Merge branch 'merge'
[linux-2.6.git] / arch / powerpc / kernel / irq.c
1 /*
2  *  Derived from arch/i386/kernel/irq.c
3  *    Copyright (C) 1992 Linus Torvalds
4  *  Adapted from arch/i386 by Gary Thomas
5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6  *  Updated and modified by Cort Dougan <cort@fsmlabs.com>
7  *    Copyright (C) 1996-2001 Cort Dougan
8  *  Adapted for Power Macintosh by Paul Mackerras
9  *    Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
10  *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public License
14  * as published by the Free Software Foundation; either version
15  * 2 of the License, or (at your option) any later version.
16  *
17  * This file contains the code used by various IRQ handling routines:
18  * asking for different IRQ's should be done through these routines
19  * instead of just grabbing them. Thus setups with different IRQ numbers
20  * shouldn't result in any weird surprises, and installing new handlers
21  * should be easier.
22  *
23  * The MPC8xx has an interrupt mask in the SIU.  If a bit is set, the
24  * interrupt is _enabled_.  As expected, IRQ0 is bit 0 in the 32-bit
25  * mask register (of which only 16 are defined), hence the weird shifting
26  * and complement of the cached_irq_mask.  I want to be able to stuff
27  * this right into the SIU SMASK register.
28  * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
29  * to reduce code space and undefined function references.
30  */
31
32 #undef DEBUG
33
34 #include <linux/module.h>
35 #include <linux/threads.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/signal.h>
38 #include <linux/sched.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/interrupt.h>
42 #include <linux/timex.h>
43 #include <linux/init.h>
44 #include <linux/slab.h>
45 #include <linux/delay.h>
46 #include <linux/irq.h>
47 #include <linux/seq_file.h>
48 #include <linux/cpumask.h>
49 #include <linux/profile.h>
50 #include <linux/bitops.h>
51 #include <linux/list.h>
52 #include <linux/radix-tree.h>
53 #include <linux/mutex.h>
54 #include <linux/bootmem.h>
55 #include <linux/pci.h>
56
57 #include <asm/uaccess.h>
58 #include <asm/system.h>
59 #include <asm/io.h>
60 #include <asm/pgtable.h>
61 #include <asm/irq.h>
62 #include <asm/cache.h>
63 #include <asm/prom.h>
64 #include <asm/ptrace.h>
65 #include <asm/machdep.h>
66 #include <asm/udbg.h>
67 #ifdef CONFIG_PPC_ISERIES
68 #include <asm/paca.h>
69 #endif
70
71 int __irq_offset_value;
72 static int ppc_spurious_interrupts;
73
74 #ifdef CONFIG_PPC32
75 EXPORT_SYMBOL(__irq_offset_value);
76 atomic_t ppc_n_lost_interrupts;
77
78 #ifndef CONFIG_PPC_MERGE
79 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
80 unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
81 #endif
82
83 #ifdef CONFIG_TAU_INT
84 extern int tau_initialized;
85 extern int tau_interrupts(int);
86 #endif
87 #endif /* CONFIG_PPC32 */
88
89 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
90 extern atomic_t ipi_recv;
91 extern atomic_t ipi_sent;
92 #endif
93
94 #ifdef CONFIG_PPC64
95 EXPORT_SYMBOL(irq_desc);
96
97 int distribute_irqs = 1;
98 #endif /* CONFIG_PPC64 */
99
100 int show_interrupts(struct seq_file *p, void *v)
101 {
102         int i = *(loff_t *)v, j;
103         struct irqaction *action;
104         irq_desc_t *desc;
105         unsigned long flags;
106
107         if (i == 0) {
108                 seq_puts(p, "           ");
109                 for_each_online_cpu(j)
110                         seq_printf(p, "CPU%d       ", j);
111                 seq_putc(p, '\n');
112         }
113
114         if (i < NR_IRQS) {
115                 desc = get_irq_desc(i);
116                 spin_lock_irqsave(&desc->lock, flags);
117                 action = desc->action;
118                 if (!action || !action->handler)
119                         goto skip;
120                 seq_printf(p, "%3d: ", i);
121 #ifdef CONFIG_SMP
122                 for_each_online_cpu(j)
123                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
124 #else
125                 seq_printf(p, "%10u ", kstat_irqs(i));
126 #endif /* CONFIG_SMP */
127                 if (desc->chip)
128                         seq_printf(p, " %s ", desc->chip->typename);
129                 else
