1 /*
2  *  PS3 interrupt routines.
3  *
4  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
5  *  Copyright 2006 Sony Corp.
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; version 2 of the License.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  */
20 
21 #include <linux/kernel.h>
22 #include <linux/export.h>
23 #include <linux/irq.h>
24 
25 #include <asm/machdep.h>
26 #include <asm/udbg.h>
27 #include <asm/lv1call.h>
28 #include <asm/smp.h>
29 
30 #include "platform.h"
31 
32 #if defined(DEBUG)
33 #define DBG udbg_printf
34 #define FAIL udbg_printf
35 #else
36 #define DBG pr_devel
37 #define FAIL pr_debug
38 #endif
39 
40 /**
41  * struct ps3_bmp - a per cpu irq status and mask bitmap structure
42  * @status: 256 bit status bitmap indexed by plug
43  * @unused_1: Alignment
44  * @mask: 256 bit mask bitmap indexed by plug
45  * @unused_2: Alignment
46  *
47  * The HV maintains per SMT thread mappings of HV outlet to HV plug on
48  * behalf of the guest.  These mappings are implemented as 256 bit guest
49  * supplied bitmaps indexed by plug number.  The addresses of the bitmaps
50  * are registered with the HV through lv1_configure_irq_state_bitmap().
51  * The HV requires that the 512 bits of status + mask not cross a page
52  * boundary.  PS3_BMP_MINALIGN is used to define this minimal 64 byte
53  * alignment.
54  *
55  * The HV supports 256 plugs per thread, assigned as {0..255}, for a total
56  * of 512 plugs supported on a processor.  To simplify the logic this
57  * implementation equates HV plug value to Linux virq value, constrains each
58  * interrupt to have a system wide unique plug number, and limits the range
59  * of the plug values to map into the first dword of the bitmaps.  This
60  * gives a usable range of plug values of  {NUM_ISA_INTERRUPTS..63}.  Note
61  * that there is no constraint on how many in this set an individual thread
62  * can acquire.
63  *
64  * The mask is declared as unsigned long so we can use set/clear_bit on it.
65  */
66 
67 #define PS3_BMP_MINALIGN 64
68 
69 struct ps3_bmp {
70 	struct {
71 		u64 status;
72 		u64 unused_1[3];
73 		unsigned long mask;
74 		u64 unused_2[3];
75 	};
76 };
77 
78 /**
79  * struct ps3_private - a per cpu data structure
80  * @bmp: ps3_bmp structure
81  * @bmp_lock: Synchronize access to bmp.
82  * @ipi_debug_brk_mask: Mask for debug break IPIs
83  * @ppe_id: HV logical_ppe_id
84  * @thread_id: HV thread_id
85  * @ipi_mask: Mask of IPI virqs
86  */
87 
88 struct ps3_private {
89 	struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
90 	spinlock_t bmp_lock;
91 	u64 ppe_id;
92 	u64 thread_id;
93 	unsigned long ipi_debug_brk_mask;
94 	unsigned long ipi_mask;
95 };
96 
97 static DEFINE_PER_CPU(struct ps3_private, ps3_private);
98 
99 /**
100  * ps3_chip_mask - Set an interrupt mask bit in ps3_bmp.
101  * @virq: The assigned Linux virq.
102  *
103  * Sets ps3_bmp.mask and calls lv1_did_update_interrupt_mask().
104  */
105 
106 static void ps3_chip_mask(struct irq_data *d)
107 {
108 	struct ps3_private *pd = irq_data_get_irq_chip_data(d);
109 	unsigned long flags;
110 
111 	DBG("%s:%d: thread_id %llu, virq %d\n", __func__, __LINE__,
112 		pd->thread_id, d->irq);
113 
114 	local_irq_save(flags);
115 	clear_bit(63 - d->irq, &pd->bmp.mask);
116 	lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
117 	local_irq_restore(flags);
118 }
119 
120 /**
121  * ps3_chip_unmask - Clear an interrupt mask bit in ps3_bmp.
122  * @virq: The assigned Linux virq.
123  *
124  * Clears ps3_bmp.mask and calls lv1_did_update_interrupt_mask().
