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1 /* irq.c: UltraSparc IRQ handling/init/registry.
2  *
3  * Copyright (C) 1997, 2007  David S. Miller  (davem@davemloft.net)
4  * Copyright (C) 1998  Eddie C. Dost    (ecd@skynet.be)
5  * Copyright (C) 1998  Jakub Jelinek    (jj@ultra.linux.cz)
6  */
7
8 #include <linux/module.h>
9 #include <linux/sched.h>
10 #include <linux/ptrace.h>
11 #include <linux/errno.h>
12 #include <linux/kernel_stat.h>
13 #include <linux/signal.h>
14 #include <linux/mm.h>
15 #include <linux/interrupt.h>
16 #include <linux/slab.h>
17 #include <linux/random.h>
18 #include <linux/init.h>
19 #include <linux/delay.h>
20 #include <linux/proc_fs.h>
21 #include <linux/seq_file.h>
22 #include <linux/bootmem.h>
23 #include <linux/irq.h>
24
25 #include <asm/ptrace.h>
26 #include <asm/processor.h>
27 #include <asm/atomic.h>
28 #include <asm/system.h>
29 #include <asm/irq.h>
30 #include <asm/io.h>
31 #include <asm/sbus.h>
32 #include <asm/iommu.h>
33 #include <asm/upa.h>
34 #include <asm/oplib.h>
35 #include <asm/prom.h>
36 #include <asm/timer.h>
37 #include <asm/smp.h>
38 #include <asm/starfire.h>
39 #include <asm/uaccess.h>
40 #include <asm/cache.h>
41 #include <asm/cpudata.h>
42 #include <asm/auxio.h>
43 #include <asm/head.h>
44 #include <asm/hypervisor.h>
45 #include <asm/cacheflush.h>
46
47 /* UPA nodes send interrupt packet to UltraSparc with first data reg
48  * value low 5 (7 on Starfire) bits holding the IRQ identifier being
49  * delivered.  We must translate this into a non-vector IRQ so we can
50  * set the softint on this cpu.
51  *
52  * To make processing these packets efficient and race free we use
53  * an array of irq buckets below.  The interrupt vector handler in
54  * entry.S feeds incoming packets into per-cpu pil-indexed lists.
55  *
56  * If you make changes to ino_bucket, please update hand coded assembler
57  * of the vectored interrupt trap handler(s) in entry.S and sun4v_ivec.S
58  */
59 struct ino_bucket {
60 /*0x00*/unsigned long __irq_chain_pa;
61
62         /* Virtual interrupt number assigned to this INO.  */
63 /*0x08*/unsigned int __virt_irq;
64 /*0x0c*/unsigned int __pad;
65 };
66
67 #define NUM_IVECS       (IMAP_INR + 1)
68 struct ino_bucket *ivector_table;
69 unsigned long ivector_table_pa;
70
71 /* On several sun4u processors, it is illegal to mix bypass and
72  * non-bypass accesses.  Therefore we access all INO buckets
73  * using bypass accesses only.