130                         seq_puts(p, "  None      ");
131                 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge  ");
132                 seq_printf(p, "    %s", action->name);
133                 for (action = action->next; action; action = action->next)
134                         seq_printf(p, ", %s", action->name);
135                 seq_putc(p, '\n');
136 skip:
137                 spin_unlock_irqrestore(&desc->lock, flags);
138         } else if (i == NR_IRQS) {
139 #ifdef CONFIG_PPC32
140 #ifdef CONFIG_TAU_INT
141                 if (tau_initialized){
142                         seq_puts(p, "TAU: ");
143                         for_each_online_cpu(j)
144                                 seq_printf(p, "%10u ", tau_interrupts(j));
145                         seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
146                 }
147 #endif
148 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
149                 /* should this be per processor send/receive? */
150                 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
151                                 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
152 #endif
153 #endif /* CONFIG_PPC32 */
154                 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
155         }
156         return 0;
157 }
158
159 #ifdef CONFIG_HOTPLUG_CPU
160 void fixup_irqs(cpumask_t map)
161 {
162         unsigned int irq;
163         static int warned;
164
165         for_each_irq(irq) {
166                 cpumask_t mask;
167
168                 if (irq_desc[irq].status & IRQ_PER_CPU)
169                         continue;
170
171                 cpus_and(mask, irq_desc[irq].affinity, map);
172                 if (any_online_cpu(mask) == NR_CPUS) {
173                         printk("Breaking affinity for irq %i\n", irq);
174                         mask = map;
175                 }
176                 if (irq_desc[irq].chip->set_affinity)
177                         irq_desc[irq].chip->set_affinity(irq, mask);
178                 else if (irq_desc[irq].action && !(warned++))
179                         printk("Cannot set affinity for irq %i\n", irq);
180         }
181
182         local_irq_enable();
183         mdelay(1);
184         local_irq_disable();
185 }
186 #endif
187
188 void do_IRQ(struct pt_regs *regs)
189 {
190         unsigned int irq;
191 #ifdef CONFIG_IRQSTACKS
192         struct thread_info *curtp, *irqtp;
193 #endif
194
195         irq_enter();
196
197 #ifdef CONFIG_DEBUG_STACKOVERFLOW
198         /* Debugging check for stack overflow: is there less than 2KB free? */
199         {
200                 long sp;
201
202                 sp = __get_SP() & (THREAD_SIZE-1);
203
204                 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
205                         printk("do_IRQ: stack overflow: %ld\n",
206                                 sp - sizeof(struct thread_info));
207                         dump_stack();
208                 }
209         }
210 #endif
211
212         /*
213          * Every platform is required to implement ppc_md.get_irq.
214          * This function will either return an irq number or -1 to
215          * indicate there are no more pending.
216          * The value -2 is for buggy hardware and means that this IRQ
217          * has already been handled. -- Tom
218          */
219         irq = ppc_md.get_irq(regs);
220
221         if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
222 #ifdef CONFIG_IRQSTACKS
223                 /* Switch to the irq stack to handle this */
224                 curtp = current_thread_info();
225                 irqtp = hardirq_ctx[smp_processor_id()];
226                 if (curtp != irqtp) {
227                         struct irq_desc *desc = irq_desc + irq;
228                         void *handler = desc->handle_irq;
229                         if (handler == NULL)
230                                 handler = &__do_IRQ;
231                         irqtp->task = curtp->task;
232                         irqtp->flags = 0;
233                         call_handle_irq(irq, desc, regs, irqtp, handler);
234                         irqtp->task = NULL;
235                         if (irqtp->flags)
236                                 set_bits(irqtp->flags, &curtp->flags);
