/arch/powerpc/platforms/ps3/interrupt.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *  PS3 interrupt routines.
  4 *
  5 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
  6 *  Copyright 2006 Sony Corp.
  7 */
  8
  9#include <linux/kernel.h>
 10#include <linux/export.h>
 11#include <linux/irq.h>
 12
 13#include <asm/machdep.h>
 14#include <asm/udbg.h>
 15#include <asm/lv1call.h>
 16#include <asm/smp.h>
 17
 18#include "platform.h"
 19
 20#if defined(DEBUG)
 21#define DBG udbg_printf
 22#define FAIL udbg_printf
 23#else
 24#define DBG pr_devel
 25#define FAIL pr_debug
 26#endif
 27
 28/**
 29 * struct ps3_bmp - a per cpu irq status and mask bitmap structure
 30 * @status: 256 bit status bitmap indexed by plug
 31 * @unused_1: Alignment
 32 * @mask: 256 bit mask bitmap indexed by plug
 33 * @unused_2: Alignment
 34 *
 35 * The HV maintains per SMT thread mappings of HV outlet to HV plug on
 36 * behalf of the guest.  These mappings are implemented as 256 bit guest
 37 * supplied bitmaps indexed by plug number.  The addresses of the bitmaps
 38 * are registered with the HV through lv1_configure_irq_state_bitmap().
 39 * The HV requires that the 512 bits of status + mask not cross a page
 40 * boundary.  PS3_BMP_MINALIGN is used to define this minimal 64 byte
 41 * alignment.
 42 *
 43 * The HV supports 256 plugs per thread, assigned as {0..255}, for a total
 44 * of 512 plugs supported on a processor.  To simplify the logic this
 45 * implementation equates HV plug value to Linux virq value, constrains each
 46 * interrupt to have a system wide unique plug number, and limits the range
 47 * of the plug values to map into the first dword of the bitmaps.  This
 48 * gives a usable range of plug values of  {NUM_ISA_INTERRUPTS..63}.  Note
 49 * that there is no constraint on how many in this set an individual thread
 50 * can acquire.
 51 *
 52 * The mask is declared as unsigned long so we can use set/clear_bit on it.
 53 */
 54
 55#define PS3_BMP_MINALIGN 64
 56
 57struct ps3_bmp {
 58	struct {
 59		u64 status;
 60		u64 unused_1[3];
 61		unsigned long mask;
 62		u64 unused_2[3];
 63	};
 64};
 65
 66/**
 67 * struct ps3_private - a per cpu data structure
 68 * @bmp: ps3_bmp structure
 69 * @bmp_lock: Synchronize access to bmp.
 70 * @ipi_debug_brk_mask: Mask for debug break IPIs
 71 * @ppe_id: HV logical_ppe_id
 72 * @thread_id: HV thread_id
 73 * @ipi_mask: Mask of IPI virqs
 74 */
 75
 76struct ps3_private {
 77	struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
 78	spinlock_t bmp_lock;
 79	u64 ppe_id;
 80	u64 thread_id;
 81	unsigned long ipi_debug_brk_mask;
 82	unsigned long ipi_mask;
 83};
 84
 85static DEFINE_PER_CPU(struct ps3_private, ps3_private);
 86
 87/**
 88 * ps3_chip_mask - Set an interrupt mask bit in ps3_bmp.
 89 * @virq: The assigned Linux virq.
 90 *
 91 * Sets ps3_bmp.mask and calls lv1_did_update_interrupt_mask().
 92 */
 93
 94static void ps3_chip_mask(struct irq_data *d)
 95{
 96	struct ps3_private *pd = irq_data_get_irq_chip_data(d);
 97	unsigned long flags;
 98
 99	DBG("%s:%d: thread_id %llu, virq %d\n", __func__, __LINE__,
100		pd->thread_id, d->irq);
101
102	local_irq_save(flags);
103	clear_bit(63 - d->irq, &pd->bmp.mask);
104	lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
105	local_irq_restore(flags);
106}
107
108/**
109 * ps3_chip_unmask - Clear an interrupt mask bit in ps3_bmp.
110 * @virq: The assigned Linux virq.
111 *
112 * Clears ps3_bmp.mask and calls lv1_did_update_interrupt_mask().
