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 
57 struct 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 
76 struct 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 
85 static 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 
94 static 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 
115 static 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 
136 static 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 
150 static 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 
168 static 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 
205 fail_set:
206 	irq_dispose_mapping(*virq);
207 fail_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 
218 static 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 
242 int 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 
271 fail_connect:
272 	ps3_virq_destroy(*virq);
273 fail_setup:
274 	return result;
275 }
276 EXPORT_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 
287 int 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 }
307 EXPORT_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 
320 int 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 }
339 EXPORT_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 
350 int 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 
373 int 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 
389 int 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 }
418 EXPORT_SYMBOL(ps3_sb_event_receive_port_setup);
419 
420 int 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 }
452 EXPORT_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 
465 int 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 }
484 EXPORT_SYMBOL_GPL(ps3_io_irq_setup);
485 
486 int 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 }
509 EXPORT_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 
522 int 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 }
546 EXPORT_SYMBOL_GPL(ps3_vuart_irq_setup);
547 
548 int 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 }
566 EXPORT_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 
578 int 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 
600 int 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)
617 static 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 
626 static 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__)
634 static 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__)
645 static 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
655 static void dump_bmp(struct ps3_private* pd) {};
656 #endif /* defined(DEBUG) */
657 
658 static 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 
669 static 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 
676 static const struct irq_domain_ops ps3_host_ops = {
677 	.map = ps3_host_map,
678 	.match = ps3_host_match,
679 };
680 
681 void __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 
691 void __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 
701 static 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 
739 void __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 
771 void 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 }
783