237                 } else
238 #endif
239                         generic_handle_irq(irq, regs);
240         } else if (irq != NO_IRQ_IGNORE)
241                 /* That's not SMP safe ... but who cares ? */
242                 ppc_spurious_interrupts++;
243
244         irq_exit();
245
246 #ifdef CONFIG_PPC_ISERIES
247         if (get_lppaca()->int_dword.fields.decr_int) {
248                 get_lppaca()->int_dword.fields.decr_int = 0;
249                 /* Signal a fake decrementer interrupt */
250                 timer_interrupt(regs);
251         }
252 #endif
253 }
254
255 void __init init_IRQ(void)
256 {
257         ppc_md.init_IRQ();
258 #ifdef CONFIG_PPC64
259         irq_ctx_init();
260 #endif
261 }
262
263
264 #ifdef CONFIG_IRQSTACKS
265 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
266 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
267
268 void irq_ctx_init(void)
269 {
270         struct thread_info *tp;
271         int i;
272
273         for_each_possible_cpu(i) {
274                 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
275                 tp = softirq_ctx[i];
276                 tp->cpu = i;
277                 tp->preempt_count = SOFTIRQ_OFFSET;
278
279                 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
280                 tp = hardirq_ctx[i];
281                 tp->cpu = i;
282                 tp->preempt_count = HARDIRQ_OFFSET;
283         }
284 }
285
286 static inline void do_softirq_onstack(void)
287 {
288         struct thread_info *curtp, *irqtp;
289
290         curtp = current_thread_info();
291         irqtp = softirq_ctx[smp_processor_id()];
292         irqtp->task = curtp->task;
293         call_do_softirq(irqtp);
294         irqtp->task = NULL;
295 }
296
297 #else
298 #define do_softirq_onstack()    __do_softirq()
299 #endif /* CONFIG_IRQSTACKS */
300
301 void do_softirq(void)
302 {
303         unsigned long flags;
304
305         if (in_interrupt())
306                 return;
307
308         local_irq_save(flags);
309
310         if (local_softirq_pending())
311                 do_softirq_onstack();
312
313         local_irq_restore(flags);
314 }
315 EXPORT_SYMBOL(do_softirq);
316
317
318 /*
319  * IRQ controller and virtual interrupts
320  */
321
322 #ifdef CONFIG_PPC_MERGE
323
324 static LIST_HEAD(irq_hosts);
325 static spinlock_t irq_big_lock = SPIN_LOCK_UNLOCKED;
326 static DEFINE_PER_CPU(unsigned int, irq_radix_reader);
327 static unsigned int irq_radix_writer;
328 struct irq_map_entry irq_map[NR_IRQS];
329 static unsigned int irq_virq_count = NR_IRQS;
330 static struct irq_host *irq_default_host;
331
332 struct irq_host *irq_alloc_host(unsigned int revmap_type,
333                                 unsigned int revmap_arg,
334                                 struct irq_host_ops *ops,
335                                 irq_hw_number_t inval_irq)
336 {
337         struct irq_host *host;
338         unsigned int size = sizeof(struct irq_host);
339         unsigned int i;
340         unsigned int *rmap;
341         unsigned long flags;
342
343         /* Allocate structure and revmap table if using linear mapping */
344         if (revmap_type == IRQ_HOST_MAP_LINEAR)
345                 size += revmap_arg * sizeof(unsigned int);
346         if (mem_init_done)
347                 host = kzalloc(size, GFP_KERNEL);
348         else {
349                 host = alloc_bootmem(size);
350                 if (host)
351                         memset(host, 0, size);
352         }
353         if (host == NULL)
354                 return NULL;
355
356         /* Fill structure */
357         host->revmap_type = revmap_type;
358         host->inval_irq = inval_irq;
359         host->ops = ops;
360
361         spin_lock_irqsave(&irq_big_lock, flags);
362
363         /* If it's a legacy controller, check for duplicates and
364          * mark it as allocated (we use irq 0 host pointer for that
365          */
366         if (revmap_type == IRQ_HOST_MAP_LEGACY) {
367                 if (irq_map[0].host != NULL) {
368                         spin_unlock_irqrestore(&irq_big_lock, flags);
369                         /* If we are early boot, we can't free the structure,
370                          * too bad...