113 */
114
115static void ps3_chip_unmask(struct irq_data *d)
116{
117	struct ps3_private *pd = irq_data_get_irq_chip_data(d);
118	unsigned long flags;
119
120	DBG("%s:%d: thread_id %llu, virq %d\n", __func__, __LINE__,
121		pd->thread_id, d->irq);
122
123	local_irq_save(flags);
124	set_bit(63 - d->irq, &pd->bmp.mask);
125	lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
126	local_irq_restore(flags);
127}
128
129/**
130 * ps3_chip_eoi - HV end-of-interrupt.
131 * @virq: The assigned Linux virq.
132 *
133 * Calls lv1_end_of_interrupt_ext().
134 */
135
136static void ps3_chip_eoi(struct irq_data *d)
137{
138	const struct ps3_private *pd = irq_data_get_irq_chip_data(d);
139
140	/* non-IPIs are EOIed here. */
141
142	if (!test_bit(63 - d->irq, &pd->ipi_mask))
143		lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, d->irq);
144}
145
146/**
147 * ps3_irq_chip - Represents the ps3_bmp as a Linux struct irq_chip.
148 */
149
150static struct irq_chip ps3_irq_chip = {
151	.name = "ps3",
152	.irq_mask = ps3_chip_mask,
153	.irq_unmask = ps3_chip_unmask,
154	.irq_eoi = ps3_chip_eoi,
155};
156
157/**
158 * ps3_virq_setup - virq related setup.
159 * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
160 * serviced on.
161 * @outlet: The HV outlet from the various create outlet routines.
162 * @virq: The assigned Linux virq.
163 *
164 * Calls irq_create_mapping() to get a virq and sets the chip data to
165 * ps3_private data.
166 */
167
168static int ps3_virq_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
169			  unsigned int *virq)
170{
171	int result;
172	struct ps3_private *pd;
173
174	/* This defines the default interrupt distribution policy. */
175
176	if (cpu == PS3_BINDING_CPU_ANY)
177		cpu = 0;
178
179	pd = &per_cpu(ps3_private, cpu);
180
181	*virq = irq_create_mapping(NULL, outlet);
182
183	if (!*virq) {
184		FAIL("%s:%d: irq_create_mapping failed: outlet %lu\n",
185			__func__, __LINE__, outlet);
186		result = -ENOMEM;
187		goto fail_create;
188	}
189
190	DBG("%s:%d: outlet %lu => cpu %u, virq %u\n", __func__, __LINE__,
191		outlet, cpu, *virq);
192
193	result = irq_set_chip_data(*virq, pd);
194
195	if (result) {
196		FAIL("%s:%d: irq_set_chip_data failed\n",
197			__func__, __LINE__);
198		goto fail_set;
199	}
200
201	ps3_chip_mask(irq_get_irq_data(*virq));
202
203	return result;
204
205fail_set:
206	irq_dispose_mapping(*virq);
207fail_create:
208	return result;
209}
210
211/**
212 * ps3_virq_destroy - virq related teardown.
213 * @virq: The assigned Linux virq.
214 *
215 * Clears chip data and calls irq_dispose_mapping() for the virq.
216 */
217
218static int ps3_virq_destroy(unsigned int virq)
219{
220	const struct ps3_private *pd = irq_get_chip_data(virq);
221
222	DBG("%s:%d: ppe_id %llu, thread_id %llu, virq %u\n", __func__,
223		__LINE__, pd->ppe_id, pd->thread_id, virq);
224
225	irq_set_chip_data(virq, NULL);
226	irq_dispose_mapping(virq);
227
228	DBG("%s:%d <-\n", __func__, __LINE__);
229	return 0;
230}
231
232/**
233 * ps3_irq_plug_setup - Generic outlet and virq related setup.
234 * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
235 * serviced on.
236 * @outlet: The HV outlet from the various create outlet routines.
237 * @virq: The assigned Linux virq.
238 *
239 * Sets up virq and connects the irq plug.
240 */
241
242int ps3_irq_plug_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
243	unsigned int *virq)
244{
245	int result;
246	struct ps3_private *pd;
247
248	result = ps3_virq_setup(cpu, outlet, virq);
249
250	if (result) {
251		FAIL("%s:%d: ps3_virq_setup failed\n", __func__, __LINE__);
252		goto fail_setup;
253	}
254
255	pd = irq_get_chip_data(*virq);
256
257	/* Binds outlet to cpu + virq. */
258
259	result = lv1_connect_irq_plug_ext(pd->ppe_id, pd->thread_id, *virq,
260		outlet, 0);
261
262	if (result) {
263		FAIL("%s:%d: lv1_connect_irq_plug_ext failed: %s\n",
264		__func__, __LINE__, ps3_result(result));
265		result = -EPERM;
266		goto fail_connect;
267	}
268
269	return result;
270
271fail_connect:
272	ps3_virq_destroy(*virq);
273fail_setup:
274	return result;
275}
276EXPORT_SYMBOL_GPL(ps3_irq_plug_setup);
277
278/**
279 * ps3_irq_plug_destroy - Generic outlet and virq related teardown.
