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_PPC64
  68 #include <asm/paca.h>
  69 #include <asm/firmware.h>
  70 #endif
  71
  72 int __irq_offset_value;
  73 static int ppc_spurious_interrupts;
  74
  75 #ifdef CONFIG_PPC32
  76 EXPORT_SYMBOL(__irq_offset_value);
  77 atomic_t ppc_n_lost_interrupts;
  78
  79 #ifndef CONFIG_PPC_MERGE
  80 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
  81 unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
  82 #endif
  83
  84 #ifdef CONFIG_TAU_INT
  85 extern int tau_initialized;
  86 extern int tau_interrupts(int);
  87 #endif
  88 #endif /* CONFIG_PPC32 */
  89
  90 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
  91 extern atomic_t ipi_recv;
  92 extern atomic_t ipi_sent;
  93 #endif
  94
  95 #ifdef CONFIG_PPC64
  96 EXPORT_SYMBOL(irq_desc);
  97
  98 int distribute_irqs = 1;
  99
 100 static inline unsigned long get_hard_enabled(void)
 101 {
 102         unsigned long enabled;
 103
 104         __asm__ __volatile__("lbz %0,%1(13)"
 105         : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
 106
 107         return enabled;
 108 }
 109
 110 static inline void set_soft_enabled(unsigned long enable)
 111 {
 112         __asm__ __volatile__("stb %0,%1(13)"
 113         : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
 114 }
 115
 116 void local_irq_restore(unsigned long en)
 117 {
 118         /*
 119          * get_paca()->soft_enabled = en;
 120          * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
 121          * That was allowed before, and in such a case we do need to take care
 122          * that gcc will set soft_enabled directly via r13, not choose to use
 123          * an intermediate register, lest we're preempted to a different cpu.
 124          */
 125         set_soft_enabled(en);
 126         if (!en)
 127                 return;
 128
 129         if (firmware_has_feature(FW_FEATURE_ISERIES)) {
 130                 /*
 131                  * Do we need to disable preemption here?  Not really: in the
 132                  * unlikely event that we're preempted to a different cpu in
 133                  * between getting r13, loading its lppaca_ptr, and loading
 134                  * its any_int, we might call iseries_handle_interrupts without
 135                  * an interrupt pending on the new cpu, but that's no disaster,
 136                  * is it?  And the business of preempting us off the old cpu
 137                  * would itself involve a local_irq_restore which handles the
 138                  * interrupt to that cpu.
 139                  *
 140                  * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
 141                  * to avoid any preemption checking added into get_paca().
 142                  */
 143                 if (local_paca->lppaca_ptr->int_dword.any_int)
 144                         iseries_handle_interrupts();
 145                 return;
 146         }
 147
 148         /*
 149          * if (get_paca()->hard_enabled) return;
 150          * But again we need to take care that gcc gets hard_enabled directly
 151          * via r13, not choose to use an intermediate register, lest we're
 152          * preempted to a different cpu in between the two instructions.
 153          */
 154         if (get_hard_enabled())
 155                 return;
 156
 157         /*
 158          * Need to hard-enable interrupts here.  Since currently disabled,
 159          * no need to take further asm precautions against preemption; but
 160          * use local_paca instead of get_paca() to avoid preemption checking.
