hosts, link) {
 860                 if (h->revmap_type == IRQ_HOST_MAP_TREE)
 861                         INIT_RADIX_TREE(&h->revmap_data.tree, GFP_ATOMIC);
 862         }
 863         irq_radix_wrunlock(flags);
 864
 865         return 0;
 866 }
 867 arch_initcall(irq_late_init);
 868
 869 #endif /* CONFIG_PPC_MERGE */
 870
 871 #ifdef CONFIG_PCI_MSI
 872 int pci_enable_msi(struct pci_dev * pdev)
 873 {
 874         if (ppc_md.enable_msi)
 875                 return ppc_md.enable_msi(pdev);
 876         else
 877                 return -1;
 878 }
 879 EXPORT_SYMBOL(pci_enable_msi);
 880
 881 void pci_disable_msi(struct pci_dev * pdev)
 882 {
 883         if (ppc_md.disable_msi)
 884                 ppc_md.disable_msi(pdev);
 885 }
 886 EXPORT_SYMBOL(pci_disable_msi);
 887
 888 void pci_scan_msi_device(struct pci_dev *dev) {}
 889 int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;}
 890 void pci_disable_msix(struct pci_dev *dev) {}
 891 void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
 892 void disable_msi_mode(struct pci_dev *dev, int pos, int type) {}
 893 void pci_no_msi(void) {}
 894 EXPORT_SYMBOL(pci_enable_msix);
 895 EXPORT_SYMBOL(pci_disable_msix);
 896
 897 #endif
 898
 899 #ifdef CONFIG_PPC64
 900 static int __init setup_noirqdistrib(char *str)
 901 {
 902         distribute_irqs = 0;
 903         return 1;
 904 }
 905
 906 __setup("noirqdistrib", setup_noirqdistrib);
 907 #endif /* CONFIG_PPC64 */