280 * @virq: The assigned Linux virq.
281 *
282 * Disconnects the irq plug and tears down virq.
283 * Do not call for system bus event interrupts setup with
284 * ps3_sb_event_receive_port_setup().
285 */
286
287int ps3_irq_plug_destroy(unsigned int virq)
288{
289	int result;
290	const struct ps3_private *pd = irq_get_chip_data(virq);
291
292	DBG("%s:%d: ppe_id %llu, thread_id %llu, virq %u\n", __func__,
293		__LINE__, pd->ppe_id, pd->thread_id, virq);
294
295	ps3_chip_mask(irq_get_irq_data(virq));
296
297	result = lv1_disconnect_irq_plug_ext(pd->ppe_id, pd->thread_id, virq);
298
299	if (result)
300		FAIL("%s:%d: lv1_disconnect_irq_plug_ext failed: %s\n",
301		__func__, __LINE__, ps3_result(result));
302
303	ps3_virq_destroy(virq);
304
305	return result;
306}
307EXPORT_SYMBOL_GPL(ps3_irq_plug_destroy);
308
309/**
310 * ps3_event_receive_port_setup - Setup an event receive port.
311 * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
312 * serviced on.
313 * @virq: The assigned Linux virq.
314 *
315 * The virq can be used with lv1_connect_interrupt_event_receive_port() to
316 * arrange to receive interrupts from system-bus devices, or with
317 * ps3_send_event_locally() to signal events.
318 */
319
320int ps3_event_receive_port_setup(enum ps3_cpu_binding cpu, unsigned int *virq)
321{
322	int result;
323	u64 outlet;
324
325	result = lv1_construct_event_receive_port(&outlet);
326
327	if (result) {
328		FAIL("%s:%d: lv1_construct_event_receive_port failed: %s\n",
329			__func__, __LINE__, ps3_result(result));
330		*virq = 0;
331		return result;
332	}
333
334	result = ps3_irq_plug_setup(cpu, outlet, virq);
335	BUG_ON(result);
336
337	return result;
338}
339EXPORT_SYMBOL_GPL(ps3_event_receive_port_setup);
340
341/**
342 * ps3_event_receive_port_destroy - Destroy an event receive port.
343 * @virq: The assigned Linux virq.
344 *
345 * Since ps3_event_receive_port_destroy destroys the receive port outlet,
346 * SB devices need to call disconnect_interrupt_event_receive_port() before
347 * this.
348 */
349
350int ps3_event_receive_port_destroy(unsigned int virq)
351{
352	int result;
353
354	DBG(" -> %s:%d virq %u\n", __func__, __LINE__, virq);
355
356	ps3_chip_mask(irq_get_irq_data(virq));
357
358	result = lv1_destruct_event_receive_port(virq_to_hw(virq));
359
360	if (result)
361		FAIL("%s:%d: lv1_destruct_event_receive_port failed: %s\n",
362			__func__, __LINE__, ps3_result(result));
363
364	/*
365	 * Don't call ps3_virq_destroy() here since ps3_smp_cleanup_cpu()
366	 * calls from interrupt context (smp_call_function) when kexecing.
367	 */
368
369	DBG(" <- %s:%d\n", __func__, __LINE__);
370	return result;
371}
372
373int ps3_send_event_locally(unsigned int virq)
374{
375	return lv1_send_event_locally(virq_to_hw(virq));
376}
377
378/**
379 * ps3_sb_event_receive_port_setup - Setup a system bus event receive port.
380 * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
381 * serviced on.
382 * @dev: The system bus device instance.
383 * @virq: The assigned Linux virq.
384 *
385 * An event irq represents a virtual device interrupt.  The interrupt_id
386 * coresponds to the software interrupt number.
