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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[deliverable/linux.git] / arch / sparc64 / kernel / irq.c
1 /* irq.c: UltraSparc IRQ handling/init/registry.
2 *
3 * Copyright (C) 1997, 2007, 2008 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 #include "entry.h"
48
49 #define NUM_IVECS (IMAP_INR + 1)
50
51 struct ino_bucket *ivector_table;
52 unsigned long ivector_table_pa;
53
54 /* On several sun4u processors, it is illegal to mix bypass and
55 * non-bypass accesses. Therefore we access all INO buckets
56 * using bypass accesses only.
57 */
58 static unsigned long bucket_get_chain_pa(unsigned long bucket_pa)
59 {
60 unsigned long ret;
61
62 __asm__ __volatile__("ldxa [%1] %2, %0"
63 : "=&r" (ret)
64 : "r" (bucket_pa +
65 offsetof(struct ino_bucket,
66 __irq_chain_pa)),
67 "i" (ASI_PHYS_USE_EC));
68
69 return ret;
70 }
71
72 static void bucket_clear_chain_pa(unsigned long bucket_pa)
73 {
74 __asm__ __volatile__("stxa %%g0, [%0] %1"
75 : /* no outputs */
76 : "r" (bucket_pa +
77 offsetof(struct ino_bucket,
78 __irq_chain_pa)),
79 "i" (ASI_PHYS_USE_EC));
80 }
81
82 static unsigned int bucket_get_virt_irq(unsigned long bucket_pa)
83 {
84 unsigned int ret;
85
86 __asm__ __volatile__("lduwa [%1] %2, %0"
87 : "=&r" (ret)
88 : "r" (bucket_pa +
89 offsetof(struct ino_bucket,
90 __virt_irq)),
91 "i" (ASI_PHYS_USE_EC));
92
93 return ret;
94 }
95
96 static void bucket_set_virt_irq(unsigned long bucket_pa,
97 unsigned int virt_irq)
98 {
99 __asm__ __volatile__("stwa %0, [%1] %2"
100 : /* no outputs */
101 : "r" (virt_irq),
102 "r" (bucket_pa +
103 offsetof(struct ino_bucket,
104 __virt_irq)),
105 "i" (ASI_PHYS_USE_EC));
106 }
107
108 #define irq_work_pa(__cpu) &(trap_block[(__cpu)].irq_worklist_pa)
109
110 static struct {
111 unsigned int dev_handle;
112 unsigned int dev_ino;
113 unsigned int in_use;
114 } virt_irq_table[NR_IRQS];
115 static DEFINE_SPINLOCK(virt_irq_alloc_lock);
116
117 unsigned char virt_irq_alloc(unsigned int dev_handle,
118 unsigned int dev_ino)
119 {
120 unsigned long flags;
121 unsigned char ent;
122
123 BUILD_BUG_ON(NR_IRQS >= 256);
124
125 spin_lock_irqsave(&virt_irq_alloc_lock, flags);
126
127 for (ent = 1; ent < NR_IRQS; ent++) {
128 if (!virt_irq_table[ent].in_use)
129 break;
130 }
131 if (ent >= NR_IRQS) {
132 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
133 ent = 0;
134 } else {
135 virt_irq_table[ent].dev_handle = dev_handle;
136 virt_irq_table[ent].dev_ino = dev_ino;
137 virt_irq_table[ent].in_use = 1;
138 }
139
140 spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
141
142 return ent;
143 }
144
145 #ifdef CONFIG_PCI_MSI
146 void virt_irq_free(unsigned int virt_irq)
147 {
148 unsigned long flags;
149
150 if (virt_irq >= NR_IRQS)
151 return;
152
153 spin_lock_irqsave(&virt_irq_alloc_lock, flags);
154
155 virt_irq_table[virt_irq].in_use = 0;
156
157 spin_unlock_irqrestore(&virt_irq_alloc_lock, flags);
158 }
159 #endif
160
161 /*
162 * /proc/interrupts printing:
163 */
164
165 int show_interrupts(struct seq_file *p, void *v)
166 {
167 int i = *(loff_t *) v, j;
168 struct irqaction * action;
169 unsigned long flags;
170
171 if (i == 0) {
172 seq_printf(p, " ");