74  */
75 static unsigned long bucket_get_chain_pa(unsigned long bucket_pa)
76 {
77         unsigned long ret;
78
79         __asm__ __volatile__("ldxa      [%1] %2, %0"
80                              : "=&r" (ret)
81                              : "r" (bucket_pa +
82                                     offsetof(struct ino_bucket,
83                                              __irq_chain_pa)),
84                                "i" (ASI_PHYS_USE_EC));
85
86         return ret;
87 }
88
89 static void bucket_clear_chain_pa(unsigned long bucket_pa)
90 {
91         __asm__ __volatile__("stxa      %%g0, [%0] %1"
92                              : /* no outputs */
93                              : "r" (bucket_pa +
94                                     offsetof(struct ino_bucket,
95                                              __irq_chain_pa)),
96                                "i" (ASI_PHYS_USE_EC));
97 }
98
99 static unsigned int bucket_get_virt_irq(unsigned long bucket_pa)
100 {
101         unsigned int ret;
102
103         __asm__ __volatile__("lduwa     [%1] %2, %0"
104                              : "=&r" (ret)
105                              : "r" (bucket_pa +
106                                     offsetof(struct ino_bucket,
107                                              __virt_irq)),
108                                "i" (ASI_PHYS_USE_EC));
109
110         return ret;
111 }
112
113 static void bucket_set_virt_irq(unsigned long bucket_pa,
114                                 unsigned int virt_irq)
115 {
116         __asm__ __volatile__("stwa      %0, [%1] %2"
117                              : /* no outputs */
118                              : "r" (virt_irq),
119                                "r" (bucket_pa +
120                                     offsetof(struct ino_bucket,
121                                              __virt_irq)),
122                                "i" (ASI_PHYS_USE_EC));
123 }
124
125 #define irq_work_pa(__cpu)      &(trap_block[(__cpu)].irq_worklist_pa)
126
127 static struct {
128         unsigned int dev_handle;
129         unsigned int dev_ino;
130         unsigned int in_use;
131 } virt_irq_table[NR_IRQS];
132 static DEFINE_SPINLOCK(virt_irq_alloc_lock);
133
134 unsigned char virt_irq_alloc(unsigned int dev_handle,
135                              unsigned int dev_ino)
136 {
137         unsigned long flags;
138         unsigned char ent;
139
140         BUILD_BUG_ON(NR_IRQS >= 256);
141
142         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
143
144         for (ent = 1; ent < NR_IRQS; ent++) {
145                 if (!virt_irq_table[ent].in_use)
146                         break;
147         }
148         if (ent >= NR_IRQS) {
149                 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
150                 ent = 0;
151         } else {
152                 virt_irq_table[ent].dev_handle = dev_handle;
153                 virt_irq_table[ent].dev_ino = dev_ino;
154                 virt_irq_table[ent].in_use = 1;
155         }
156
157         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
158
159         return ent;
160 }
161
162 #ifdef CONFIG_PCI_MSI
163 void virt_irq_free(unsigned int virt_irq)
164 {
165         unsigned long flags;
166
167         if (virt_irq >= NR_IRQS)
168                 return;
169
170         spin_lock_irqsave(&virt_irq_alloc_lock, flags);
171
172         virt_irq_table[virt_irq].in_use = 0;
173
174         spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
175 }
176 #endif
177
178 /*
179  * /proc/interrupts printing:
180  */
181
182 int show_interrupts(struct seq_file *p, void *v)
183 {
184         int i = *(loff_t *) v, j;
185         struct irqaction * action;
186         unsigned long flags;
187
188         if (i == 0) {
189                 seq_printf(p, "           ");
190                 for_each_online_cpu(j)
191                         seq_printf(p, "CPU%d       ",j);
192                 seq_putc(p, '\n');
193         }
194
195         if (i < NR_IRQS) {
196                 spin_lock_irqsave(&irq_desc[i].lock, flags);
197                 action = irq_desc[i].action;
198                 if (!action)
199                         goto skip;
200                 seq_printf(p, "%3d: ",i);
201 #ifndef CONFIG_SMP
202                 seq_printf(p, "%10u ", kstat_irqs(i));
203 #else
204                 for_each_online_cpu(j)
205                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
206 #endif