387 */
388
389int ps3_sb_event_receive_port_setup(struct ps3_system_bus_device *dev,
390	enum ps3_cpu_binding cpu, unsigned int *virq)
391{
392	/* this should go in system-bus.c */
393
394	int result;
395
396	result = ps3_event_receive_port_setup(cpu, virq);
397
398	if (result)
399		return result;
400
401	result = lv1_connect_interrupt_event_receive_port(dev->bus_id,
402		dev->dev_id, virq_to_hw(*virq), dev->interrupt_id);
403
404	if (result) {
405		FAIL("%s:%d: lv1_connect_interrupt_event_receive_port"
406			" failed: %s\n", __func__, __LINE__,
407			ps3_result(result));
408		ps3_event_receive_port_destroy(*virq);
409		*virq = 0;
410		return result;
411	}
412
413	DBG("%s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
414		dev->interrupt_id, *virq);
415
416	return 0;
417}
418EXPORT_SYMBOL(ps3_sb_event_receive_port_setup);
419
420int ps3_sb_event_receive_port_destroy(struct ps3_system_bus_device *dev,
421	unsigned int virq)
422{
423	/* this should go in system-bus.c */
424
425	int result;
426
427	DBG(" -> %s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
428		dev->interrupt_id, virq);
429
430	result = lv1_disconnect_interrupt_event_receive_port(dev->bus_id,
431		dev->dev_id, virq_to_hw(virq), dev->interrupt_id);
432
433	if (result)
434		FAIL("%s:%d: lv1_disconnect_interrupt_event_receive_port"
435			" failed: %s\n", __func__, __LINE__,
436			ps3_result(result));
437
438	result = ps3_event_receive_port_destroy(virq);
439	BUG_ON(result);
440
441	/*
442	 * ps3_event_receive_port_destroy() destroys the IRQ plug,
443	 * so don't call ps3_irq_plug_destroy() here.
444	 */
445
446	result = ps3_virq_destroy(virq);
447	BUG_ON(result);
448
449	DBG(" <- %s:%d\n", __func__, __LINE__);
450	return result;
451}
452EXPORT_SYMBOL(ps3_sb_event_receive_port_destroy);
453
454/**
455 * ps3_io_irq_setup - Setup a system bus io irq.
456 * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
457 * serviced on.
458 * @interrupt_id: The device interrupt id read from the system repository.
459 * @virq: The assigned Linux virq.
460 *
461 * An io irq represents a non-virtualized device interrupt.  interrupt_id
462 * coresponds to the interrupt number of the interrupt controller.
463 */
464
465int ps3_io_irq_setup(enum ps3_cpu_binding cpu, unsigned int interrupt_id,
466	unsigned int *virq)
467{
468	int result;
469	u64 outlet;
470
471	result = lv1_construct_io_irq_outlet(interrupt_id, &outlet);
472
473	if (result) {
474		FAIL("%s:%d: lv1_construct_io_irq_outlet failed: %s\n",
475			__func__, __LINE__, ps3_result(result));
476		return result;
477	}
478
479	result = ps3_irq_plug_setup(cpu, outlet, virq);
480	BUG_ON(result);
481
482	return result;
483}
484EXPORT_SYMBOL_GPL(ps3_io_irq_setup);
485
486int ps3_io_irq_destroy(unsigned int virq)
487{
488	int result;
489	unsigned long outlet = virq_to_hw(virq);
490
491	ps3_chip_mask(irq_get_irq_data(virq));
492
493	/*
494	 * lv1_destruct_io_irq_outlet() will destroy the IRQ plug,
495	 * so call ps3_irq_plug_destroy() first.
496	 */
497
498	result = ps3_irq_plug_destroy(virq);
499	BUG_ON(result);
500
501	result = lv1_destruct_io_irq_outlet(outlet);
502
503	if (result)
504		FAIL("%s:%d: lv1_destruct_io_irq_outlet failed: %s\n",
505			__func__, __LINE__, ps3_result(result));
506
507	return result;
508}
509EXPORT_SYMBOL_GPL(ps3_io_irq_destroy);
510
511/**
512 * ps3_vuart_irq_setup - Setup the system virtual uart virq.
513 * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
514 * serviced on.
515 * @virt_addr_bmp: The caller supplied virtual uart interrupt bitmap.
516 * @virq: The assigned Linux virq.
517 *
518 * The system supports only a single virtual uart, so multiple calls without
519 * freeing the interrupt will return a wrong state error.