173 for_each_online_cpu(j)
174 seq_printf(p, "CPU%d ",j);
175 seq_putc(p, '\n');
176 }
177
178 if (i < NR_IRQS) {
179 spin_lock_irqsave(&irq_desc[i].lock, flags);
180 action = irq_desc[i].action;
181 if (!action)
182 goto skip;
183 seq_printf(p, "%3d: ",i);
184 #ifndef CONFIG_SMP
185 seq_printf(p, "%10u ", kstat_irqs(i));
186 #else
187 for_each_online_cpu(j)
188 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
189 #endif
190 seq_printf(p, " %9s", irq_desc[i].chip->typename);
191 seq_printf(p, " %s", action->name);
192
193 for (action=action->next; action; action = action->next)
194 seq_printf(p, ", %s", action->name);
195
196 seq_putc(p, '\n');
197 skip:
198 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
199 }
200 return 0;
201 }
202
203 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
204 {
205 unsigned int tid;
206
207 if (this_is_starfire) {
208 tid = starfire_translate(imap, cpuid);
209 tid <<= IMAP_TID_SHIFT;
210 tid &= IMAP_TID_UPA;
211 } else {
212 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
213 unsigned long ver;
214
215 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
216 if ((ver >> 32UL) == __JALAPENO_ID ||
217 (ver >> 32UL) == __SERRANO_ID) {
218 tid = cpuid << IMAP_TID_SHIFT;
219 tid &= IMAP_TID_JBUS;
220 } else {
221 unsigned int a = cpuid & 0x1f;
222 unsigned int n = (cpuid >> 5) & 0x1f;
223
224 tid = ((a << IMAP_AID_SHIFT) |
225 (n << IMAP_NID_SHIFT));
226 tid &= (IMAP_AID_SAFARI |
227 IMAP_NID_SAFARI);;
228 }
229 } else {
230 tid = cpuid << IMAP_TID_SHIFT;
231 tid &= IMAP_TID_UPA;
232 }
233 }
234
235 return tid;
236 }
237
238 struct irq_handler_data {
239 unsigned long iclr;
240 unsigned long imap;
241
242 void (*pre_handler)(unsigned int, void *, void *);
243 void *arg1;
244 void *arg2;
245 };
246
247 #ifdef CONFIG_SMP
248 static int irq_choose_cpu(unsigned int virt_irq)
249 {
250 cpumask_t mask = irq_desc[virt_irq].affinity;
251 int cpuid;
252
253 if (cpus_equal(mask, CPU_MASK_ALL)) {
254 static int irq_rover;
255 static DEFINE_SPINLOCK(irq_rover_lock);
256 unsigned long flags;
257
258 /* Round-robin distribution... */
259 do_round_robin:
260 spin_lock_irqsave(&irq_rover_lock, flags);
261
262 while (!cpu_online(irq_rover)) {
263 if (++irq_rover >= NR_CPUS)
264 irq_rover = 0;
265 }
266 cpuid = irq_rover;
267 do {
268 if (++irq_rover >= NR_CPUS)
269 irq_rover = 0;
270 } while (!cpu_online(irq_rover));
271
272 spin_unlock_irqrestore(&irq_rover_lock, flags);
273 } else {
274 cpumask_t tmp;
275
276 cpus_and(tmp, cpu_online_map, mask);
277
278 if (cpus_empty(tmp))
279 goto do_round_robin;
280
281 cpuid = first_cpu(tmp);
282 }
283
284 return cpuid;
285 }
286 #else
287 static int irq_choose_cpu(unsigned int virt_irq)
288 {
289 return real_hard_smp_processor_id();
290 }
291 #endif
292
293 static void sun4u_irq_enable(unsigned int virt_irq)
294 {
295 struct irq_handler_data *data = get_irq_chip_data(virt_irq);
296
297 if (likely(data)) {
298 unsigned long cpuid, imap, val;
299 unsigned int tid;
300
301 cpuid = irq_choose_cpu(virt_irq);
302 imap = data->imap;
303
304 tid = sun4u_compute_tid(imap, cpuid);
305
306 val = upa_readq(imap);
307 val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
