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 #include <linux/vs_context.h>
  57
  58 #include <asm/uaccess.h>
  59 #include <asm/system.h>
  60 #include <asm/io.h>
  61 #include <asm/pgtable.h>
  62 #include <asm/irq.h>
  63 #include <asm/cache.h>
  64 #include <asm/prom.h>
  65 #include <asm/ptrace.h>
  66 #include <asm/machdep.h>
  67 #include <asm/udbg.h>
  68 #ifdef CONFIG_PPC64
  69 #include <asm/paca.h>
  70 #include <asm/firmware.h>
  71 #endif
  72
  73 int __irq_offset_value;
  74 static int ppc_spurious_interrupts;
  75
  76 #ifdef CONFIG_PPC32
  77 EXPORT_SYMBOL(__irq_offset_value);
  78 atomic_t ppc_n_lost_interrupts;
  79
  80 #ifndef CONFIG_PPC_MERGE
  81 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
  82 unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
  83 #endif
  84
  85 #ifdef CONFIG_TAU_INT
  86 extern int tau_initialized;
  87 extern int tau_interrupts(int);
  88 #endif
  89 #endif /* CONFIG_PPC32 */
  90
  91 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
  92 extern atomic_t ipi_recv;
  93 extern atomic_t ipi_sent;
  94 #endif
  95
  96 #ifdef CONFIG_PPC64
  97 EXPORT_SYMBOL(irq_desc);
  98
  99 int distribute_irqs = 1;
 100
 101 static inline unsigned long get_hard_enabled(void)
 102 {
 103         unsigned long enabled;
 104
 105         __asm__ __volatile__("lbz %0,%1(13)"
 106         : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
 107
 108         return enabled;
 109 }
 110
 111 static inline void set_soft_enabled(unsigned long enable)
 112 {
 113         __asm__ __volatile__("stb %0,%1(13)"
 114         : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
 115 }
 116
 117 void local_irq_restore(unsigned long en)
 118 {
 119         /*
 120          * get_paca()->soft_enabled = en;
 121          * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
 122          * That was allowed before, and in such a case we do need to take care
 123          * that gcc will set soft_enabled directly via r13, not choose to use
 124          * an intermediate register, lest we're preempted to a different cpu.
 125          */
 126         set_soft_enabled(en);
 127         if (!en)
 128                 return;
 129
 130         if (firmware_has_feature(FW_FEATURE_ISERIES)) {
 131                 /*
 132                  * Do we need to disable preemption here?  Not really: in the
 133                  * unlikely event that we're preempted to a different cpu in
 134                  * between getting r13, loading its lppaca_ptr, and loading
 135                  * its any_int, we might call iseries_handle_interrupts without
 136                  * an interrupt pending on the new cpu, but that's no disaster,
 137                  * is it?  And the business of preempting us off the old cpu
 138                  * would itself involve a local_irq_restore which handles the
 139                  * interrupt to that cpu.
 140                  *
 141                  * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
 142                  * to avoid any preemption checking added into get_paca().
 143                  */
 144                 if (local_paca->lppaca_ptr->int_dword.any_int)
 145                         iseries_handle_interrupts();
 146                 return;
 147         }
 148
 149         /*
 150          * if (get_paca()->hard_enabled) return;
 151          * But again we need to take care that gcc gets hard_enabled directly
 152          * via r13, not choose to use an intermediate register, lest we're
 153          * preempted to a different cpu in between the two instructions.
 154          */
 155         if (get_hard_enabled())
 156                 return;
 157
 158         /*
 159          * Need to hard-enable interrupts here.  Since currently disabled,
 160          * no need to take further asm precautions against preemption; but
 161          * use local_paca instead of get_paca() to avoid preemption checking.