371                          * this will be fixed once slab is made available early
372                          * instead of the current cruft
373                          */
374                         if (mem_init_done)
375                                 kfree(host);
376                         return NULL;
377                 }
378                 irq_map[0].host = host;
379         }
380
381         list_add(&host->link, &irq_hosts);
382         spin_unlock_irqrestore(&irq_big_lock, flags);
383
384         /* Additional setups per revmap type */
385         switch(revmap_type) {
386         case IRQ_HOST_MAP_LEGACY:
387                 /* 0 is always the invalid number for legacy */
388                 host->inval_irq = 0;
389                 /* setup us as the host for all legacy interrupts */
390                 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
391                         irq_map[i].hwirq = 0;
392                         smp_wmb();
393                         irq_map[i].host = host;
394                         smp_wmb();
395
396                         /* Clear norequest flags */
397                         get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
398
399                         /* Legacy flags are left to default at this point,
400                          * one can then use irq_create_mapping() to
401                          * explicitely change them
402                          */
403                         ops->map(host, i, i);
404                 }
405                 break;
406         case IRQ_HOST_MAP_LINEAR:
407                 rmap = (unsigned int *)(host + 1);
408                 for (i = 0; i < revmap_arg; i++)
409                         rmap[i] = IRQ_NONE;
410                 host->revmap_data.linear.size = revmap_arg;
411                 smp_wmb();
412                 host->revmap_data.linear.revmap = rmap;
413                 break;
414         default:
415                 break;
416         }
417
418         pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
419
420         return host;
421 }
422
423 struct irq_host *irq_find_host(struct device_node *node)
424 {
425         struct irq_host *h, *found = NULL;
426         unsigned long flags;
427
428         /* We might want to match the legacy controller last since
429          * it might potentially be set to match all interrupts in
430          * the absence of a device node. This isn't a problem so far
431          * yet though...
432          */
433         spin_lock_irqsave(&irq_big_lock, flags);
434         list_for_each_entry(h, &irq_hosts, link)
435                 if (h->ops->match == NULL || h->ops->match(h, node)) {
436                         found = h;
437                         break;
438                 }
439         spin_unlock_irqrestore(&irq_big_lock, flags);
440         return found;
441 }
442 EXPORT_SYMBOL_GPL(irq_find_host);
443
444 void irq_set_default_host(struct irq_host *host)
445 {
446         pr_debug("irq: Default host set to @0x%p\n", host);
447
448         irq_default_host = host;
449 }
450
451 void irq_set_virq_count(unsigned int count)
452 {
453         pr_debug("irq: Trying to set virq count to %d\n", count);
454
455         BUG_ON(count < NUM_ISA_INTERRUPTS);
456         if (count < NR_IRQS)
457                 irq_virq_count = count;
458 }
459
460 /* radix tree not lockless safe ! we use a brlock-type mecanism
461  * for now, until we can use a lockless radix tree
462  */
463 static void irq_radix_wrlock(unsigned long *flags)
464 {
465         unsigned int cpu, ok;
466
467         spin_lock_irqsave(&irq_big_lock, *flags);
468         irq_radix_writer = 1;
469         smp_mb();
470         do {
471                 barrier();
472                 ok = 1;
473                 for_each_possible_cpu(cpu) {
474                         if (per_cpu(irq_radix_reader, cpu)) {
475                                 ok = 0;
476                                 break;
477                         }
478                 }
479                 if (!ok)
480                         cpu_relax();
481         } while(!ok);
482 }
483
484 static void irq_radix_wrunlock(unsigned long flags)
485 {
486         smp_wmb();
487         irq_radix_writer = 0;
488         spin_unlock_irqrestore(&irq_big_lock, flags);
489 }
490
491 static void irq_radix_rdlock(unsigned long *flags)
492 {
493         local_irq_save(*flags);
494         __get_cpu_var(irq_radix_reader) = 1;
495         smp_mb();
496         if (likely(irq_radix_writer == 0))
497                 return;
498         __get_cpu_var(irq_radix_reader) = 0;
499         smp_wmb();
500         spin_lock(&irq_big_lock);