207                 seq_printf(p, " %9s", irq_desc[i].chip->typename);
208                 seq_printf(p, "  %s", action->name);
209
210                 for (action=action->next; action; action = action->next)
211                         seq_printf(p, ", %s", action->name);
212
213                 seq_putc(p, '\n');
214 skip:
215                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
216         }
217         return 0;
218 }
219
220 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
221 {
222         unsigned int tid;
223
224         if (this_is_starfire) {
225                 tid = starfire_translate(imap, cpuid);
226                 tid <<= IMAP_TID_SHIFT;
227                 tid &= IMAP_TID_UPA;
228         } else {
229                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
230                         unsigned long ver;
231
232                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
233                         if ((ver >> 32UL) == __JALAPENO_ID ||
234                             (ver >> 32UL) == __SERRANO_ID) {
235                                 tid = cpuid << IMAP_TID_SHIFT;
236                                 tid &= IMAP_TID_JBUS;
237                         } else {
238                                 unsigned int a = cpuid & 0x1f;
239                                 unsigned int n = (cpuid >> 5) & 0x1f;
240
241                                 tid = ((a << IMAP_AID_SHIFT) |
242                                        (n << IMAP_NID_SHIFT));
243                                 tid &= (IMAP_AID_SAFARI |
244                                         IMAP_NID_SAFARI);;
245                         }
246                 } else {
247                         tid = cpuid << IMAP_TID_SHIFT;
248                         tid &= IMAP_TID_UPA;
249                 }
250         }
251
252         return tid;
253 }
254
255 struct irq_handler_data {
256         unsigned long   iclr;
257         unsigned long   imap;
258
259         void            (*pre_handler)(unsigned int, void *, void *);
260         void            *pre_handler_arg1;
261         void            *pre_handler_arg2;
262 };
263
264 #ifdef CONFIG_SMP
265 static int irq_choose_cpu(unsigned int virt_irq)
266 {
267         cpumask_t mask = irq_desc[virt_irq].affinity;
268         int cpuid;
269
270         if (cpus_equal(mask, CPU_MASK_ALL)) {
271                 static int irq_rover;
272                 static DEFINE_SPINLOCK(irq_rover_lock);
273                 unsigned long flags;
274
275                 /* Round-robin distribution... */
276         do_round_robin:
277                 spin_lock_irqsave(&irq_rover_lock, flags);
278
279                 while (!cpu_online(irq_rover)) {
280                         if (++irq_rover >= NR_CPUS)
281                                 irq_rover = 0;
282                 }
283                 cpuid = irq_rover;
284                 do {
285                         if (++irq_rover >= NR_CPUS)
286                                 irq_rover = 0;
287                 } while (!cpu_online(irq_rover));
288
289                 spin_unlock_irqrestore(&irq_rover_lock, flags);
290         } else {
291                 cpumask_t tmp;
292
293                 cpus_and(tmp, cpu_online_map, mask);
294
295                 if (cpus_empty(tmp))
296                         goto do_round_robin;
297
298                 cpuid = first_cpu(tmp);
299         }
300
301         return cpuid;
302 }
303 #else
304 static int irq_choose_cpu(unsigned int virt_irq)
305 {
306         return real_hard_smp_processor_id();
307 }
308 #endif
309
310 static void sun4u_irq_enable(unsigned int virt_irq)
311 {
312         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
313
314         if (likely(data)) {
315                 unsigned long cpuid, imap, val;
316                 unsigned int tid;
317
318                 cpuid = irq_choose_cpu(virt_irq);
319                 imap = data->imap;
320
321                 tid = sun4u_compute_tid(imap, cpuid);
322
323                 val = upa_readq(imap);
324                 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
325                          IMAP_AID_SAFARI | IMAP_NID_SAFARI);
326                 val |= tid | IMAP_VALID;
327                 upa_writeq(val, imap);
328         }
329 }
330
331 static void sun4u_set_affinity(unsigned int virt_irq, cpumask_t mask)
332 {
333         sun4u_irq_enable(virt_irq);
334 }
335
336 static void sun4u_irq_disable(unsigned int virt_irq)
337 {
338         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