125  */
126 
127 static void ps3_chip_unmask(struct irq_data *d)
128 {
129 	struct ps3_private *pd = irq_data_get_irq_chip_data(d);
130 	unsigned long flags;
131 
132 	DBG("%s:%d: thread_id %llu, virq %d\n", __func__, __LINE__,
133 		pd->thread_id, d->irq);
134 
135 	local_irq_save(flags);
136 	set_bit(63 - d->irq, &pd->bmp.mask);
137 	lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
138 	local_irq_restore(flags);
139 }
140 
141 /**
142  * ps3_chip_eoi - HV end-of-interrupt.
143  * @virq: The assigned Linux virq.
144  *
145  * Calls lv1_end_of_interrupt_ext().
146  */
147 
148 static void ps3_chip_eoi(struct irq_data *d)
149 {
150 	const struct ps3_private *pd = irq_data_get_irq_chip_data(d);
151 
152 	/* non-IPIs are EOIed here. */
153 
154 	if (!test_bit(63 - d->irq, &pd->ipi_mask))
155 		lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, d->irq);
156 }
157 
158 /**
159  * ps3_irq_chip - Represents the ps3_bmp as a Linux struct irq_chip.
160  */
161 
162 static struct irq_chip ps3_irq_chip = {
163 	.name = "ps3",
164 	.irq_mask = ps3_chip_mask,
165 	.irq_unmask = ps3_chip_unmask,
166 	.irq_eoi = ps3_chip_eoi,
167 };
168 
169 /**
170  * ps3_virq_setup - virq related setup.
171  * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
172  * serviced on.
173  * @outlet: The HV outlet from the various create outlet routines.
174  * @virq: The assigned Linux virq.
175  *
176  * Calls irq_create_mapping() to get a virq and sets the chip data to
177  * ps3_private data.
178  */
179 
180 static int ps3_virq_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
181 			  unsigned int *virq)
182 {
183 	int result;
184 	struct ps3_private *pd;
185 
186 	/* This defines the default interrupt distribution policy. */
187 
188 	if (cpu == PS3_BINDING_CPU_ANY)
189 		cpu = 0;
190 
191 	pd = &per_cpu(ps3_private, cpu);
192 
193 	*virq = irq_create_mapping(NULL, outlet);
194 
195 	if (!*virq) {
196 		FAIL("%s:%d: irq_create_mapping failed: outlet %lu\n",
197 			__func__, __LINE__, outlet);
198 		result = -ENOMEM;
199 		goto fail_create;
200 	}
201 
202 	DBG("%s:%d: outlet %lu => cpu %u, virq %u\n", __func__, __LINE__,
203 		outlet, cpu, *virq);
204 
205 	result = irq_set_chip_data(*virq, pd);
206 
207 	if (result) {
208 		FAIL("%s:%d: irq_set_chip_data failed\n",
209 			__func__, __LINE__);
210 		goto fail_set;
211 	}
212 
213 	ps3_chip_mask(irq_get_irq_data(*virq));
214 
215 	return result;
216 
217 fail_set:
218 	irq_dispose_mapping(*virq);
219 fail_create:
220 	return result;
221 }
222 
223 /**
224  * ps3_virq_destroy - virq related teardown.
225  * @virq: The assigned Linux virq.
226  *
227  * Clears chip data and calls irq_dispose_mapping() for the virq.
228  */
229 
230 static int ps3_virq_destroy(unsigned int virq)
231 {
232 	const struct ps3_private *pd = irq_get_chip_data(virq);
233 
234 	DBG("%s:%d: ppe_id %llu, thread_id %llu, virq %u\n", __func__,
235 		__LINE__, pd->ppe_id, pd->thread_id, virq);
236 
237 	irq_set_chip_data(virq, NULL);
238 	irq_dispose_mapping(virq);
239 
240 	DBG("%s:%d <-\n", __func__, __LINE__);
241 	return 0;
242 }
243 
244 /**
245  * ps3_irq_plug_setup - Generic outlet and virq related setup.
246  * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
247  * serviced on.
248  * @outlet: The HV outlet from the various create outlet routines.
249  * @virq: The assigned Linux virq.
250  *
251  * Sets up virq and connects the irq plug.