 161          */
 162         local_paca->hard_enabled = en;
 163         if ((int)mfspr(SPRN_DEC) < 0)
 164                 mtspr(SPRN_DEC, 1);
 165         hard_irq_enable();
 166 }
 167 #endif /* CONFIG_PPC64 */
 168
 169 int show_interrupts(struct seq_file *p, void *v)
 170 {
 171         int i = *(loff_t *)v, j;
 172         struct irqaction *action;
 173         irq_desc_t *desc;
 174         unsigned long flags;
 175
 176         if (i == 0) {
 177                 seq_puts(p, "           ");
 178                 for_each_online_cpu(j)
 179                         seq_printf(p, "CPU%d       ", j);
 180                 seq_putc(p, '\n');
 181         }
 182
 183         if (i < NR_IRQS) {
 184                 desc = get_irq_desc(i);
 185                 spin_lock_irqsave(&desc->lock, flags);
 186                 action = desc->action;
 187                 if (!action || !action->handler)
 188                         goto skip;
 189                 seq_printf(p, "%3d: ", i);
 190 #ifdef CONFIG_SMP
 191                 for_each_online_cpu(j)
 192                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 193 #else
 194                 seq_printf(p, "%10u ", kstat_irqs(i));
 195 #endif /* CONFIG_SMP */
 196                 if (desc->chip)
 197                         seq_printf(p, " %s ", desc->chip->typename);
 198                 else
 199                         seq_puts(p, "  None      ");
 200                 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge  ");
 201                 seq_printf(p, "    %s", action->name);
 202                 for (action = action->next; action; action = action->next)
 203                         seq_printf(p, ", %s", action->name);
 204                 seq_putc(p, '\n');
 205 skip:
 206                 spin_unlock_irqrestore(&desc->lock, flags);
 207         } else if (i == NR_IRQS) {
 208 #ifdef CONFIG_PPC32
 209 #ifdef CONFIG_TAU_INT
 210                 if (tau_initialized){
 211                         seq_puts(p, "TAU: ");
 212                         for_each_online_cpu(j)
 213                                 seq_printf(p, "%10u ", tau_interrupts(j));
 214                         seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
 215                 }
 216 #endif
 217 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
 218                 /* should this be per processor send/receive? */
 219                 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
 220                                 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
 221 #endif
 222 #endif /* CONFIG_PPC32 */
 223                 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
 224         }
 225         return 0;
 226 }
 227
 228 #ifdef CONFIG_HOTPLUG_CPU
 229 void fixup_irqs(cpumask_t map)
 230 {
 231         unsigned int irq;
 232         static int warned;
 233
 234         for_each_irq(irq) {
 235                 cpumask_t mask;
 236
 237                 if (irq_desc[irq].status & IRQ_PER_CPU)
 238                         continue;
 239
 240                 cpus_and(mask, irq_desc[irq].affinity, map);
 241                 if (any_online_cpu(mask) == NR_CPUS) {
 242                         printk("Breaking affinity for irq %i\n", irq);
 243                         mask = map;
 244                 }
 245                 if (irq_desc[irq].chip->set_affinity)
 246                         irq_desc[irq].chip->set_affinity(irq, mask);
 247                 else if (irq_desc[irq].action && !(warned++))
 248                         printk("Cannot set affinity for irq %i\n", irq);
 249         }
 250
 251         local_irq_enable();
 252         mdelay(1);
 253         local_irq_disable();
 254 }
 255 #endif
 256
 257 void do_IRQ(struct pt_regs *regs)
 258 {
 259         struct pt_regs *old_regs = set_irq_regs(regs);
 260         unsigned int irq;
 261 #ifdef CONFIG_IRQSTACKS
 262         struct thread_info *curtp, *irqtp;
 263 #endif
 264
 265         irq_enter();
 266
 267 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 268         /* Debugging check for stack overflow: is there less than 2KB free? */
 269         {
 270                 long sp;
 271
 272                 sp = __get_SP() & (THREAD_SIZE-1);
 273
 274                 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
 275                         printk("do_IRQ: stack overflow: %ld\n",
 276                                 sp - sizeof(struct thread_info));
 277                         dump_stack();
 278                 }
 279         }
 280 #endif
 281
 282         /*
 283          * Every platform is required to implement ppc_md.get_irq.
 284          * This function will either return an irq number or NO_IRQ to
 285          * indicate there are no more pending.