339
340         if (likely(data)) {
341                 unsigned long imap = data->imap;
342                 unsigned long tmp = upa_readq(imap);
343
344                 tmp &= ~IMAP_VALID;
345                 upa_writeq(tmp, imap);
346         }
347 }
348
349 static void sun4u_irq_end(unsigned int virt_irq)
350 {
351         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
352         struct irq_desc *desc = irq_desc + virt_irq;
353
354         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
355                 return;
356
357         if (likely(data))
358                 upa_writeq(ICLR_IDLE, data->iclr);
359 }
360
361 static void sun4v_irq_enable(unsigned int virt_irq)
362 {
363         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
364         unsigned long cpuid = irq_choose_cpu(virt_irq);
365         int err;
366
367         err = sun4v_intr_settarget(ino, cpuid);
368         if (err != HV_EOK)
369                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
370                        "err(%d)\n", ino, cpuid, err);
371         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
372         if (err != HV_EOK)
373                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
374                        "err(%d)\n", ino, err);
375         err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
376         if (err != HV_EOK)
377                 printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
378                        ino, err);
379 }
380
381 static void sun4v_set_affinity(unsigned int virt_irq, cpumask_t mask)
382 {
383         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
384         unsigned long cpuid = irq_choose_cpu(virt_irq);
385         int err;
386
387         err = sun4v_intr_settarget(ino, cpuid);
388         if (err != HV_EOK)
389                 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
390                        "err(%d)\n", ino, cpuid, err);
391 }
392
393 static void sun4v_irq_disable(unsigned int virt_irq)
394 {
395         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
396         int err;
397
398         err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
399         if (err != HV_EOK)
400                 printk(KERN_ERR "sun4v_intr_setenabled(%x): "
401                        "err(%d)\n", ino, err);
402 }
403
404 static void sun4v_irq_end(unsigned int virt_irq)
405 {
406         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
407         struct irq_desc *desc = irq_desc + virt_irq;
408         int err;
409
410         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
411                 return;
412
413         err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
414         if (err != HV_EOK)
415                 printk(KERN_ERR "sun4v_intr_setstate(%x): "
416                        "err(%d)\n", ino, err);
417 }
418
419 static void sun4v_virq_enable(unsigned int virt_irq)
420 {
421         unsigned long cpuid, dev_handle, dev_ino;
422         int err;
423
424         cpuid = irq_choose_cpu(virt_irq);
425
426         dev_handle = virt_irq_table[virt_irq].dev_handle;
427         dev_ino = virt_irq_table[virt_irq].dev_ino;
428
429         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
430         if (err != HV_EOK)
431                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
432                        "err(%d)\n",
433                        dev_handle, dev_ino, cpuid, err);
434         err = sun4v_vintr_set_state(dev_handle, dev_ino,
435                                     HV_INTR_STATE_IDLE);
436         if (err != HV_EOK)
437                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
438                        "HV_INTR_STATE_IDLE): err(%d)\n",
439                        dev_handle, dev_ino, err);
440         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
441                                     HV_INTR_ENABLED);
442         if (err != HV_EOK)
443                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
444                        "HV_INTR_ENABLED): err(%d)\n",
445                        dev_handle, dev_ino, err);
446 }
447
448 static void sun4v_virt_set_affinity(unsigned int virt_irq, cpumask_t mask)
449 {
450         unsigned long cpuid, dev_handle, dev_ino;
451         int err;
452
453         cpuid = irq_choose_cpu(virt_irq);
454
455         dev_handle = virt_irq_table[virt_irq].dev_handle;
456         dev_ino = virt_irq_table[virt_irq].dev_ino;
457