308 IMAP_AID_SAFARI | IMAP_NID_SAFARI);
309 val |= tid | IMAP_VALID;
310 upa_writeq(val, imap);
311 upa_writeq(ICLR_IDLE, data->iclr);
312 }
313 }
314
315 static void sun4u_set_affinity(unsigned int virt_irq, cpumask_t mask)
316 {
317 sun4u_irq_enable(virt_irq);
318 }
319
320 static void sun4u_irq_disable(unsigned int virt_irq)
321 {
322 struct irq_handler_data *data = get_irq_chip_data(virt_irq);
323
324 if (likely(data)) {
325 unsigned long imap = data->imap;
326 unsigned long tmp = upa_readq(imap);
327
328 tmp &= ~IMAP_VALID;
329 upa_writeq(tmp, imap);
330 }
331 }
332
333 static void sun4u_irq_eoi(unsigned int virt_irq)
334 {
335 struct irq_handler_data *data = get_irq_chip_data(virt_irq);
336 struct irq_desc *desc = irq_desc + virt_irq;
337
338 if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
339 return;
340
341 if (likely(data))
342 upa_writeq(ICLR_IDLE, data->iclr);
343 }
344
345 static void sun4v_irq_enable(unsigned int virt_irq)
346 {
347 unsigned int ino = virt_irq_table[virt_irq].dev_ino;
348 unsigned long cpuid = irq_choose_cpu(virt_irq);
349 int err;
350
351 err = sun4v_intr_settarget(ino, cpuid);
352 if (err != HV_EOK)
353 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
354 "err(%d)\n", ino, cpuid, err);
355 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
356 if (err != HV_EOK)
357 printk(KERN_ERR "sun4v_intr_setstate(%x): "
358 "err(%d)\n", ino, err);
359 err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
360 if (err != HV_EOK)
361 printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
362 ino, err);
363 }
364
365 static void sun4v_set_affinity(unsigned int virt_irq, cpumask_t mask)
366 {
367 unsigned int ino = virt_irq_table[virt_irq].dev_ino;
368 unsigned long cpuid = irq_choose_cpu(virt_irq);
369 int err;
370
371 err = sun4v_intr_settarget(ino, cpuid);
372 if (err != HV_EOK)
373 printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
374 "err(%d)\n", ino, cpuid, err);
375 }
376
377 static void sun4v_irq_disable(unsigned int virt_irq)
378 {
379 unsigned int ino = virt_irq_table[virt_irq].dev_ino;
380 int err;
381
382 err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
383 if (err != HV_EOK)
384 printk(KERN_ERR "sun4v_intr_setenabled(%x): "
385 "err(%d)\n", ino, err);
386 }
387
388 static void sun4v_irq_eoi(unsigned int virt_irq)
389 {
390 unsigned int ino = virt_irq_table[virt_irq].dev_ino;
391 struct irq_desc *desc = irq_desc + virt_irq;
392 int err;
393
394 if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
395 return;
396
397 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
398 if (err != HV_EOK)
399 printk(KERN_ERR "sun4v_intr_setstate(%x): "
400 "err(%d)\n", ino, err);
401 }
402
403 static void sun4v_virq_enable(unsigned int virt_irq)
404 {
405 unsigned long cpuid, dev_handle, dev_ino;
406 int err;
407
408 cpuid = irq_choose_cpu(virt_irq);
409
410 dev_handle = virt_irq_table[virt_irq].dev_handle;
411 dev_ino = virt_irq_table[virt_irq].dev_ino;
412
413 err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
414 if (err != HV_EOK)
415 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
416 "err(%d)\n",
417 dev_handle, dev_ino, cpuid, err);
418 err = sun4v_vintr_set_state(dev_handle, dev_ino,