 162          */
 163         local_paca->hard_enabled = en;
 164         if ((int)mfspr(SPRN_DEC) < 0)
 165                 mtspr(SPRN_DEC, 1);
 166         hard_irq_enable();
 167 }
 168 #endif /* CONFIG_PPC64 */
 169
 170 int show_interrupts(struct seq_file *p, void *v)
 171 {
 172         int i = *(loff_t *)v, j;
 173         struct irqaction *action;
 174         irq_desc_t *desc;
 175         unsigned long flags;
 176
 177         if (i == 0) {
 178                 seq_puts(p, "           ");
 179                 for_each_online_cpu(j)
 180                         seq_printf(p, "CPU%d       ", j);
 181                 seq_putc(p, '\n');
 182         }
 183
 184         if (i < NR_IRQS) {
 185                 desc = get_irq_desc(i);
 186                 spin_lock_irqsave(&desc->lock, flags);
 187                 action = desc->action;
 188                 if (!action || !action->handler)
 189                         goto skip;
 190                 seq_printf(p, "%3d: ", i);
 191 #ifdef CONFIG_SMP
 192                 for_each_online_cpu(j)
 193                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 194 #else
 195                 seq_printf(p, "%10u ", kstat_irqs(i));
 196 #endif /* CONFIG_SMP */
 197                 if (desc->chip)
 198                         seq_printf(p, " %s ", desc->chip->typename);
 199                 else
 200                         seq_puts(p, "  None      ");
 201                 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge  ");
 202                 seq_printf(p, "    %s", action->name);
 203                 for (action = action->next; action; action = action->next)
 204                         seq_printf(p, ", %s", action->name);
 205                 seq_putc(p, '\n');
 206 skip:
 207                 spin_unlock_irqrestore(&desc->lock, flags);
 208         } else if (i == NR_IRQS) {
 209 #ifdef CONFIG_PPC32
 210 #ifdef CONFIG_TAU_INT
 211                 if (tau_initialized){
 212                         seq_puts(p, "TAU: ");
 213                         for_each_online_cpu(j)
 214                                 seq_printf(p, "%10u ", tau_interrupts(j));
 215                         seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
 216                 }
 217 #endif
 218 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
 219                 /* should this be per processor send/receive? */
 220                 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
 221                                 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
 222 #endif
 223 #endif /* CONFIG_PPC32 */
 224                 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
 225         }
 226         return 0;
 227 }
 228
 229 #ifdef CONFIG_HOTPLUG_CPU
 230 void fixup_irqs(cpumask_t map)
 231 {
 232         unsigned int irq;
 233         static int warned;
 234
 235         for_each_irq(irq) {
 236                 cpumask_t mask;
 237
 238                 if (irq_desc[irq].status & IRQ_PER_CPU)
 239                         continue;
 240
 241                 cpus_and(mask, irq_desc[irq].affinity, map);
 242                 if (any_online_cpu(mask) == NR_CPUS) {
 243                         printk("Breaking affinity for irq %i\n", irq);
 244                         mask = map;
 245                 }
 246                 if (irq_desc[irq].chip->set_affinity)
 247                         irq_desc[irq].chip->set_affinity(irq, mask);
 248                 else if (irq_desc[irq].action && !(warned++))
 249                         printk("Cannot set affinity for irq %i\n", irq);
 250         }
 251
 252         local_irq_enable();
 253         mdelay(1);
 254         local_irq_disable();
 255 }
 256 #endif
 257
 258 void do_IRQ(struct pt_regs *regs)
 259 {
 260         struct pt_regs *old_regs = set_irq_regs(regs);
 261         unsigned int irq;
 262 #ifdef CONFIG_IRQSTACKS
 263         struct thread_info *curtp, *irqtp;
 264 #endif
 265
 266         irq_enter();
 267
 268 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 269         /* Debugging check for stack overflow: is there less than 2KB free? */
 270         {
 271                 long sp;
 272
 273                 sp = __get_SP() & (THREAD_SIZE-1);
 274
 275                 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
 276                         printk("do_IRQ: stack overflow: %ld\n",
 277                                 sp - sizeof(struct thread_info));
 278                         dump_stack();
 279                 }
 280         }
 281 #endif
 282
 283         /*
 284          * Every platform is required to implement ppc_md.get_irq.
 285          * This function will either return an irq number or -1 to
 286          * indicate there are no more pending.