458         err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
459         if (err != HV_EOK)
460                 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
461                        "err(%d)\n",
462                        dev_handle, dev_ino, cpuid, err);
463 }
464
465 static void sun4v_virq_disable(unsigned int virt_irq)
466 {
467         unsigned long dev_handle, dev_ino;
468         int err;
469
470         dev_handle = virt_irq_table[virt_irq].dev_handle;
471         dev_ino = virt_irq_table[virt_irq].dev_ino;
472
473         err = sun4v_vintr_set_valid(dev_handle, dev_ino,
474                                     HV_INTR_DISABLED);
475         if (err != HV_EOK)
476                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
477                        "HV_INTR_DISABLED): err(%d)\n",
478                        dev_handle, dev_ino, err);
479 }
480
481 static void sun4v_virq_end(unsigned int virt_irq)
482 {
483         struct irq_desc *desc = irq_desc + virt_irq;
484         unsigned long dev_handle, dev_ino;
485         int err;
486
487         if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
488                 return;
489
490         dev_handle = virt_irq_table[virt_irq].dev_handle;
491         dev_ino = virt_irq_table[virt_irq].dev_ino;
492
493         err = sun4v_vintr_set_state(dev_handle, dev_ino,
494                                     HV_INTR_STATE_IDLE);
495         if (err != HV_EOK)
496                 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
497                        "HV_INTR_STATE_IDLE): err(%d)\n",
498                        dev_handle, dev_ino, err);
499 }
500
501 static void run_pre_handler(unsigned int virt_irq)
502 {
503         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
504         unsigned int ino;
505
506         ino = virt_irq_table[virt_irq].dev_ino;
507         if (likely(data->pre_handler)) {
508                 data->pre_handler(ino,
509                                   data->pre_handler_arg1,
510                                   data->pre_handler_arg2);
511         }
512 }
513
514 static struct irq_chip sun4u_irq = {
515         .typename       = "sun4u",
516         .enable         = sun4u_irq_enable,
517         .disable        = sun4u_irq_disable,
518         .end            = sun4u_irq_end,
519         .set_affinity   = sun4u_set_affinity,
520 };
521
522 static struct irq_chip sun4u_irq_ack = {
523         .typename       = "sun4u+ack",
524         .enable         = sun4u_irq_enable,
525         .disable        = sun4u_irq_disable,
526         .ack            = run_pre_handler,
527         .end            = sun4u_irq_end,
528         .set_affinity   = sun4u_set_affinity,
529 };
530
531 static struct irq_chip sun4v_irq = {
532         .typename       = "sun4v",
533         .enable         = sun4v_irq_enable,
534         .disable        = sun4v_irq_disable,
535         .end            = sun4v_irq_end,
536         .set_affinity   = sun4v_set_affinity,
537 };
538
539 static struct irq_chip sun4v_virq = {
540         .typename       = "vsun4v",
541         .enable         = sun4v_virq_enable,
542         .disable        = sun4v_virq_disable,
543         .end            = sun4v_virq_end,
544         .set_affinity   = sun4v_virt_set_affinity,
545 };
546
547 void irq_install_pre_handler(int virt_irq,
548                              void (*func)(unsigned int, void *, void *),
549                              void *arg1, void *arg2)
550 {
551         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
552         struct irq_chip *chip = get_irq_chip(virt_irq);
553
554         if (WARN_ON(chip == &sun4v_irq || chip == &sun4v_virq)) {
555                 printk(KERN_ERR "IRQ: Trying to install pre-handler on "
556                        "sun4v irq %u\n", virt_irq);
557                 return;
558         }
559
560         data->pre_handler = func;
561         data->pre_handler_arg1 = arg1;
562         data->pre_handler_arg2 = arg2;
563
564         if (chip == &sun4u_irq_ack)
565                 return;
566
567         set_irq_chip(virt_irq, &sun4u_irq_ack);
568 }
569
570 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
571 {
572         struct ino_bucket *bucket;
573         struct irq_handler_data *data;
574         unsigned int virt_irq;
575         int ino;
576
577         BUG_ON(tlb_type == hypervisor);
578
579         ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
580         bucket = &ivector_table[ino];