419 HV_INTR_STATE_IDLE);
420 if (err != HV_EOK)
421 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
422 "HV_INTR_STATE_IDLE): err(%d)\n",
423 dev_handle, dev_ino, err);
424 err = sun4v_vintr_set_valid(dev_handle, dev_ino,
425 HV_INTR_ENABLED);
426 if (err != HV_EOK)
427 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
428 "HV_INTR_ENABLED): err(%d)\n",
429 dev_handle, dev_ino, err);
430 }
431
432 static void sun4v_virt_set_affinity(unsigned int virt_irq, cpumask_t mask)
433 {
434 unsigned long cpuid, dev_handle, dev_ino;
435 int err;
436
437 cpuid = irq_choose_cpu(virt_irq);
438
439 dev_handle = virt_irq_table[virt_irq].dev_handle;
440 dev_ino = virt_irq_table[virt_irq].dev_ino;
441
442 err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
443 if (err != HV_EOK)
444 printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
445 "err(%d)\n",
446 dev_handle, dev_ino, cpuid, err);
447 }
448
449 static void sun4v_virq_disable(unsigned int virt_irq)
450 {
451 unsigned long dev_handle, dev_ino;
452 int err;
453
454 dev_handle = virt_irq_table[virt_irq].dev_handle;
455 dev_ino = virt_irq_table[virt_irq].dev_ino;
456
457 err = sun4v_vintr_set_valid(dev_handle, dev_ino,
458 HV_INTR_DISABLED);
459 if (err != HV_EOK)
460 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
461 "HV_INTR_DISABLED): err(%d)\n",
462 dev_handle, dev_ino, err);
463 }
464
465 static void sun4v_virq_eoi(unsigned int virt_irq)
466 {
467 struct irq_desc *desc = irq_desc + virt_irq;
468 unsigned long dev_handle, dev_ino;
469 int err;
470
471 if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
472 return;
473
474 dev_handle = virt_irq_table[virt_irq].dev_handle;
475 dev_ino = virt_irq_table[virt_irq].dev_ino;
476
477 err = sun4v_vintr_set_state(dev_handle, dev_ino,
478 HV_INTR_STATE_IDLE);
479 if (err != HV_EOK)
480 printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
481 "HV_INTR_STATE_IDLE): err(%d)\n",
482 dev_handle, dev_ino, err);
483 }
484
485 static struct irq_chip sun4u_irq = {
486 .typename = "sun4u",
487 .enable = sun4u_irq_enable,
488 .disable = sun4u_irq_disable,
489 .eoi = sun4u_irq_eoi,
490 .set_affinity = sun4u_set_affinity,
491 };
492
493 static struct irq_chip sun4v_irq = {
494 .typename = "sun4v",
495 .enable = sun4v_irq_enable,
496 .disable = sun4v_irq_disable,
497 .eoi = sun4v_irq_eoi,
498 .set_affinity = sun4v_set_affinity,
499 };
500
501 static struct irq_chip sun4v_virq = {
502 .typename = "vsun4v",
503 .enable = sun4v_virq_enable,
504 .disable = sun4v_virq_disable,
505 .eoi = sun4v_virq_eoi,
506 .set_affinity = sun4v_virt_set_affinity,
507 };
508
509 static void pre_flow_handler(unsigned int virt_irq,
510 struct irq_desc *desc)
511 {
512 struct irq_handler_data *data = get_irq_chip_data(virt_irq);
513 unsigned int ino = virt_irq_table[virt_irq].dev_ino;
514
515 data->pre_handler(ino, data->arg1, data->arg2);
516
517 handle_fasteoi_irq(virt_irq, desc);
518 }
519
520 void irq_install_pre_handler(int virt_irq,
521 void (*func)(unsigned int, void *, void *),
522 void *arg1, void *arg2)
523 {
524 struct irq_handler_data *data = get_irq_chip_data(virt_irq);
525 struct irq_desc *desc = irq_desc + virt_irq;
526
527 data->pre_handler = func;
528 data->arg1 = arg1;