 287          * The value -2 is for buggy hardware and means that this IRQ
 288          * has already been handled. -- Tom
 289          */
 290         irq = ppc_md.get_irq();
 291
 292         if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
 293 #ifdef CONFIG_IRQSTACKS
 294                 /* Switch to the irq stack to handle this */
 295                 curtp = current_thread_info();
 296                 irqtp = hardirq_ctx[smp_processor_id()];
 297                 if (curtp != irqtp) {
 298                         struct irq_desc *desc = irq_desc + irq;
 299                         void *handler = desc->handle_irq;
 300                         if (handler == NULL)
 301                                 handler = &__do_IRQ;
 302                         irqtp->task = curtp->task;
 303                         irqtp->flags = 0;
 304                         call_handle_irq(irq, desc, irqtp, handler);
 305                         irqtp->task = NULL;
 306                         if (irqtp->flags)
 307                                 set_bits(irqtp->flags, &curtp->flags);
 308                 } else
 309 #endif
 310                         generic_handle_irq(irq);
 311         } else if (irq != NO_IRQ_IGNORE)
 312                 /* That's not SMP safe ... but who cares ? */
 313                 ppc_spurious_interrupts++;
 314
 315         irq_exit();
 316         set_irq_regs(old_regs);
 317
 318 #ifdef CONFIG_PPC_ISERIES
 319         if (firmware_has_feature(FW_FEATURE_ISERIES) &&
 320                         get_lppaca()->int_dword.fields.decr_int) {
 321                 get_lppaca()->int_dword.fields.decr_int = 0;
 322                 /* Signal a fake decrementer interrupt */
 323                 timer_interrupt(regs);
 324         }
 325 #endif
 326 }
 327
 328 void __init init_IRQ(void)
 329 {
 330         ppc_md.init_IRQ();
 331 #ifdef CONFIG_PPC64
 332         irq_ctx_init();
 333 #endif
 334 }
 335
 336
 337 #ifdef CONFIG_IRQSTACKS
 338 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
 339 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
 340
 341 void irq_ctx_init(void)
 342 {
 343         struct thread_info *tp;
 344         int i;
 345
 346         for_each_possible_cpu(i) {
 347                 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
 348                 tp = softirq_ctx[i];
 349                 tp->cpu = i;
 350                 tp->preempt_count = SOFTIRQ_OFFSET;
 351
 352                 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
 353                 tp = hardirq_ctx[i];
 354                 tp->cpu = i;
 355                 tp->preempt_count = HARDIRQ_OFFSET;
 356         }
 357 }
 358
 359 static inline void do_softirq_onstack(void)
 360 {
 361         struct thread_info *curtp, *irqtp;
 362
 363         curtp = current_thread_info();
 364         irqtp = softirq_ctx[smp_processor_id()];
 365         irqtp->task = curtp->task;
 366         call_do_softirq(irqtp);
 367         irqtp->task = NULL;
 368 }
 369
 370 #else
 371 #define do_softirq_onstack()    __do_softirq()
 372 #endif /* CONFIG_IRQSTACKS */
 373
 374 void do_softirq(void)
 375 {
 376         unsigned long flags;
 377
 378         if (in_interrupt())
 379                 return;
 380
 381         local_irq_save(flags);
 382
 383         if (local_softirq_pending())
 384                 do_softirq_onstack();
 385
 386         local_irq_restore(flags);
 387 }
 388 EXPORT_SYMBOL(do_softirq);
 389
 390
 391 /*
 392  * IRQ controller and virtual interrupts
 393  */
 394
 395 #ifdef CONFIG_PPC_MERGE
 396
 397 static LIST_HEAD(irq_hosts);
 398 static spinlock_t irq_big_lock = SPIN_LOCK_UNLOCKED;
 399 static DEFINE_PER_CPU(unsigned int, irq_radix_reader);
 400 static unsigned int irq_radix_writer;
 401 struct irq_map_entry irq_map[NR_IRQS];
 402 static unsigned int irq_virq_count = NR_IRQS;
 403 static struct irq_host *irq_default_host;
 404
 405 struct irq_host *irq_alloc_host(unsigned int revmap_type,
 406                                 unsigned int revmap_arg,