520 */
521
522int ps3_vuart_irq_setup(enum ps3_cpu_binding cpu, void* virt_addr_bmp,
523	unsigned int *virq)
524{
525	int result;
526	u64 outlet;
527	u64 lpar_addr;
528
529	BUG_ON(!is_kernel_addr((u64)virt_addr_bmp));
530
531	lpar_addr = ps3_mm_phys_to_lpar(__pa(virt_addr_bmp));
532
533	result = lv1_configure_virtual_uart_irq(lpar_addr, &outlet);
534
535	if (result) {
536		FAIL("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
537			__func__, __LINE__, ps3_result(result));
538		return result;
539	}
540
541	result = ps3_irq_plug_setup(cpu, outlet, virq);
542	BUG_ON(result);
543
544	return result;
545}
546EXPORT_SYMBOL_GPL(ps3_vuart_irq_setup);
547
548int ps3_vuart_irq_destroy(unsigned int virq)
549{
550	int result;
551
552	ps3_chip_mask(irq_get_irq_data(virq));
553	result = lv1_deconfigure_virtual_uart_irq();
554
555	if (result) {
556		FAIL("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
557			__func__, __LINE__, ps3_result(result));
558		return result;
559	}
560
561	result = ps3_irq_plug_destroy(virq);
562	BUG_ON(result);
563
564	return result;
565}
566EXPORT_SYMBOL_GPL(ps3_vuart_irq_destroy);
567
568/**
569 * ps3_spe_irq_setup - Setup an spe virq.
570 * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
571 * serviced on.
572 * @spe_id: The spe_id returned from lv1_construct_logical_spe().
573 * @class: The spe interrupt class {0,1,2}.
574 * @virq: The assigned Linux virq.
575 *
576 */
577
578int ps3_spe_irq_setup(enum ps3_cpu_binding cpu, unsigned long spe_id,
579	unsigned int class, unsigned int *virq)
580{
581	int result;
582	u64 outlet;
583
584	BUG_ON(class > 2);
585
586	result = lv1_get_spe_irq_outlet(spe_id, class, &outlet);
587
588	if (result) {
589		FAIL("%s:%d: lv1_get_spe_irq_outlet failed: %s\n",
590			__func__, __LINE__, ps3_result(result));
591		return result;
592	}
593
594	result = ps3_irq_plug_setup(cpu, outlet, virq);
595	BUG_ON(result);
596
597	return result;
598}
599
600int ps3_spe_irq_destroy(unsigned int virq)
601{
602	int result;
603
604	ps3_chip_mask(irq_get_irq_data(virq));
605
606	result = ps3_irq_plug_destroy(virq);
607	BUG_ON(result);
608
609	return result;
610}
611
612
613#define PS3_INVALID_OUTLET ((irq_hw_number_t)-1)
614#define PS3_PLUG_MAX 63
615
616#if defined(DEBUG)
617static void _dump_64_bmp(const char *header, const u64 *p, unsigned cpu,
618	const char* func, int line)
619{
620	pr_debug("%s:%d: %s %u {%04llx_%04llx_%04llx_%04llx}\n",
621		func, line, header, cpu,
622		*p >> 48, (*p >> 32) & 0xffff, (*p >> 16) & 0xffff,
623		*p & 0xffff);
624}
625
626static void __maybe_unused _dump_256_bmp(const char *header,
627	const u64 *p, unsigned cpu, const char* func, int line)
628{
629	pr_debug("%s:%d: %s %u {%016llx:%016llx:%016llx:%016llx}\n",
630		func, line, header, cpu, p[0], p[1], p[2], p[3]);
631}
632
633#define dump_bmp(_x) _dump_bmp(_x, __func__, __LINE__)
634static void _dump_bmp(struct ps3_private* pd, const char* func, int line)
635{
636	unsigned long flags;
637
638	spin_lock_irqsave(&pd->bmp_lock, flags);
639	_dump_64_bmp("stat", &pd->bmp.status, pd->thread_id, func, line);
640	_dump_64_bmp("mask", (u64*)&pd->bmp.mask, pd->thread_id, func, line);
641	spin_unlock_irqrestore(&pd->bmp_lock, flags);
642}
643
644#define dump_mask(_x) _dump_mask(_x, __func__, __LINE__)
645static void __maybe_unused _dump_mask(struct ps3_private *pd,
646	const char* func, int line)
647{
648	unsigned long flags;
649
650	spin_lock_irqsave(&pd->bmp_lock, flags);
651	_dump_64_bmp("mask", (u64*)&pd->bmp.mask, pd->thread_id, func, line);
652	spin_unlock_irqrestore(&pd->bmp_lock, flags);
653}