529 data->arg2 = arg2;
530
531 desc->handle_irq = pre_flow_handler;
532 }
533
534 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
535 {
536 struct ino_bucket *bucket;
537 struct irq_handler_data *data;
538 unsigned int virt_irq;
539 int ino;
540
541 BUG_ON(tlb_type == hypervisor);
542
543 ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
544 bucket = &ivector_table[ino];
545 virt_irq = bucket_get_virt_irq(__pa(bucket));
546 if (!virt_irq) {
547 virt_irq = virt_irq_alloc(0, ino);
548 bucket_set_virt_irq(__pa(bucket), virt_irq);
549 set_irq_chip_and_handler_name(virt_irq,
550 &sun4u_irq,
551 handle_fasteoi_irq,
552 "IVEC");
553 }
554
555 data = get_irq_chip_data(virt_irq);
556 if (unlikely(data))
557 goto out;
558
559 data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
560 if (unlikely(!data)) {
561 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
562 prom_halt();
563 }
564 set_irq_chip_data(virt_irq, data);
565
566 data->imap = imap;
567 data->iclr = iclr;
568
569 out:
570 return virt_irq;
571 }
572
573 static unsigned int sun4v_build_common(unsigned long sysino,
574 struct irq_chip *chip)
575 {
576 struct ino_bucket *bucket;
577 struct irq_handler_data *data;
578 unsigned int virt_irq;
579
580 BUG_ON(tlb_type != hypervisor);
581
582 bucket = &ivector_table[sysino];
583 virt_irq = bucket_get_virt_irq(__pa(bucket));
584 if (!virt_irq) {
585 virt_irq = virt_irq_alloc(0, sysino);
586 bucket_set_virt_irq(__pa(bucket), virt_irq);
587 set_irq_chip_and_handler_name(virt_irq, chip,
588 handle_fasteoi_irq,
589 "IVEC");
590 }
591
592 data = get_irq_chip_data(virt_irq);
593 if (unlikely(data))
594 goto out;
595
596 data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
597 if (unlikely(!data)) {
598 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
599 prom_halt();
600 }
601 set_irq_chip_data(virt_irq, data);
602
603 /* Catch accidental accesses to these things. IMAP/ICLR handling
604 * is done by hypervisor calls on sun4v platforms, not by direct
605 * register accesses.
606 */
607 data->imap = ~0UL;
608 data->iclr = ~0UL;
609
610 out:
611 return virt_irq;
612 }
613
614 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
615 {
616 unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
617
618 return sun4v_build_common(sysino, &sun4v_irq);
619 }
620
621 unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
622 {
623 struct irq_handler_data *data;
624 unsigned long hv_err, cookie;
625 struct ino_bucket *bucket;
626 struct irq_desc *desc;
627 unsigned int virt_irq;
628
629 bucket = kzalloc(sizeof(struct ino_bucket), GFP_ATOMIC);
630 if (unlikely(!bucket))
631 return 0;
632 __flush_dcache_range((unsigned long) bucket,
633 ((unsigned long) bucket +
634 sizeof(struct ino_bucket)));
635
636 virt_irq = virt_irq_alloc(devhandle, devino);
637 bucket_set_virt_irq(__pa(bucket), virt_irq);
638
639 set_irq_chip_and_handler_name(virt_irq, &sun4v_virq,
640 handle_fasteoi_irq,
641 "IVEC");
642
643 data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
644 if (unlikely(!data))
645 return 0;
646
647 /* In order to make the LDC channel startup sequence easier,
648 * especially wrt. locking, we do not let request_irq() enable
649 * the interrupt.