501         __get_cpu_var(irq_radix_reader) = 1;
502         spin_unlock(&irq_big_lock);
503 }
504
505 static void irq_radix_rdunlock(unsigned long flags)
506 {
507         __get_cpu_var(irq_radix_reader) = 0;
508         local_irq_restore(flags);
509 }
510
511
512 unsigned int irq_create_mapping(struct irq_host *host,
513                                 irq_hw_number_t hwirq)
514 {
515         unsigned int virq, hint;
516
517         pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
518
519         /* Look for default host if nececssary */
520         if (host == NULL)
521                 host = irq_default_host;
522         if (host == NULL) {
523                 printk(KERN_WARNING "irq_create_mapping called for"
524                        " NULL host, hwirq=%lx\n", hwirq);
525                 WARN_ON(1);
526                 return NO_IRQ;
527         }
528         pr_debug("irq: -> using host @%p\n", host);
529
530         /* Check if mapping already exist, if it does, call
531          * host->ops->map() to update the flags
532          */
533         virq = irq_find_mapping(host, hwirq);
534         if (virq != IRQ_NONE) {
535                 pr_debug("irq: -> existing mapping on virq %d\n", virq);
536                 return virq;
537         }
538
539         /* Get a virtual interrupt number */
540         if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
541                 /* Handle legacy */
542                 virq = (unsigned int)hwirq;
543                 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
544                         return NO_IRQ;
545                 return virq;
546         } else {
547                 /* Allocate a virtual interrupt number */
548                 hint = hwirq % irq_virq_count;
549                 virq = irq_alloc_virt(host, 1, hint);
550                 if (virq == NO_IRQ) {
551                         pr_debug("irq: -> virq allocation failed\n");
552                         return NO_IRQ;
553                 }
554         }
555         pr_debug("irq: -> obtained virq %d\n", virq);
556
557         /* Clear IRQ_NOREQUEST flag */
558         get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
559
560         /* map it */
561         smp_wmb();
562         irq_map[virq].hwirq = hwirq;
563         smp_mb();
564         if (host->ops->map(host, virq, hwirq)) {
565                 pr_debug("irq: -> mapping failed, freeing\n");
566                 irq_free_virt(virq, 1);
567                 return NO_IRQ;
568         }
569         return virq;
570 }
571 EXPORT_SYMBOL_GPL(irq_create_mapping);
572
573 extern unsigned int irq_create_of_mapping(struct device_node *controller,
574                                           u32 *intspec, unsigned int intsize)
575 {
576         struct irq_host *host;
577         irq_hw_number_t hwirq;
578         unsigned int type = IRQ_TYPE_NONE;
579         unsigned int virq;
580
581         if (controller == NULL)
582                 host = irq_default_host;
583         else
584                 host = irq_find_host(controller);
585         if (host == NULL) {
586                 printk(KERN_WARNING "irq: no irq host found for %s !\n",
587                        controller->full_name);
588                 return NO_IRQ;
589         }
590
591         /* If host has no translation, then we assume interrupt line */
592         if (host->ops->xlate == NULL)
593                 hwirq = intspec[0];
594         else {
595                 if (host->ops->xlate(host, controller, intspec, intsize,
596                                      &hwirq, &type))
597                         return NO_IRQ;
598         }
599
600         /* Create mapping */
601         virq = irq_create_mapping(host, hwirq);
602         if (virq == NO_IRQ)
603                 return virq;
604
605         /* Set type if specified and different than the current one */
606         if (type != IRQ_TYPE_NONE &&
607             type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
608                 set_irq_type(virq, type);
609         return virq;
610 }
611 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
612
613 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
614 {
615         struct of_irq oirq;
616
617         if (of_irq_map_one(dev, index, &oirq))
618                 return NO_IRQ;
619
620         return irq_create_of_mapping(oirq.controller, oirq.specifier,
621                                      oirq.size);
622 }
623 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
624
625 void irq_dispose_mapping(unsigned int virq)
626 {
627         struct irq_host *host = irq_map[virq].host;
628         irq_hw_number_t hwirq;