581         virt_irq = bucket_get_virt_irq(__pa(bucket));
582         if (!virt_irq) {
583                 virt_irq = virt_irq_alloc(0, ino);
584                 bucket_set_virt_irq(__pa(bucket), virt_irq);
585                 set_irq_chip(virt_irq, &sun4u_irq);
586         }
587
588         data = get_irq_chip_data(virt_irq);
589         if (unlikely(data))
590                 goto out;
591
592         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
593         if (unlikely(!data)) {
594                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
595                 prom_halt();
596         }
597         set_irq_chip_data(virt_irq, data);
598
599         data->imap  = imap;
600         data->iclr  = iclr;
601
602 out:
603         return virt_irq;
604 }
605
606 static unsigned int sun4v_build_common(unsigned long sysino,
607                                        struct irq_chip *chip)
608 {
609         struct ino_bucket *bucket;
610         struct irq_handler_data *data;
611         unsigned int virt_irq;
612
613         BUG_ON(tlb_type != hypervisor);
614
615         bucket = &ivector_table[sysino];
616         virt_irq = bucket_get_virt_irq(__pa(bucket));
617         if (!virt_irq) {
618                 virt_irq = virt_irq_alloc(0, sysino);
619                 bucket_set_virt_irq(__pa(bucket), virt_irq);
620                 set_irq_chip(virt_irq, chip);
621         }
622
623         data = get_irq_chip_data(virt_irq);
624         if (unlikely(data))
625                 goto out;
626
627         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
628         if (unlikely(!data)) {
629                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
630                 prom_halt();
631         }
632         set_irq_chip_data(virt_irq, data);
633
634         /* Catch accidental accesses to these things.  IMAP/ICLR handling
635          * is done by hypervisor calls on sun4v platforms, not by direct
636          * register accesses.
637          */
638         data->imap = ~0UL;
639         data->iclr = ~0UL;
640
641 out:
642         return virt_irq;
643 }
644
645 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
646 {
647         unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
648
649         return sun4v_build_common(sysino, &sun4v_irq);
650 }
651
652 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
653 {
654         struct irq_handler_data *data;
655         struct ino_bucket *bucket;
656         unsigned long hv_err, cookie;
657         unsigned int virt_irq;
658
659         bucket = kzalloc(sizeof(struct ino_bucket), GFP_ATOMIC);
660         if (unlikely(!bucket))
661                 return 0;
662         __flush_dcache_range((unsigned long) bucket,
663                              ((unsigned long) bucket +
664                               sizeof(struct ino_bucket)));
665
666         virt_irq = virt_irq_alloc(devhandle, devino);
667         bucket_set_virt_irq(__pa(bucket), virt_irq);
668         set_irq_chip(virt_irq, &sun4v_virq);
669
670         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
671         if (unlikely(!data))
672                 return 0;
673
674         set_irq_chip_data(virt_irq, data);
675
676         /* Catch accidental accesses to these things.  IMAP/ICLR handling
677          * is done by hypervisor calls on sun4v platforms, not by direct
678          * register accesses.
679          */
680         data->imap = ~0UL;
681         data->iclr = ~0UL;
682
683         cookie = ~__pa(bucket);
684         hv_err = sun4v_vintr_set_cookie(devhandle, devino, cookie);
685         if (hv_err) {
686                 prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] "
687                             "err=%lu\n", devhandle, devino, hv_err);
688                 prom_halt();
689         }
690
691         return virt_irq;
692 }
693
694 void ack_bad_irq(unsigned int virt_irq)
695 {
696         unsigned int ino = virt_irq_table[virt_irq].dev_ino;
697
698         if (!ino)
699                 ino = 0xdeadbeef;
700
701         printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
702                ino, virt_irq);
703 }
704
705 void handler_irq(int irq, struct pt_regs *regs)
706 {
707         unsigned long pstate, bucket_pa;
708         struct pt_regs *old_regs;
709
710         clear_softint(1 << irq);
711
712         old_regs = set_irq_regs(regs);
713         irq_enter();
714
715         /* Grab an atomic snapshot of the pending IVECs.  */
716         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