650 */
651 desc = irq_desc + virt_irq;
652 desc->status |= IRQ_NOAUTOEN;
653
654 set_irq_chip_data(virt_irq, data);
655
656 /* Catch accidental accesses to these things. IMAP/ICLR handling
657 * is done by hypervisor calls on sun4v platforms, not by direct
658 * register accesses.
659 */
660 data->imap = ~0UL;
661 data->iclr = ~0UL;
662
663 cookie = ~__pa(bucket);
664 hv_err = sun4v_vintr_set_cookie(devhandle, devino, cookie);
665 if (hv_err) {
666 prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] "
667 "err=%lu\n", devhandle, devino, hv_err);
668 prom_halt();
669 }
670
671 return virt_irq;
672 }
673
674 void ack_bad_irq(unsigned int virt_irq)
675 {
676 unsigned int ino = virt_irq_table[virt_irq].dev_ino;
677
678 if (!ino)
679 ino = 0xdeadbeef;
680
681 printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
682 ino, virt_irq);
683 }
684
685 void *hardirq_stack[NR_CPUS];
686 void *softirq_stack[NR_CPUS];
687
688 static __attribute__((always_inline)) void *set_hardirq_stack(void)
689 {
690 void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
691
692 __asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
693 if (orig_sp < sp ||
694 orig_sp > (sp + THREAD_SIZE)) {
695 sp += THREAD_SIZE - 192 - STACK_BIAS;
696 __asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
697 }
698
699 return orig_sp;
700 }
701 static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
702 {
703 __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
704 }
705
706 void handler_irq(int irq, struct pt_regs *regs)
707 {
708 unsigned long pstate, bucket_pa;
709 struct pt_regs *old_regs;
710 void *orig_sp;
711
712 clear_softint(1 << irq);
713
714 old_regs = set_irq_regs(regs);
715 irq_enter();
716
717 /* Grab an atomic snapshot of the pending IVECs. */
718 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
719 "wrpr %0, %3, %%pstate\n\t"
720 "ldx [%2], %1\n\t"
721 "stx %%g0, [%2]\n\t"
722 "wrpr %0, 0x0, %%pstate\n\t"
723 : "=&r" (pstate), "=&r" (bucket_pa)
724 : "r" (irq_work_pa(smp_processor_id())),
725 "i" (PSTATE_IE)
726 : "memory");
727
728 orig_sp = set_hardirq_stack();
729
730 while (bucket_pa) {
731 struct irq_desc *desc;
732 unsigned long next_pa;
733 unsigned int virt_irq;
734
735 next_pa = bucket_get_chain_pa(bucket_pa);
736 virt_irq = bucket_get_virt_irq(bucket_pa);
737 bucket_clear_chain_pa(bucket_pa);
738
739 desc = irq_desc + virt_irq;
740
741 desc->handle_irq(virt_irq, desc);
742
743 bucket_pa = next_pa;
744 }
745
746 restore_hardirq_stack(orig_sp);
747
748 irq_exit();
749 set_irq_regs(old_regs);
750 }
751
752 void do_softirq(void)
753 {
754 unsigned long flags;
755
756 if (in_interrupt())
757 return;
758
759 local_irq_save(flags);
760
761 if (local_softirq_pending()) {
762 void *orig_sp, *sp = softirq_stack[smp_processor_id()];
763
764 sp += THREAD_SIZE - 192 - STACK_BIAS;
765
766 __asm__ __volatile__("mov %%sp, %0\n\t"
767 "mov %1, %%sp"
768 : "=&r" (orig_sp)
769 : "r" (sp));
770 __do_softirq();