 407                                 struct irq_host_ops *ops,
 408                                 irq_hw_number_t inval_irq)
 409 {
 410         struct irq_host *host;
 411         unsigned int size = sizeof(struct irq_host);
 412         unsigned int i;
 413         unsigned int *rmap;
 414         unsigned long flags;
 415
 416         /* Allocate structure and revmap table if using linear mapping */
 417         if (revmap_type == IRQ_HOST_MAP_LINEAR)
 418                 size += revmap_arg * sizeof(unsigned int);
 419         if (mem_init_done)
 420                 host = kzalloc(size, GFP_KERNEL);
 421         else {
 422                 host = alloc_bootmem(size);
 423                 if (host)
 424                         memset(host, 0, size);
 425         }
 426         if (host == NULL)
 427                 return NULL;
 428
 429         /* Fill structure */
 430         host->revmap_type = revmap_type;
 431         host->inval_irq = inval_irq;
 432         host->ops = ops;
 433
 434         spin_lock_irqsave(&irq_big_lock, flags);
 435
 436         /* If it's a legacy controller, check for duplicates and
 437          * mark it as allocated (we use irq 0 host pointer for that
 438          */
 439         if (revmap_type == IRQ_HOST_MAP_LEGACY) {
 440                 if (irq_map[0].host != NULL) {
 441                         spin_unlock_irqrestore(&irq_big_lock, flags);
 442                         /* If we are early boot, we can't free the structure,
 443                          * too bad...
 444                          * this will be fixed once slab is made available early
 445                          * instead of the current cruft
 446                          */
 447                         if (mem_init_done)
 448                                 kfree(host);
 449                         return NULL;
 450                 }
 451                 irq_map[0].host = host;
 452         }
 453
 454         list_add(&host->link, &irq_hosts);
 455         spin_unlock_irqrestore(&irq_big_lock, flags);
 456
 457         /* Additional setups per revmap type */
 458         switch(revmap_type) {
 459         case IRQ_HOST_MAP_LEGACY:
 460                 /* 0 is always the invalid number for legacy */
 461                 host->inval_irq = 0;
 462                 /* setup us as the host for all legacy interrupts */
 463                 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
 464                         irq_map[i].hwirq = 0;
 465                         smp_wmb();
 466                         irq_map[i].host = host;
 467                         smp_wmb();
 468
 469                         /* Clear norequest flags */
 470                         get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
 471
 472                         /* Legacy flags are left to default at this point,
 473                          * one can then use irq_create_mapping() to
 474                          * explicitely change them
 475                          */
 476                         ops->map(host, i, i);
 477                 }
 478                 break;
 479         case IRQ_HOST_MAP_LINEAR:
 480                 rmap = (unsigned int *)(host + 1);
 481                 for (i = 0; i < revmap_arg; i++)
 482                         rmap[i] = IRQ_NONE;
 483                 host->revmap_data.linear.size = revmap_arg;
 484                 smp_wmb();
 485                 host->revmap_data.linear.revmap = rmap;
 486                 break;
 487         default:
 488                 break;
 489         }
 490
 491         pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
 492
 493         return host;
 494 }
 495
 496 struct irq_host *irq_find_host(struct device_node *node)
 497 {
 498         struct irq_host *h, *found = NULL;
 499         unsigned long flags;
 500
 501         /* We might want to match the legacy controller last since
 502          * it might potentially be set to match all interrupts in
 503          * the absence of a device node. This isn't a problem so far
 504          * yet though...