 286          * The value NO_IRQ_IGNORE is for buggy hardware and means that this
 287          * IRQ has already been handled. -- Tom
 288          */
 289         irq = ppc_md.get_irq();
 290
 291         if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
 292 #ifdef CONFIG_IRQSTACKS
 293                 /* Switch to the irq stack to handle this */
 294                 curtp = current_thread_info();
 295                 irqtp = hardirq_ctx[smp_processor_id()];
 296                 if (curtp != irqtp) {
 297                         struct irq_desc *desc = irq_desc + irq;
 298                         void *handler = desc->handle_irq;
 299                         if (handler == NULL)
 300                                 handler = &__do_IRQ;
 301                         irqtp->task = curtp->task;
 302                         irqtp->flags = 0;
 303                         call_handle_irq(irq, desc, irqtp, handler);
 304                         irqtp->task = NULL;
 305                         if (irqtp->flags)
 306                                 set_bits(irqtp->flags, &curtp->flags);
 307                 } else
 308 #endif
 309                         generic_handle_irq(irq);
 310         } else if (irq != NO_IRQ_IGNORE)
 311                 /* That's not SMP safe ... but who cares ? */
 312                 ppc_spurious_interrupts++;
 313
 314         irq_exit();
 315         set_irq_regs(old_regs);
 316
 317 #ifdef CONFIG_PPC_ISERIES
 318         if (firmware_has_feature(FW_FEATURE_ISERIES) &&
 319                         get_lppaca()->int_dword.fields.decr_int) {
 320                 get_lppaca()->int_dword.fields.decr_int = 0;
 321                 /* Signal a fake decrementer interrupt */
 322                 timer_interrupt(regs);
 323         }
 324 #endif
 325 }
 326
 327 void __init init_IRQ(void)
 328 {
 329         ppc_md.init_IRQ();
 330 #ifdef CONFIG_PPC64
 331         irq_ctx_init();
 332 #endif
 333 }
 334
 335
 336 #ifdef CONFIG_IRQSTACKS
 337 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
 338 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
 339
 340 void irq_ctx_init(void)
 341 {
 342         struct thread_info *tp;
 343         int i;
 344
 345         for_each_possible_cpu(i) {
 346                 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
 347                 tp = softirq_ctx[i];
 348                 tp->cpu = i;
 349                 tp->preempt_count = SOFTIRQ_OFFSET;
 350
 351                 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
 352                 tp = hardirq_ctx[i];
 353                 tp->cpu = i;
 354                 tp->preempt_count = HARDIRQ_OFFSET;
 355         }
 356 }
 357
 358 static inline void do_softirq_onstack(void)
 359 {
 360         struct thread_info *curtp, *irqtp;
 361
 362         curtp = current_thread_info();
 363         irqtp = softirq_ctx[smp_processor_id()];
 364         irqtp->task = curtp->task;
 365         call_do_softirq(irqtp);
 366         irqtp->task = NULL;
 367 }
 368
 369 #else
 370 #define do_softirq_onstack()    __do_softirq()
 371 #endif /* CONFIG_IRQSTACKS */
 372
 373 void do_softirq(void)
 374 {
 375         unsigned long flags;
 376
 377         if (in_interrupt())
 378                 return;
 379
 380         local_irq_save(flags);
 381
 382         if (local_softirq_pending())
 383                 do_softirq_onstack();
 384
 385         local_irq_restore(flags);
 386 }
 387 EXPORT_SYMBOL(do_softirq);
 388
 389
 390 /*
 391  * IRQ controller and virtual interrupts
 392  */
 393
 394 #ifdef CONFIG_PPC_MERGE
 395
 396 static LIST_HEAD(irq_hosts);
 397 static spinlock_t irq_big_lock = SPIN_LOCK_UNLOCKED;
 398 static DEFINE_PER_CPU(unsigned int, irq_radix_reader);
 399 static unsigned int irq_radix_writer;
 400 struct irq_map_entry irq_map[NR_IRQS];
 401 static unsigned int irq_virq_count = NR_IRQS;
 402 static struct irq_host *irq_default_host;
 403
 404 struct irq_host *irq_alloc_host(unsigned int revmap_type,
 405                                 unsigned int revmap_arg,