629         unsigned long flags;
630
631         WARN_ON (host == NULL);
632         if (host == NULL)
633                 return;
634
635         /* Never unmap legacy interrupts */
636         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
637                 return;
638
639         /* remove chip and handler */
640         set_irq_chip_and_handler(virq, NULL, NULL);
641
642         /* Make sure it's completed */
643         synchronize_irq(virq);
644
645         /* Tell the PIC about it */
646         if (host->ops->unmap)
647                 host->ops->unmap(host, virq);
648         smp_mb();
649
650         /* Clear reverse map */
651         hwirq = irq_map[virq].hwirq;
652         switch(host->revmap_type) {
653         case IRQ_HOST_MAP_LINEAR:
654                 if (hwirq < host->revmap_data.linear.size)
655                         host->revmap_data.linear.revmap[hwirq] = IRQ_NONE;
656                 break;
657         case IRQ_HOST_MAP_TREE:
658                 /* Check if radix tree allocated yet */
659                 if (host->revmap_data.tree.gfp_mask == 0)
660                         break;
661                 irq_radix_wrlock(&flags);
662                 radix_tree_delete(&host->revmap_data.tree, hwirq);
663                 irq_radix_wrunlock(flags);
664                 break;
665         }
666
667         /* Destroy map */
668         smp_mb();
669         irq_map[virq].hwirq = host->inval_irq;
670
671         /* Set some flags */
672         get_irq_desc(virq)->status |= IRQ_NOREQUEST;
673
674         /* Free it */
675         irq_free_virt(virq, 1);
676 }
677 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
678
679 unsigned int irq_find_mapping(struct irq_host *host,
680                               irq_hw_number_t hwirq)
681 {
682         unsigned int i;
683         unsigned int hint = hwirq % irq_virq_count;
684
685         /* Look for default host if nececssary */
686         if (host == NULL)
687                 host = irq_default_host;
688         if (host == NULL)
689                 return NO_IRQ;
690
691         /* legacy -> bail early */
692         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
693                 return hwirq;
694
695         /* Slow path does a linear search of the map */
696         if (hint < NUM_ISA_INTERRUPTS)
697                 hint = NUM_ISA_INTERRUPTS;
698         i = hint;
699         do  {
700                 if (irq_map[i].host == host &&
701                     irq_map[i].hwirq == hwirq)
702                         return i;
703                 i++;
704                 if (i >= irq_virq_count)
705                         i = NUM_ISA_INTERRUPTS;
706         } while(i != hint);
707         return NO_IRQ;
708 }
709 EXPORT_SYMBOL_GPL(irq_find_mapping);
710
711
712 unsigned int irq_radix_revmap(struct irq_host *host,
713                               irq_hw_number_t hwirq)
714 {
715         struct radix_tree_root *tree;
716         struct irq_map_entry *ptr;
717         unsigned int virq;
718         unsigned long flags;
719
720         WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
721
722         /* Check if the radix tree exist yet. We test the value of
723          * the gfp_mask for that. Sneaky but saves another int in the
724          * structure. If not, we fallback to slow mode
725          */
726         tree = &host->revmap_data.tree;
727         if (tree->gfp_mask == 0)
728                 return irq_find_mapping(host, hwirq);
729
730         /* Now try to resolve */
731         irq_radix_rdlock(&flags);
732         ptr = radix_tree_lookup(tree, hwirq);
733         irq_radix_rdunlock(flags);
734
735         /* Found it, return */
736         if (ptr) {
737                 virq = ptr - irq_map;
738                 return virq;
739         }
740
741         /* If not there, try to insert it */
742         virq = irq_find_mapping(host, hwirq);
743         if (virq != NO_IRQ) {
744                 irq_radix_wrlock(&flags);
745                 radix_tree_insert(tree, hwirq, &irq_map[virq]);
746                 irq_radix_wrunlock(flags);
747         }
748         return virq;
749 }
750
751 unsigned int irq_linear_revmap(struct irq_host *host,
752                                irq_hw_number_t hwirq)
753 {
754         unsigned int *revmap;
755
756         WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
757
758         /* Check revmap bounds */
759         if (unlikely(hwirq >= host->revmap_data.linear.size))
760                 return irq_find_mapping(host, hwirq);
761
762         /* Check if revmap was allocated */
763         revmap = host->revmap_data.linear.revmap;