 505          */
 506         spin_lock_irqsave(&irq_big_lock, flags);
 507         list_for_each_entry(h, &irq_hosts, link)
 508                 if (h->ops->match == NULL || h->ops->match(h, node)) {
 509                         found = h;
 510                         break;
 511                 }
 512         spin_unlock_irqrestore(&irq_big_lock, flags);
 513         return found;
 514 }
 515 EXPORT_SYMBOL_GPL(irq_find_host);
 516
 517 void irq_set_default_host(struct irq_host *host)
 518 {
 519         pr_debug("irq: Default host set to @0x%p\n", host);
 520
 521         irq_default_host = host;
 522 }
 523
 524 void irq_set_virq_count(unsigned int count)
 525 {
 526         pr_debug("irq: Trying to set virq count to %d\n", count);
 527
 528         BUG_ON(count < NUM_ISA_INTERRUPTS);
 529         if (count < NR_IRQS)
 530                 irq_virq_count = count;
 531 }
 532
 533 /* radix tree not lockless safe ! we use a brlock-type mecanism
 534  * for now, until we can use a lockless radix tree
 535  */
 536 static void irq_radix_wrlock(unsigned long *flags)
 537 {
 538         unsigned int cpu, ok;
 539
 540         spin_lock_irqsave(&irq_big_lock, *flags);
 541         irq_radix_writer = 1;
 542         smp_mb();
 543         do {
 544                 barrier();
 545                 ok = 1;
 546                 for_each_possible_cpu(cpu) {
 547                         if (per_cpu(irq_radix_reader, cpu)) {
 548                                 ok = 0;
 549                                 break;
 550                         }
 551                 }
 552                 if (!ok)
 553                         cpu_relax();
 554         } while(!ok);
 555 }
 556
 557 static void irq_radix_wrunlock(unsigned long flags)
 558 {
 559         smp_wmb();
 560         irq_radix_writer = 0;
 561         spin_unlock_irqrestore(&irq_big_lock, flags);
 562 }
 563
 564 static void irq_radix_rdlock(unsigned long *flags)
 565 {
 566         local_irq_save(*flags);
 567         __get_cpu_var(irq_radix_reader) = 1;
 568         smp_mb();
 569         if (likely(irq_radix_writer == 0))
 570                 return;
 571         __get_cpu_var(irq_radix_reader) = 0;
 572         smp_wmb();
 573         spin_lock(&irq_big_lock);
 574         __get_cpu_var(irq_radix_reader) = 1;
 575         spin_unlock(&irq_big_lock);
 576 }
 577
 578 static void irq_radix_rdunlock(unsigned long flags)
 579 {
 580         __get_cpu_var(irq_radix_reader) = 0;
 581         local_irq_restore(flags);
 582 }
 583
 584
 585 unsigned int irq_create_mapping(struct irq_host *host,
 586                                 irq_hw_number_t hwirq)
 587 {
 588         unsigned int virq, hint;
 589
 590         pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
 591
 592         /* Look for default host if nececssary */
 593         if (host == NULL)
 594                 host = irq_default_host;
 595         if (host == NULL) {
 596                 printk(KERN_WARNING "irq_create_mapping called for"
 597                        " NULL host, hwirq=%lx\n", hwirq);
 598                 WARN_ON(1);
 599                 return NO_IRQ;
 600         }
 601         pr_debug("irq: -> using host @%p\n", host);
 602
 603         /* Check if mapping already exist, if it does, call
 604          * host->ops->map() to update the flags
 605          */
 606         virq = irq_find_mapping(host, hwirq);
 607         if (virq != IRQ_NONE) {
 608                 pr_debug("irq: -> existing mapping on virq %d\n", virq);
 609                 return virq;
 610         }
 611
 612         /* Get a virtual interrupt number */
 613         if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
 614                 /* Handle legacy */
 615                 virq = (unsigned int)hwirq;
 616                 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
 617                         return NO_IRQ;
 618                 return virq;
 619         } else {
 620                 /* Allocate a virtual interrupt number */
 621                 hint = hwirq % irq_virq_count;
 622                 virq = irq_alloc_virt(host, 1, hint);
 623                 if (virq == NO_IRQ) {