 406                                 struct irq_host_ops *ops,
 407                                 irq_hw_number_t inval_irq)
 408 {
 409         struct irq_host *host;
 410         unsigned int size = sizeof(struct irq_host);
 411         unsigned int i;
 412         unsigned int *rmap;
 413         unsigned long flags;
 414
 415         /* Allocate structure and revmap table if using linear mapping */
 416         if (revmap_type == IRQ_HOST_MAP_LINEAR)
 417                 size += revmap_arg * sizeof(unsigned int);
 418         if (mem_init_done)
 419                 host = kzalloc(size, GFP_KERNEL);
 420         else {
 421                 host = alloc_bootmem(size);
 422                 if (host)
 423                         memset(host, 0, size);
 424         }
 425         if (host == NULL)
 426                 return NULL;
 427
 428         /* Fill structure */
 429         host->revmap_type = revmap_type;
 430         host->inval_irq = inval_irq;
 431         host->ops = ops;
 432
 433         spin_lock_irqsave(&irq_big_lock, flags);
 434
 435         /* If it's a legacy controller, check for duplicates and
 436          * mark it as allocated (we use irq 0 host pointer for that
 437          */
 438         if (revmap_type == IRQ_HOST_MAP_LEGACY) {
 439                 if (irq_map[0].host != NULL) {
 440                         spin_unlock_irqrestore(&irq_big_lock, flags);
 441                         /* If we are early boot, we can't free the structure,
 442                          * too bad...
 443                          * this will be fixed once slab is made available early
 444                          * instead of the current cruft
 445                          */
 446                         if (mem_init_done)
 447                                 kfree(host);
 448                         return NULL;
 449                 }
 450                 irq_map[0].host = host;
 451         }
 452
 453         list_add(&host->link, &irq_hosts);
 454         spin_unlock_irqrestore(&irq_big_lock, flags);
 455
 456         /* Additional setups per revmap type */
 457         switch(revmap_type) {
 458         case IRQ_HOST_MAP_LEGACY:
 459                 /* 0 is always the invalid number for legacy */
 460                 host->inval_irq = 0;
 461                 /* setup us as the host for all legacy interrupts */
 462                 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
 463                         irq_map[i].hwirq = 0;
 464                         smp_wmb();
 465                         irq_map[i].host = host;
 466                         smp_wmb();
 467
 468                         /* Clear norequest flags */
 469                         get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
 470
 471                         /* Legacy flags are left to default at this point,
 472                          * one can then use irq_create_mapping() to
 473                          * explicitely change them
 474                          */
 475                         ops->map(host, i, i);
 476                 }
 477                 break;
 478         case IRQ_HOST_MAP_LINEAR:
 479                 rmap = (unsigned int *)(host + 1);
 480                 for (i = 0; i < revmap_arg; i++)
 481                         rmap[i] = IRQ_NONE;
 482                 host->revmap_data.linear.size = revmap_arg;
 483                 smp_wmb();
 484                 host->revmap_data.linear.revmap = rmap;
 485                 break;
 486         default:
 487                 break;
 488         }
 489
 490         pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
 491
 492         return host;
 493 }
 494
 495 struct irq_host *irq_find_host(struct device_node *node)
 496 {
 497         struct irq_host *h, *found = NULL;
 498         unsigned long flags;
 499
 500         /* We might want to match the legacy controller last since
 501          * it might potentially be set to match all interrupts in
 502          * the absence of a device node. This isn't a problem so far
 503          * yet though...
