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