 624                         pr_debug("irq: -> virq allocation failed\n");
 625                         return NO_IRQ;
 626                 }
 627         }
 628         pr_debug("irq: -> obtained virq %d\n", virq);
 629
 630         /* Clear IRQ_NOREQUEST flag */
 631         get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
 632
 633         /* map it */
 634         smp_wmb();
 635         irq_map[virq].hwirq = hwirq;
 636         smp_mb();
 637         if (host->ops->map(host, virq, hwirq)) {
 638                 pr_debug("irq: -> mapping failed, freeing\n");
 639                 irq_free_virt(virq, 1);
 640                 return NO_IRQ;
 641         }
 642         return virq;
 643 }
 644 EXPORT_SYMBOL_GPL(irq_create_mapping);
 645
 646 unsigned int irq_create_of_mapping(struct device_node *controller,
 647                                    u32 *intspec, unsigned int intsize)
 648 {
 649         struct irq_host *host;
 650         irq_hw_number_t hwirq;
 651         unsigned int type = IRQ_TYPE_NONE;
 652         unsigned int virq;
 653
 654         if (controller == NULL)
 655                 host = irq_default_host;
 656         else
 657                 host = irq_find_host(controller);
 658         if (host == NULL) {
 659                 printk(KERN_WARNING "irq: no irq host found for %s !\n",
 660                        controller->full_name);
 661                 return NO_IRQ;
 662         }
 663
 664         /* If host has no translation, then we assume interrupt line */
 665         if (host->ops->xlate == NULL)
 666                 hwirq = intspec[0];
 667         else {
 668                 if (host->ops->xlate(host, controller, intspec, intsize,
 669                                      &hwirq, &type))
 670                         return NO_IRQ;
 671         }
 672
 673         /* Create mapping */
 674         virq = irq_create_mapping(host, hwirq);
 675         if (virq == NO_IRQ)
 676                 return virq;
 677
 678         /* Set type if specified and different than the current one */
 679         if (type != IRQ_TYPE_NONE &&
 680             type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
 681                 set_irq_type(virq, type);
 682         return virq;
 683 }
 684 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 685
 686 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
 687 {
 688         struct of_irq oirq;
 689
 690         if (of_irq_map_one(dev, index, &oirq))
 691                 return NO_IRQ;
 692
 693         return irq_create_of_mapping(oirq.controller, oirq.specifier,
 694                                      oirq.size);
 695 }
 696 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
 697
 698 void irq_dispose_mapping(unsigned int virq)
 699 {
 700         struct irq_host *host;
 701         irq_hw_number_t hwirq;
 702         unsigned long flags;
 703
 704         if (virq == NO_IRQ)
 705                 return;
 706
 707         host = irq_map[virq].host;
 708         WARN_ON (host == NULL);
 709         if (host == NULL)
 710                 return;
 711
 712         /* Never unmap legacy interrupts */
 713         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
 714                 return;
 715
 716         /* remove chip and handler */
 717         set_irq_chip_and_handler(virq, NULL, NULL);
 718
 719         /* Make sure it's completed */
 720         synchronize_irq(virq);
 721
 722         /* Tell the PIC about it */
 723         if (host->ops->unmap)
 724                 host->ops->unmap(host, virq);
 725         smp_mb();
 726
 727         /* Clear reverse map */
 728         hwirq = irq_map[virq].hwirq;
 729         switch(host->revmap_type) {
 730         case IRQ_HOST_MAP_LINEAR:
 731                 if (hwirq < host->revmap_data.linear.size)
 732                         host->revmap_data.linear.revmap[hwirq] = IRQ_NONE;
 733                 break;
 734         case IRQ_HOST_MAP_TREE:
 735                 /* Check if radix tree allocated yet */
 736                 if (host->revmap_data.tree.gfp_mask == 0)
 737                         break;
 738                 irq_radix_wrlock(&flags);