771 __asm__ __volatile__("mov %0, %%sp"
772 : : "r" (orig_sp));
773 }
774
775 local_irq_restore(flags);
776 }
777
778 #ifdef CONFIG_HOTPLUG_CPU
779 void fixup_irqs(void)
780 {
781 unsigned int irq;
782
783 for (irq = 0; irq < NR_IRQS; irq++) {
784 unsigned long flags;
785
786 spin_lock_irqsave(&irq_desc[irq].lock, flags);
787 if (irq_desc[irq].action &&
788 !(irq_desc[irq].status & IRQ_PER_CPU)) {
789 if (irq_desc[irq].chip->set_affinity)
790 irq_desc[irq].chip->set_affinity(irq,
791 irq_desc[irq].affinity);
792 }
793 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
794 }
795
796 tick_ops->disable_irq();
797 }
798 #endif
799
800 struct sun5_timer {
801 u64 count0;
802 u64 limit0;
803 u64 count1;
804 u64 limit1;
805 };
806
807 static struct sun5_timer *prom_timers;
808 static u64 prom_limit0, prom_limit1;
809
810 static void map_prom_timers(void)
811 {
812 struct device_node *dp;
813 const unsigned int *addr;
814
815 /* PROM timer node hangs out in the top level of device siblings... */
816 dp = of_find_node_by_path("/");
817 dp = dp->child;
818 while (dp) {
819 if (!strcmp(dp->name, "counter-timer"))
820 break;
821 dp = dp->sibling;
822 }
823
824 /* Assume if node is not present, PROM uses different tick mechanism
825 * which we should not care about.
826 */
827 if (!dp) {
828 prom_timers = (struct sun5_timer *) 0;
829 return;
830 }
831
832 /* If PROM is really using this, it must be mapped by him. */
833 addr = of_get_property(dp, "address", NULL);
834 if (!addr) {
835 prom_printf("PROM does not have timer mapped, trying to continue.\n");
836 prom_timers = (struct sun5_timer *) 0;
837 return;
838 }
839 prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
840 }
841
842 static void kill_prom_timer(void)
843 {
844 if (!prom_timers)
845 return;
846
847 /* Save them away for later. */
848 prom_limit0 = prom_timers->limit0;
849 prom_limit1 = prom_timers->limit1;
850
851 /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
852 * We turn both off here just to be paranoid.
853 */
854 prom_timers->limit0 = 0;
855 prom_timers->limit1 = 0;
856
857 /* Wheee, eat the interrupt packet too... */
858 __asm__ __volatile__(
859 " mov 0x40, %%g2\n"
860 " ldxa [%%g0] %0, %%g1\n"
861 " ldxa [%%g2] %1, %%g1\n"
862 " stxa %%g0, [%%g0] %0\n"
863 " membar #Sync\n"
864 : /* no outputs */
865 : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
866 : "g1", "g2");
867 }
868
869 void init_irqwork_curcpu(void)
870 {
871 int cpu = hard_smp_processor_id();
872
873 trap_block[cpu].irq_worklist_pa = 0UL;
874 }
875
876 /* Please be very careful with register_one_mondo() and
877 * sun4v_register_mondo_queues().
878 *
879 * On SMP this gets invoked from the CPU trampoline before
880 * the cpu has fully taken over the trap table from OBP,
881 * and it's kernel stack + %g6 thread register state is
882 * not fully cooked yet.
883 *
884 * Therefore you cannot make any OBP calls, not even prom_printf,
885 * from these two routines.