 504          */
 505         spin_lock_irqsave(&irq_big_lock, flags);
 506         list_for_each_entry(h, &irq_hosts, link)
 507                 if (h->ops->match == NULL || h->ops->match(h, node)) {
 508                         found = h;
 509                         break;
 510                 }
 511         spin_unlock_irqrestore(&irq_big_lock, flags);
 512         return found;
 513 }
 514 EXPORT_SYMBOL_GPL(irq_find_host);
 515
 516 void irq_set_default_host(struct irq_host *host)
 517 {
 518         pr_debug("irq: Default host set to @0x%p\n", host);
 519
 520         irq_default_host = host;
 521 }
 522
 523 void irq_set_virq_count(unsigned int count)
 524 {
 525         pr_debug("irq: Trying to set virq count to %d\n", count);
 526
 527         BUG_ON(count < NUM_ISA_INTERRUPTS);
 528         if (count < NR_IRQS)
 529                 irq_virq_count = count;
 530 }
 531
 532 /* radix tree not lockless safe ! we use a brlock-type mecanism
 533  * for now, until we can use a lockless radix tree
 534  */
 535 static void irq_radix_wrlock(unsigned long *flags)
 536 {
 537         unsigned int cpu, ok;
 538
 539         spin_lock_irqsave(&irq_big_lock, *flags);
 540         irq_radix_writer = 1;
 541         smp_mb();
 542         do {
 543                 barrier();
 544                 ok = 1;
 545                 for_each_possible_cpu(cpu) {
 546                         if (per_cpu(irq_radix_reader, cpu)) {
 547                                 ok = 0;
 548                                 break;
 549                         }
 550                 }
 551                 if (!ok)
 552                         cpu_relax();
 553         } while(!ok);
 554 }
 555
 556 static void irq_radix_wrunlock(unsigned long flags)
 557 {
 558         smp_wmb();
 559         irq_radix_writer = 0;
 560         spin_unlock_irqrestore(&irq_big_lock, flags);
 561 }
 562
 563 static void irq_radix_rdlock(unsigned long *flags)
 564 {
 565         local_irq_save(*flags);
 566         __get_cpu_var(irq_radix_reader) = 1;
 567         smp_mb();
 568         if (likely(irq_radix_writer == 0))
 569                 return;
 570         __get_cpu_var(irq_radix_reader) = 0;
 571         smp_wmb();
 572         spin_lock(&irq_big_lock);
 573         __get_cpu_var(irq_radix_reader) = 1;
 574         spin_unlock(&irq_big_lock);
 575 }
 576
 577 static void irq_radix_rdunlock(unsigned long flags)
 578 {
 579         __get_cpu_var(irq_radix_reader) = 0;
 580         local_irq_restore(flags);
 581 }
 582
 583
 584 unsigned int irq_create_mapping(struct irq_host *host,
 585                                 irq_hw_number_t hwirq)
 586 {
 587         unsigned int virq, hint;
 588
 589         pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
 590
 591         /* Look for default host if nececssary */
 592         if (host == NULL)
 593                 host = irq_default_host;
 594         if (host == NULL) {
 595                 printk(KERN_WARNING "irq_create_mapping called for"
 596                        " NULL host, hwirq=%lx\n", hwirq);
 597                 WARN_ON(1);
 598                 return NO_IRQ;
 599         }
 600         pr_debug("irq: -> using host @%p\n", host);
 601
 602         /* Check if mapping already exist, if it does, call
 603          * host->ops->map() to update the flags
 604          */
 605         virq = irq_find_mapping(host, hwirq);
 606         if (virq != IRQ_NONE) {
 607                 if (host->ops->remap)
 608                         host->ops->remap(host, virq, hwirq);
 609                 pr_debug("irq: -> existing mapping on virq %d\n", virq);
 610                 return virq;
 611         }
 612
 613         /* Get a virtual interrupt number */
 614         if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
 615                 /* Handle legacy */
 616                 virq = (unsigned int)hwirq;
 617                 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
 618                         return NO_IRQ;
 619                 return virq;
 620         } else {
 621                 /* Allocate a virtual interrupt number */
 622                 hint = hwirq % irq_virq_count;
