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