717                              "wrpr      %0, %3, %%pstate\n\t"
718                              "ldx       [%2], %1\n\t"
719                              "stx       %%g0, [%2]\n\t"
720                              "wrpr      %0, 0x0, %%pstate\n\t"
721                              : "=&r" (pstate), "=&r" (bucket_pa)
722                              : "r" (irq_work_pa(smp_processor_id())),
723                                "i" (PSTATE_IE)
724                              : "memory");
725
726         while (bucket_pa) {
727                 unsigned long next_pa;
728                 unsigned int virt_irq;
729
730                 next_pa = bucket_get_chain_pa(bucket_pa);
731                 virt_irq = bucket_get_virt_irq(bucket_pa);
732                 bucket_clear_chain_pa(bucket_pa);
733
734                 __do_IRQ(virt_irq);
735
736                 bucket_pa = next_pa;
737         }
738
739         irq_exit();
740         set_irq_regs(old_regs);
741 }
742
743 #ifdef CONFIG_HOTPLUG_CPU
744 void fixup_irqs(void)
745 {
746         unsigned int irq;
747
748         for (irq = 0; irq < NR_IRQS; irq++) {
749                 unsigned long flags;
750
751                 spin_lock_irqsave(&irq_desc[irq].lock, flags);
752                 if (irq_desc[irq].action &&
753                     !(irq_desc[irq].status & IRQ_PER_CPU)) {
754                         if (irq_desc[irq].chip->set_affinity)
755                                 irq_desc[irq].chip->set_affinity(irq,
756                                         irq_desc[irq].affinity);
757                 }
758                 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
759         }
760 }
761 #endif
762
763 struct sun5_timer {
764         u64     count0;
765         u64     limit0;
766         u64     count1;
767         u64     limit1;
768 };
769
770 static struct sun5_timer *prom_timers;
771 static u64 prom_limit0, prom_limit1;
772
773 static void map_prom_timers(void)
774 {
775         struct device_node *dp;
776         const unsigned int *addr;
777
778         /* PROM timer node hangs out in the top level of device siblings... */
779         dp = of_find_node_by_path("/");
780         dp = dp->child;
781         while (dp) {
782                 if (!strcmp(dp->name, "counter-timer"))
783                         break;
784                 dp = dp->sibling;
785         }
786
787         /* Assume if node is not present, PROM uses different tick mechanism
788          * which we should not care about.
789          */
790         if (!dp) {
791                 prom_timers = (struct sun5_timer *) 0;
792                 return;
793         }
794
795         /* If PROM is really using this, it must be mapped by him. */
796         addr = of_get_property(dp, "address", NULL);
797         if (!addr) {
798                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
799                 prom_timers = (struct sun5_timer *) 0;
800                 return;
801         }
802         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
803 }
804
805 static void kill_prom_timer(void)
806 {
807         if (!prom_timers)
808                 return;
809
810         /* Save them away for later. */
811         prom_limit0 = prom_timers->limit0;
812         prom_limit1 = prom_timers->limit1;
813
814         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
815          * We turn both off here just to be paranoid.
816          */
817         prom_timers->limit0 = 0;
818         prom_timers->limit1 = 0;
819
820         /* Wheee, eat the interrupt packet too... */
821         __asm__ __volatile__(
822 "       mov     0x40, %%g2\n"
823 "       ldxa    [%%g0] %0, %%g1\n"
824 "       ldxa    [%%g2] %1, %%g1\n"
825 "       stxa    %%g0, [%%g0] %0\n"
826 "       membar  #Sync\n"
827         : /* no outputs */
828         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
829         : "g1", "g2");
830 }
831
832 void init_irqwork_curcpu(void)
833 {
834         int cpu = hard_smp_processor_id();
835
836         trap_block[cpu].irq_worklist_pa = 0UL;
837 }
838
839 /* Please be very careful with register_one_mondo() and
840  * sun4v_register_mondo_queues().
841  *
842  * On SMP this gets invoked from the CPU trampoline before
843  * the cpu has fully taken over the trap table from OBP,
844  * and it's kernel stack + %g6 thread register state is
845  * not fully cooked yet.
846  *
847  * Therefore you cannot make any OBP calls, not even prom_printf,
848  * from these two routines.