 623                 virq = irq_alloc_virt(host, 1, hint);
 624                 if (virq == NO_IRQ) {
 625                         pr_debug("irq: -> virq allocation failed\n");
 626                         return NO_IRQ;
 627                 }
 628         }
 629         pr_debug("irq: -> obtained virq %d\n", virq);
 630
 631         /* Clear IRQ_NOREQUEST flag */
 632         get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
 633
 634         /* map it */
 635         smp_wmb();
 636         irq_map[virq].hwirq = hwirq;
 637         smp_mb();
 638         if (host->ops->map(host, virq, hwirq)) {
 639                 pr_debug("irq: -> mapping failed, freeing\n");
 640                 irq_free_virt(virq, 1);
 641                 return NO_IRQ;
 642         }
 643         return virq;
 644 }
 645 EXPORT_SYMBOL_GPL(irq_create_mapping);
 646
 647 unsigned int irq_create_of_mapping(struct device_node *controller,
 648                                    u32 *intspec, unsigned int intsize)
 649 {
 650         struct irq_host *host;
 651         irq_hw_number_t hwirq;
 652         unsigned int type = IRQ_TYPE_NONE;
 653         unsigned int virq;
 654
 655         if (controller == NULL)
 656                 host = irq_default_host;
 657         else
 658                 host = irq_find_host(controller);
 659         if (host == NULL) {
 660                 printk(KERN_WARNING "irq: no irq host found for %s !\n",
 661                        controller->full_name);
 662                 return NO_IRQ;
 663         }
 664
 665         /* If host has no translation, then we assume interrupt line */
 666         if (host->ops->xlate == NULL)
 667                 hwirq = intspec[0];
 668         else {
 669                 if (host->ops->xlate(host, controller, intspec, intsize,
 670                                      &hwirq, &type))
 671                         return NO_IRQ;
 672         }
 673
 674         /* Create mapping */
 675         virq = irq_create_mapping(host, hwirq);
 676         if (virq == NO_IRQ)
 677                 return virq;
 678
 679         /* Set type if specified and different than the current one */
 680         if (type != IRQ_TYPE_NONE &&
 681             type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
 682                 set_irq_type(virq, type);
 683         return virq;
 684 }
 685 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 686
 687 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
 688 {
 689         struct of_irq oirq;
 690
 691         if (of_irq_map_one(dev, index, &oirq))
 692                 return NO_IRQ;
 693
 694         return irq_create_of_mapping(oirq.controller, oirq.specifier,
 695                                      oirq.size);
 696 }
 697 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
 698
 699 void irq_dispose_mapping(unsigned int virq)
 700 {
 701         struct irq_host *host;
 702         irq_hw_number_t hwirq;
 703         unsigned long flags;
 704
 705         if (virq == NO_IRQ)
 706                 return;
 707
 708         host = irq_map[virq].host;
 709         WARN_ON (host == NULL);
 710         if (host == NULL)
 711                 return;
 712
 713         /* Never unmap legacy interrupts */
 714         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
 715                 return;
 716
 717         /* remove chip and handler */
 718         set_irq_chip_and_handler(virq, NULL, NULL);
 719
 720         /* Make sure it's completed */
 721         synchronize_irq(virq);
 722
 723         /* Tell the PIC about it */
 724         if (host->ops->unmap)
 725                 host->ops->unmap(host, virq);
 726         smp_mb();
 727
 728         /* Clear reverse map */
 729         hwirq = irq_map[virq].hwirq;
 730         switch(host->revmap_type) {
 731         case IRQ_HOST_MAP_LINEAR:
 732                 if (hwirq < host->revmap_data.linear.size)
 733                         host->revmap_data.linear.revmap[hwirq] = IRQ_NONE;
 734                 break;
 735         case IRQ_HOST_MAP_TREE:
 736                 /* Check if radix tree allocated yet */
 737                 if (host->revmap_data.tree.gfp_mask == 0)
 738                         break;