654#else
655static void dump_bmp(struct ps3_private* pd) {};
656#endif /* defined(DEBUG) */
657
658static int ps3_host_map(struct irq_domain *h, unsigned int virq,
659	irq_hw_number_t hwirq)
660{
661	DBG("%s:%d: hwirq %lu, virq %u\n", __func__, __LINE__, hwirq,
662		virq);
663
664	irq_set_chip_and_handler(virq, &ps3_irq_chip, handle_fasteoi_irq);
665
666	return 0;
667}
668
669static int ps3_host_match(struct irq_domain *h, struct device_node *np,
670			  enum irq_domain_bus_token bus_token)
671{
672	/* Match all */
673	return 1;
674}
675
676static const struct irq_domain_ops ps3_host_ops = {
677	.map = ps3_host_map,
678	.match = ps3_host_match,
679};
680
681void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq)
682{
683	struct ps3_private *pd = &per_cpu(ps3_private, cpu);
684
685	set_bit(63 - virq, &pd->ipi_debug_brk_mask);
686
687	DBG("%s:%d: cpu %u, virq %u, mask %lxh\n", __func__, __LINE__,
688		cpu, virq, pd->ipi_debug_brk_mask);
689}
690
691void __init ps3_register_ipi_irq(unsigned int cpu, unsigned int virq)
692{
693	struct ps3_private *pd = &per_cpu(ps3_private, cpu);
694
695	set_bit(63 - virq, &pd->ipi_mask);
696
697	DBG("%s:%d: cpu %u, virq %u, ipi_mask %lxh\n", __func__, __LINE__,
698		cpu, virq, pd->ipi_mask);
699}
700
701static unsigned int ps3_get_irq(void)
702{
703	struct ps3_private *pd = this_cpu_ptr(&ps3_private);
704	u64 x = (pd->bmp.status & pd->bmp.mask);
705	unsigned int plug;
706
707	/* check for ipi break first to stop this cpu ASAP */
708
709	if (x & pd->ipi_debug_brk_mask)
710		x &= pd->ipi_debug_brk_mask;
711
712	asm volatile("cntlzd %0,%1" : "=r" (plug) : "r" (x));
713	plug &= 0x3f;
714
715	if (unlikely(!plug)) {
716		DBG("%s:%d: no plug found: thread_id %llu\n", __func__,
717			__LINE__, pd->thread_id);
718		dump_bmp(&per_cpu(ps3_private, 0));
719		dump_bmp(&per_cpu(ps3_private, 1));
720		return 0;
721	}
722
723#if defined(DEBUG)
724	if (unlikely(plug < NUM_ISA_INTERRUPTS || plug > PS3_PLUG_MAX)) {
725		dump_bmp(&per_cpu(ps3_private, 0));
726		dump_bmp(&per_cpu(ps3_private, 1));
727		BUG();
728	}
729#endif
730
731	/* IPIs are EOIed here. */
732
733	if (test_bit(63 - plug, &pd->ipi_mask))
734		lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, plug);
735
736	return plug;
737}
738
739void __init ps3_init_IRQ(void)
740{
741	int result;
742	unsigned cpu;
743	struct irq_domain *host;
744
745	host = irq_domain_add_nomap(NULL, PS3_PLUG_MAX + 1, &ps3_host_ops, NULL);
746	irq_set_default_host(host);
747
748	for_each_possible_cpu(cpu) {
749		struct ps3_private *pd = &per_cpu(ps3_private, cpu);
750
751		lv1_get_logical_ppe_id(&pd->ppe_id);
752		pd->thread_id = get_hard_smp_processor_id(cpu);
753		spin_lock_init(&pd->bmp_lock);
754
755		DBG("%s:%d: ppe_id %llu, thread_id %llu, bmp %lxh\n",
756			__func__, __LINE__, pd->ppe_id, pd->thread_id,
757			ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
758
759		result = lv1_configure_irq_state_bitmap(pd->ppe_id,
760			pd->thread_id, ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
761
762		if (result)
763			FAIL("%s:%d: lv1_configure_irq_state_bitmap failed:"
764				" %s\n", __func__, __LINE__,
765				ps3_result(result));
766	}
767
768	ppc_md.get_irq = ps3_get_irq;
769}
770
771void ps3_shutdown_IRQ(int cpu)
772{
773	int result;
774	u64 ppe_id;
775	u64 thread_id = get_hard_smp_processor_id(cpu);
776
777	lv1_get_logical_ppe_id(&ppe_id);
778	result = lv1_configure_irq_state_bitmap(ppe_id, thread_id, 0);
779
780	DBG("%s:%d: lv1_configure_irq_state_bitmap (%llu:%llu/%d) %s\n", __func__,
781		__LINE__, ppe_id, thread_id, cpu, ps3_result(result));
782}