886 */
887 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)
888 {
889 unsigned long num_entries = (qmask + 1) / 64;
890 unsigned long status;
891
892 status = sun4v_cpu_qconf(type, paddr, num_entries);
893 if (status != HV_EOK) {
894 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
895 "err %lu\n", type, paddr, num_entries, status);
896 prom_halt();
897 }
898 }
899
900 void __cpuinit sun4v_register_mondo_queues(int this_cpu)
901 {
902 struct trap_per_cpu *tb = &trap_block[this_cpu];
903
904 register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
905 tb->cpu_mondo_qmask);
906 register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
907 tb->dev_mondo_qmask);
908 register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
909 tb->resum_qmask);
910 register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
911 tb->nonresum_qmask);
912 }
913
914 static void __init alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask)
915 {
916 unsigned long size = PAGE_ALIGN(qmask + 1);
917 void *p = __alloc_bootmem(size, size, 0);
918 if (!p) {
919 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
920 prom_halt();
921 }
922
923 *pa_ptr = __pa(p);
924 }
925
926 static void __init alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask)
927 {
928 unsigned long size = PAGE_ALIGN(qmask + 1);
929 void *p = __alloc_bootmem(size, size, 0);
930
931 if (!p) {
932 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
933 prom_halt();
934 }
935
936 *pa_ptr = __pa(p);
937 }
938
939 static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
940 {
941 #ifdef CONFIG_SMP
942 void *page;
943
944 BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
945
946 page = alloc_bootmem_pages(PAGE_SIZE);
947 if (!page) {
948 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
949 prom_halt();
950 }
951
952 tb->cpu_mondo_block_pa = __pa(page);
953 tb->cpu_list_pa = __pa(page + 64);
954 #endif
955 }
956
957 /* Allocate mondo and error queues for all possible cpus. */
958 static void __init sun4v_init_mondo_queues(void)
959 {
960 int cpu;
961
962 for_each_possible_cpu(cpu) {
963 struct trap_per_cpu *tb = &trap_block[cpu];
964
965 alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
966 alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
967 alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask);
968 alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask);
969 alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
970 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa,
971 tb->nonresum_qmask);
972 }
973 }
974
975 static void __init init_send_mondo_info(void)
976 {
977 int cpu;
978
979 for_each_possible_cpu(cpu) {
980 struct trap_per_cpu *tb = &trap_block[cpu];
981
982 init_cpu_send_mondo_info(tb);
983 }
984 }
985
986 static struct irqaction timer_irq_action = {
987 .name = "timer",
988 };
989
990 /* Only invoked on boot processor. */
991 void __init init_IRQ(void)
992 {
993 unsigned long size;
994
995 map_prom_timers();
996 kill_prom_timer();
997
998 size = sizeof(struct ino_bucket) * NUM_IVECS;
999 ivector_table = alloc_bootmem(size);
1000 if (!ivector_table) {
1001 prom_printf("Fatal error, cannot allocate ivector_table\n");
1002 prom_halt();
1003 }
1004 __flush_dcache_range((unsigned long) ivector_table,
1005 ((unsigned long) ivector_table) + size);
1006
1007 ivector_table_pa = __pa(ivector_table);
1008
1009 if (tlb_type == hypervisor)
1010 sun4v_init_mondo_queues();
1011
1012 init_send_mondo_info();
1013
1014 if (tlb_type == hypervisor) {
1015 /* Load up the boot cpu's entries. */
1016 sun4v_register_mondo_queues(hard_smp_processor_id());
1017 }
1018
1019 /* We need to clear any IRQ's pending in the soft interrupt
1020 * registers, a spurious one could be left around from the
1021 * PROM timer which we just disabled.
1022 */
1023 clear_softint(get_softint());
1024
1025 /* Now that ivector table is initialized, it is safe
1026 * to receive IRQ vector traps. We will normally take
1027 * one or two right now, in case some device PROM used
1028 * to boot us wants to speak to us. We just ignore them.
1029 */
1030 __asm__ __volatile__("rdpr %%pstate, %%g1\n\t"
1031 "or %%g1, %0, %%g1\n\t"
1032 "wrpr %%g1, 0x0, %%pstate"
1033 : /* No outputs */
1034 : "i" (PSTATE_IE)
1035 : "g1");
1036
1037 irq_desc[0].action = &timer_irq_action;
1038 }
Linux kernel - Deliverables
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