 739                 irq_radix_wrlock(&flags);
 740                 radix_tree_delete(&host->revmap_data.tree, hwirq);
 741                 irq_radix_wrunlock(flags);
 742                 break;
 743         }
 744
 745         /* Destroy map */
 746         smp_mb();
 747         irq_map[virq].hwirq = host->inval_irq;
 748
 749         /* Set some flags */
 750         get_irq_desc(virq)->status |= IRQ_NOREQUEST;
 751
 752         /* Free it */
 753         irq_free_virt(virq, 1);
 754 }
 755 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 756
 757 unsigned int irq_find_mapping(struct irq_host *host,
 758                               irq_hw_number_t hwirq)
 759 {
 760         unsigned int i;
 761         unsigned int hint = hwirq % irq_virq_count;
 762
 763         /* Look for default host if nececssary */
 764         if (host == NULL)
 765                 host = irq_default_host;
 766         if (host == NULL)
 767                 return NO_IRQ;
 768
 769         /* legacy -> bail early */
 770         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
 771                 return hwirq;
 772
 773         /* Slow path does a linear search of the map */
 774         if (hint < NUM_ISA_INTERRUPTS)
 775                 hint = NUM_ISA_INTERRUPTS;
 776         i = hint;
 777         do  {
 778                 if (irq_map[i].host == host &&
 779                     irq_map[i].hwirq == hwirq)
 780                         return i;
 781                 i++;
 782                 if (i >= irq_virq_count)
 783                         i = NUM_ISA_INTERRUPTS;
 784         } while(i != hint);
 785         return NO_IRQ;
 786 }
 787 EXPORT_SYMBOL_GPL(irq_find_mapping);
 788
 789
 790 unsigned int irq_radix_revmap(struct irq_host *host,
 791                               irq_hw_number_t hwirq)
 792 {
 793         struct radix_tree_root *tree;
 794         struct irq_map_entry *ptr;
 795         unsigned int virq;
 796         unsigned long flags;
 797
 798         WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
 799
 800         /* Check if the radix tree exist yet. We test the value of
 801          * the gfp_mask for that. Sneaky but saves another int in the
 802          * structure. If not, we fallback to slow mode
 803          */
 804         tree = &host->revmap_data.tree;
 805         if (tree->gfp_mask == 0)
 806                 return irq_find_mapping(host, hwirq);
 807
 808         /* Now try to resolve */
 809         irq_radix_rdlock(&flags);
 810         ptr = radix_tree_lookup(tree, hwirq);
 811         irq_radix_rdunlock(flags);
 812
 813         /* Found it, return */
 814         if (ptr) {
 815                 virq = ptr - irq_map;
 816                 return virq;
 817         }
 818
 819         /* If not there, try to insert it */
 820         virq = irq_find_mapping(host, hwirq);
 821         if (virq != NO_IRQ) {
 822                 irq_radix_wrlock(&flags);
 823                 radix_tree_insert(tree, hwirq, &irq_map[virq]);
 824                 irq_radix_wrunlock(flags);
 825         }
 826         return virq;
 827 }
 828
 829 unsigned int irq_linear_revmap(struct irq_host *host,
 830                                irq_hw_number_t hwirq)
 831 {
 832         unsigned int *revmap;
 833
 834         WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
 835
 836         /* Check revmap bounds */
 837         if (unlikely(hwirq >= host->revmap_data.linear.size))
 838                 return irq_find_mapping(host, hwirq);
 839
 840         /* Check if revmap was allocated */
 841         revmap = host->revmap_data.linear.revmap;
 842         if (unlikely(revmap == NULL))
 843                 return irq_find_mapping(host, hwirq);
 844
 845         /* Fill up revmap with slow path if no mapping found */
 846         if (unlikely(revmap[hwirq] == NO_IRQ))
 847                 revmap[hwirq] = irq_find_mapping(host, hwirq);
 848
 849         return revmap[hwirq];
 850 }
 851
 852 unsigned int irq_alloc_virt(struct irq_host *host,
 853                             unsigned int count,
 854                             unsigned int hint)
 855 {
 856         unsigned long flags;