764         if (unlikely(revmap == NULL))
765                 return irq_find_mapping(host, hwirq);
766
767         /* Fill up revmap with slow path if no mapping found */
768         if (unlikely(revmap[hwirq] == NO_IRQ))
769                 revmap[hwirq] = irq_find_mapping(host, hwirq);
770
771         return revmap[hwirq];
772 }
773
774 unsigned int irq_alloc_virt(struct irq_host *host,
775                             unsigned int count,
776                             unsigned int hint)
777 {
778         unsigned long flags;
779         unsigned int i, j, found = NO_IRQ;
780         unsigned int limit = irq_virq_count - count;
781
782         if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
783                 return NO_IRQ;
784
785         spin_lock_irqsave(&irq_big_lock, flags);
786
787         /* Use hint for 1 interrupt if any */
788         if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
789             hint < irq_virq_count && irq_map[hint].host == NULL) {
790                 found = hint;
791                 goto hint_found;
792         }
793
794         /* Look for count consecutive numbers in the allocatable
795          * (non-legacy) space
796          */
797         for (i = NUM_ISA_INTERRUPTS; i <= limit; ) {
798                 for (j = i; j < (i + count); j++)
799                         if (irq_map[j].host != NULL) {
800                                 i = j + 1;
801                                 continue;
802                         }
803                 found = i;
804                 break;
805         }
806         if (found == NO_IRQ) {
807                 spin_unlock_irqrestore(&irq_big_lock, flags);
808                 return NO_IRQ;
809         }
810  hint_found:
811         for (i = found; i < (found + count); i++) {
812                 irq_map[i].hwirq = host->inval_irq;
813                 smp_wmb();
814                 irq_map[i].host = host;
815         }
816         spin_unlock_irqrestore(&irq_big_lock, flags);
817         return found;
818 }
819
820 void irq_free_virt(unsigned int virq, unsigned int count)
821 {
822         unsigned long flags;
823         unsigned int i;
824
825         WARN_ON (virq < NUM_ISA_INTERRUPTS);
826         WARN_ON (count == 0 || (virq + count) > irq_virq_count);
827
828         spin_lock_irqsave(&irq_big_lock, flags);
829         for (i = virq; i < (virq + count); i++) {
830                 struct irq_host *host;
831
832                 if (i < NUM_ISA_INTERRUPTS ||
833                     (virq + count) > irq_virq_count)
834                         continue;
835
836                 host = irq_map[i].host;
837                 irq_map[i].hwirq = host->inval_irq;
838                 smp_wmb();
839                 irq_map[i].host = NULL;
840         }
841         spin_unlock_irqrestore(&irq_big_lock, flags);
842 }
843
844 void irq_early_init(void)
845 {
846         unsigned int i;
847
848         for (i = 0; i < NR_IRQS; i++)
849                 get_irq_desc(i)->status |= IRQ_NOREQUEST;
850 }
851
852 /* We need to create the radix trees late */
853 static int irq_late_init(void)
854 {
855         struct irq_host *h;
856         unsigned long flags;
857
858         irq_radix_wrlock(&flags);
859         list_for_each_entry(h, &irq_hosts, link) {
860                 if (h->revmap_type == IRQ_HOST_MAP_TREE)
861                         INIT_RADIX_TREE(&h->revmap_data.tree, GFP_ATOMIC);
862         }
863         irq_radix_wrunlock(flags);
864
865         return 0;
866 }
867 arch_initcall(irq_late_init);
868
869 #endif /* CONFIG_PPC_MERGE */
870
871 #ifdef CONFIG_PCI_MSI
872 int pci_enable_msi(struct pci_dev * pdev)
873 {
874         if (ppc_md.enable_msi)
875                 return ppc_md.enable_msi(pdev);
876         else
877                 return -1;
878 }
879 EXPORT_SYMBOL(pci_enable_msi);
880
881 void pci_disable_msi(struct pci_dev * pdev)
882 {
883         if (ppc_md.disable_msi)
884                 ppc_md.disable_msi(pdev);
885 }
886 EXPORT_SYMBOL(pci_disable_msi);
887
888 void pci_scan_msi_device(struct pci_dev *dev) {}
889 int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;}
890 void pci_disable_msix(struct pci_dev *dev) {}
891 void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
892 void disable_msi_mode(struct pci_dev *dev, int pos, int type) {}
893 void pci_no_msi(void) {}
894 EXPORT_SYMBOL(pci_enable_msix);
895 EXPORT_SYMBOL(pci_disable_msix);
896
897 #endif
898
899 #ifdef CONFIG_PPC64
900 static int __init setup_noirqdistrib(char *str)
901 {
902         distribute_irqs = 0;
903         return 1;
904 }
905
906 __setup("noirqdistrib", setup_noirqdistrib);
907 #endif /* CONFIG_PPC64 */