849  */
850 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)
851 {
852         unsigned long num_entries = (qmask + 1) / 64;
853         unsigned long status;
854
855         status = sun4v_cpu_qconf(type, paddr, num_entries);
856         if (status != HV_EOK) {
857                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
858                             "err %lu\n", type, paddr, num_entries, status);
859                 prom_halt();
860         }
861 }
862
863 void __cpuinit sun4v_register_mondo_queues(int this_cpu)
864 {
865         struct trap_per_cpu *tb = &trap_block[this_cpu];
866
867         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
868                            tb->cpu_mondo_qmask);
869         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
870                            tb->dev_mondo_qmask);
871         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
872                            tb->resum_qmask);
873         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
874                            tb->nonresum_qmask);
875 }
876
877 static void __init alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask)
878 {
879         unsigned long size = PAGE_ALIGN(qmask + 1);
880         void *p = __alloc_bootmem_low(size, size, 0);
881         if (!p) {
882                 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
883                 prom_halt();
884         }
885
886         *pa_ptr = __pa(p);
887 }
888
889 static void __init alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask)
890 {
891         unsigned long size = PAGE_ALIGN(qmask + 1);
892         void *p = __alloc_bootmem_low(size, size, 0);
893
894         if (!p) {
895                 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
896                 prom_halt();
897         }
898
899         *pa_ptr = __pa(p);
900 }
901
902 static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
903 {
904 #ifdef CONFIG_SMP
905         void *page;
906
907         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
908
909         page = alloc_bootmem_low_pages(PAGE_SIZE);
910         if (!page) {
911                 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
912                 prom_halt();
913         }
914
915         tb->cpu_mondo_block_pa = __pa(page);
916         tb->cpu_list_pa = __pa(page + 64);
917 #endif
918 }
919
920 /* Allocate mondo and error queues for all possible cpus.  */
921 static void __init sun4v_init_mondo_queues(void)
922 {
923         int cpu;
924
925         for_each_possible_cpu(cpu) {
926                 struct trap_per_cpu *tb = &trap_block[cpu];
927
928                 alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
929                 alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
930                 alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask);
931                 alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask);
932                 alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
933                 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa,
934                                tb->nonresum_qmask);
935
936                 init_cpu_send_mondo_info(tb);
937         }
938
939         /* Load up the boot cpu's entries.  */
940         sun4v_register_mondo_queues(hard_smp_processor_id());
941 }
942
943 static struct irqaction timer_irq_action = {
944         .name = "timer",
945 };
946
947 /* Only invoked on boot processor. */
948 void __init init_IRQ(void)
949 {
950         unsigned long size;
951
952         map_prom_timers();
953         kill_prom_timer();
954
955         size = sizeof(struct ino_bucket) * NUM_IVECS;
956         ivector_table = alloc_bootmem_low(size);
957         if (!ivector_table) {
958                 prom_printf("Fatal error, cannot allocate ivector_table\n");
959                 prom_halt();
960         }
961         __flush_dcache_range((unsigned long) ivector_table,
962                              ((unsigned long) ivector_table) + size);
963
964         ivector_table_pa = __pa(ivector_table);
965
966         if (tlb_type == hypervisor)
967                 sun4v_init_mondo_queues();
968
969         /* We need to clear any IRQ's pending in the soft interrupt
970          * registers, a spurious one could be left around from the
971          * PROM timer which we just disabled.
972          */
973         clear_softint(get_softint());
974
975         /* Now that ivector table is initialized, it is safe
976          * to receive IRQ vector traps.  We will normally take
977          * one or two right now, in case some device PROM used
978          * to boot us wants to speak to us.  We just ignore them.
979          */
980         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
981                              "or        %%g1, %0, %%g1\n\t"
982                              "wrpr      %%g1, 0x0, %%pstate"
983                              : /* No outputs */
984                              : "i" (PSTATE_IE)
985                              : "g1");
986
987         irq_desc[0].action = &timer_irq_action;
988 }