 857         unsigned int i, j, found = NO_IRQ;
 858
 859         if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
 860                 return NO_IRQ;
 861
 862         spin_lock_irqsave(&irq_big_lock, flags);
 863
 864         /* Use hint for 1 interrupt if any */
 865         if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
 866             hint < irq_virq_count && irq_map[hint].host == NULL) {
 867                 found = hint;
 868                 goto hint_found;
 869         }
 870
 871         /* Look for count consecutive numbers in the allocatable
 872          * (non-legacy) space
 873          */
 874         for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
 875                 if (irq_map[i].host != NULL)
 876                         j = 0;
 877                 else
 878                         j++;
 879
 880                 if (j == count) {
 881                         found = i - count + 1;
 882                         break;
 883                 }
 884         }
 885         if (found == NO_IRQ) {
 886                 spin_unlock_irqrestore(&irq_big_lock, flags);
 887                 return NO_IRQ;
 888         }
 889  hint_found:
 890         for (i = found; i < (found + count); i++) {
 891                 irq_map[i].hwirq = host->inval_irq;
 892                 smp_wmb();
 893                 irq_map[i].host = host;
 894         }
 895         spin_unlock_irqrestore(&irq_big_lock, flags);
 896         return found;
 897 }
 898
 899 void irq_free_virt(unsigned int virq, unsigned int count)
 900 {
 901         unsigned long flags;
 902         unsigned int i;
 903
 904         WARN_ON (virq < NUM_ISA_INTERRUPTS);
 905         WARN_ON (count == 0 || (virq + count) > irq_virq_count);
 906
 907         spin_lock_irqsave(&irq_big_lock, flags);
 908         for (i = virq; i < (virq + count); i++) {
 909                 struct irq_host *host;
 910
 911                 if (i < NUM_ISA_INTERRUPTS ||
 912                     (virq + count) > irq_virq_count)
 913                         continue;
 914
 915                 host = irq_map[i].host;
 916                 irq_map[i].hwirq = host->inval_irq;
 917                 smp_wmb();
 918                 irq_map[i].host = NULL;
 919         }
 920         spin_unlock_irqrestore(&irq_big_lock, flags);
 921 }
 922
 923 void irq_early_init(void)
 924 {
 925         unsigned int i;
 926
 927         for (i = 0; i < NR_IRQS; i++)
 928                 get_irq_desc(i)->status |= IRQ_NOREQUEST;
 929 }
 930
 931 /* We need to create the radix trees late */
 932 static int irq_late_init(void)
 933 {
 934         struct irq_host *h;
 935         unsigned long flags;
 936
 937         irq_radix_wrlock(&flags);
 938         list_for_each_entry(h, &irq_hosts, link) {
 939                 if (h->revmap_type == IRQ_HOST_MAP_TREE)
 940                         INIT_RADIX_TREE(&h->revmap_data.tree, GFP_ATOMIC);
 941         }
 942         irq_radix_wrunlock(flags);
 943
 944         return 0;
 945 }
 946 arch_initcall(irq_late_init);
 947
 948 #endif /* CONFIG_PPC_MERGE */
 949
 950 #ifdef CONFIG_PCI_MSI
 951 int pci_enable_msi(struct pci_dev * pdev)
 952 {
 953         if (ppc_md.enable_msi)
 954                 return ppc_md.enable_msi(pdev);
 955         else
 956                 return -1;
 957 }
 958 EXPORT_SYMBOL(pci_enable_msi);
 959
 960 void pci_disable_msi(struct pci_dev * pdev)
 961 {
 962         if (ppc_md.disable_msi)
 963                 ppc_md.disable_msi(pdev);
 964 }
 965 EXPORT_SYMBOL(pci_disable_msi);
 966
 967 void pci_scan_msi_device(struct pci_dev *dev) {}
 968 int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;}
 969 void pci_disable_msix(struct pci_dev *dev) {}
 970 void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
 971 void disable_msi_mode(struct pci_dev *dev, int pos, int type) {}
 972 void pci_no_msi(void) {}
 973 EXPORT_SYMBOL(pci_enable_msix);
 974 EXPORT_SYMBOL(pci_disable_msix);
 975
 976 #endif
 977
 978 #ifdef CONFIG_PPC64
 979 static int __init setup_noirqdistrib(char *str)
 980 {
 981         distribute_irqs = 0;
 982         return 1;
 983 }
 984
 985 __setup("noirqdistrib", setup_noirqdistrib);
 986 #endif /* CONFIG_PPC64 */