 739                 radix_tree_delete(&host->revmap_data.tree, hwirq);
 740                 irq_radix_wrunlock(flags);
 741                 break;
 742         }
 743
 744         /* Destroy map */
 745         smp_mb();
 746         irq_map[virq].hwirq = host->inval_irq;
 747
 748         /* Set some flags */
 749         get_irq_desc(virq)->status |= IRQ_NOREQUEST;
 750
 751         /* Free it */
 752         irq_free_virt(virq, 1);
 753 }
 754 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 755
 756 unsigned int irq_find_mapping(struct irq_host *host,
 757                               irq_hw_number_t hwirq)
 758 {
 759         unsigned int i;
 760         unsigned int hint = hwirq % irq_virq_count;
 761
 762         /* Look for default host if nececssary */
 763         if (host == NULL)
 764                 host = irq_default_host;
 765         if (host == NULL)
 766                 return NO_IRQ;
 767
 768         /* legacy -> bail early */
 769         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
 770                 return hwirq;
 771
 772         /* Slow path does a linear search of the map */
 773         if (hint < NUM_ISA_INTERRUPTS)
 774                 hint = NUM_ISA_INTERRUPTS;
 775         i = hint;
 776         do  {
 777                 if (irq_map[i].host == host &&
 778                     irq_map[i].hwirq == hwirq)
 779                         return i;
 780                 i++;
 781                 if (i >= irq_virq_count)
 782                         i = NUM_ISA_INTERRUPTS;
 783         } while(i != hint);
 784         return NO_IRQ;
 785 }
 786 EXPORT_SYMBOL_GPL(irq_find_mapping);
 787
 788
 789 unsigned int irq_radix_revmap(struct irq_host *host,
 790                               irq_hw_number_t hwirq)
 791 {
 792         struct radix_tree_root *tree;
 793         struct irq_map_entry *ptr;
 794         unsigned int virq;
 795         unsigned long flags;
 796
 797         WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
 798
 799         /* Check if the radix tree exist yet. We test the value of
 800          * the gfp_mask for that. Sneaky but saves another int in the
 801          * structure. If not, we fallback to slow mode
 802          */
 803         tree = &host->revmap_data.tree;
 804         if (tree->gfp_mask == 0)
 805                 return irq_find_mapping(host, hwirq);
 806
 807         /* Now try to resolve */
 808         irq_radix_rdlock(&flags);
 809         ptr = radix_tree_lookup(tree, hwirq);
 810         irq_radix_rdunlock(flags);
 811
 812         /* Found it, return */
 813         if (ptr) {
 814                 virq = ptr - irq_map;
 815                 return virq;
 816         }
 817
 818         /* If not there, try to insert it */
 819         virq = irq_find_mapping(host, hwirq);
 820         if (virq != NO_IRQ) {
 821                 irq_radix_wrlock(&flags);
 822                 radix_tree_insert(tree, hwirq, &irq_map[virq]);
 823                 irq_radix_wrunlock(flags);
 824         }
 825         return virq;
 826 }
 827
 828 unsigned int irq_linear_revmap(struct irq_host *host,
 829                                irq_hw_number_t hwirq)
 830 {
 831         unsigned int *revmap;
 832
 833         WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
 834
 835         /* Check revmap bounds */
 836         if (unlikely(hwirq >= host->revmap_data.linear.size))
 837                 return irq_find_mapping(host, hwirq);
 838
 839         /* Check if revmap was allocated */
 840         revmap = host->revmap_data.linear.revmap;
 841         if (unlikely(revmap == NULL))
 842                 return irq_find_mapping(host, hwirq);
 843
 844         /* Fill up revmap with slow path if no mapping found */
 845         if (unlikely(revmap[hwirq] == NO_IRQ))
 846                 revmap[hwirq] = irq_find_mapping(host, hwirq);
 847
 848         return revmap[hwirq];
 849 }
 850
 851 unsigned int irq_alloc_virt(struct irq_host *host,
 852                             unsigned int count,
 853                             unsigned int hint)
 854 {
 855         unsigned long flags;
 856         unsigned int i, j, found = NO_IRQ;
 857
 858         if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
 859                 return NO_IRQ;
 860
 861         spin_lock_irqsave(&irq_big_lock, flags);
 862
 863         /* Use hint for 1 interrupt if any */
 864         if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
 865             hint < irq_virq_count && irq_map[hint].host == NULL) {
 866                 found = hint;
 867                 goto hint_found;
 868         }
 869
 870         /* Look for count consecutive numbers in the allocatable
 871          * (non-legacy) space
 872          */
 873         for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
 874                 if (irq_map[i].host != NULL)
 875                         j = 0;
 876                 else
 877                         j++;
 878
 879                 if (j == count) {
 880                         found = i - count + 1;
 881                         break;
 882                 }
 883         }
 884         if (found == NO_IRQ) {
 885                 spin_unlock_irqrestore(&irq_big_lock, flags);
 886                 return NO_IRQ;
 887         }
 888  hint_found:
 889         for (i = found; i < (found + count); i++) {
 890                 irq_map[i].hwirq = host->inval_irq;
 891                 smp_wmb();
 892                 irq_map[i].host = host;
 893         }
 894         spin_unlock_irqrestore(&irq_big_lock, flags);
 895         return found;
 896 }
 897
 898 void irq_free_virt(unsigned int virq, unsigned int count)
 899 {
 900         unsigned long flags;
 901         unsigned int i;
 902
 903         WARN_ON (virq < NUM_ISA_INTERRUPTS);
 904         WARN_ON (count == 0 || (virq + count) > irq_virq_count);
 905
 906         spin_lock_irqsave(&irq_big_lock, flags);
 907         for (i = virq; i < (virq + count); i++) {
 908                 struct irq_host *host;
 909
 910                 if (i < NUM_ISA_INTERRUPTS ||
 911                     (virq + count) > irq_virq_count)
 912                         continue;
 913
 914                 host = irq_map[i].host;
 915                 irq_map[i].hwirq = host->inval_irq;
 916                 smp_wmb();
 917                 irq_map[i].host = NULL;
 918         }
 919         spin_unlock_irqrestore(&irq_big_lock, flags);
 920 }
 921
 922 void irq_early_init(void)
 923 {
 924         unsigned int i;
 925
 926         for (i = 0; i < NR_IRQS; i++)
 927                 get_irq_desc(i)->status |= IRQ_NOREQUEST;
 928 }
 929
 930 /* We need to create the radix trees late */
 931 static int irq_late_init(void)
 932 {
 933         struct irq_host *h;
 934         unsigned long flags;
 935
 936         irq_radix_wrlock(&flags);
 937         list_for_each_entry(h, &irq_hosts, link) {
 938                 if (h->revmap_type == IRQ_HOST_MAP_TREE)
 939                         INIT_RADIX_TREE(&h->revmap_data.tree, GFP_ATOMIC);
 940         }
 941         irq_radix_wrunlock(flags);
 942
 943         return 0;
 944 }
 945 arch_initcall(irq_late_init);
 946
 947 #endif /* CONFIG_PPC_MERGE */
 948
 949 #ifdef CONFIG_PCI_MSI
 950 int pci_enable_msi(struct pci_dev * pdev)
 951 {
 952         if (ppc_md.enable_msi)
 953                 return ppc_md.enable_msi(pdev);
 954         else
 955                 return -1;
 956 }
 957 EXPORT_SYMBOL(pci_enable_msi);
 958
 959 void pci_disable_msi(struct pci_dev * pdev)
 960 {
 961         if (ppc_md.disable_msi)
 962                 ppc_md.disable_msi(pdev);
 963 }
 964 EXPORT_SYMBOL(pci_disable_msi);
 965
 966 void pci_scan_msi_device(struct pci_dev *dev) {}
 967 int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;}
 968 void pci_disable_msix(struct pci_dev *dev) {}
 969 void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
 970 void disable_msi_mode(struct pci_dev *dev, int pos, int type) {}
 971 void pci_no_msi(void) {}
 972 EXPORT_SYMBOL(pci_enable_msix);
 973 EXPORT_SYMBOL(pci_disable_msix);
 974
 975 #endif
 976
 977 #ifdef CONFIG_PPC64
 978 static int __init setup_noirqdistrib(char *str)
 979 {
 980         distribute_irqs = 0;
 981         return 1;
 982 }
 983
 984 __setup("noirqdistrib", setup_noirqdistrib);
 985 #endif /* CONFIG_PPC64 */