252  */
253 
254 int ps3_irq_plug_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
255 	unsigned int *virq)
256 {
257 	int result;
258 	struct ps3_private *pd;
259 
260 	result = ps3_virq_setup(cpu, outlet, virq);
261 
262 	if (result) {
263 		FAIL("%s:%d: ps3_virq_setup failed\n", __func__, __LINE__);
264 		goto fail_setup;
265 	}
266 
267 	pd = irq_get_chip_data(*virq);
268 
269 	/* Binds outlet to cpu + virq. */
270 
271 	result = lv1_connect_irq_plug_ext(pd->ppe_id, pd->thread_id, *virq,
272 		outlet, 0);
273 
274 	if (result) {
275 		FAIL("%s:%d: lv1_connect_irq_plug_ext failed: %s\n",
276 		__func__, __LINE__, ps3_result(result));
277 		result = -EPERM;
278 		goto fail_connect;
279 	}
280 
281 	return result;
282 
283 fail_connect:
284 	ps3_virq_destroy(*virq);
285 fail_setup:
286 	return result;
287 }
288 EXPORT_SYMBOL_GPL(ps3_irq_plug_setup);
289 
290 /**
291  * ps3_irq_plug_destroy - Generic outlet and virq related teardown.
292  * @virq: The assigned Linux virq.
293  *
294  * Disconnects the irq plug and tears down virq.
295  * Do not call for system bus event interrupts setup with
296  * ps3_sb_event_receive_port_setup().
297  */
298 
299 int ps3_irq_plug_destroy(unsigned int virq)
300 {
301 	int result;
302 	const struct ps3_private *pd = irq_get_chip_data(virq);
303 
304 	DBG("%s:%d: ppe_id %llu, thread_id %llu, virq %u\n", __func__,
305 		__LINE__, pd->ppe_id, pd->thread_id, virq);
306 
307 	ps3_chip_mask(irq_get_irq_data(virq));
308 
309 	result = lv1_disconnect_irq_plug_ext(pd->ppe_id, pd->thread_id, virq);
310 
311 	if (result)
312 		FAIL("%s:%d: lv1_disconnect_irq_plug_ext failed: %s\n",
313 		__func__, __LINE__, ps3_result(result));
314 
315 	ps3_virq_destroy(virq);
316 
317 	return result;
318 }
319 EXPORT_SYMBOL_GPL(ps3_irq_plug_destroy);
320 
321 /**
322  * ps3_event_receive_port_setup - Setup an event receive port.
323  * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
324  * serviced on.
325  * @virq: The assigned Linux virq.
326  *
327  * The virq can be used with lv1_connect_interrupt_event_receive_port() to
328  * arrange to receive interrupts from system-bus devices, or with
329  * ps3_send_event_locally() to signal events.
330  */
331 
332 int ps3_event_receive_port_setup(enum ps3_cpu_binding cpu, unsigned int *virq)
333 {
334 	int result;
335 	u64 outlet;
336 
337 	result = lv1_construct_event_receive_port(&outlet);
338 
339 	if (result) {
340 		FAIL("%s:%d: lv1_construct_event_receive_port failed: %s\n",
341 			__func__, __LINE__, ps3_result(result));
342 		*virq = 0;
343 		return result;
344 	}
345 
346 	result = ps3_irq_plug_setup(cpu, outlet, virq);
347 	BUG_ON(result);
348 
349 	return result;
350 }
351 EXPORT_SYMBOL_GPL(ps3_event_receive_port_setup);
352 
353 /**
354  * ps3_event_receive_port_destroy - Destroy an event receive port.
355  * @virq: The assigned Linux virq.
356  *
357  * Since ps3_event_receive_port_destroy destroys the receive port outlet,
358  * SB devices need to call disconnect_interrupt_event_receive_port() before
359  * this.
360  */
361 
362 int ps3_event_receive_port_destroy(unsigned int virq)
363 {
364 	int result;
365 
366 	DBG(" -> %s:%d virq %u\n", __func__, __LINE__, virq);
367 
368 	ps3_chip_mask(irq_get_irq_data(virq));
369 
370 	result = lv1_destruct_event_receive_port(virq_to_hw(virq));
371 
372 	if (result)
373 		FAIL("%s:%d: lv1_destruct_event_receive_port failed: %s\n",
374 			__func__, __LINE__, ps3_result(result));
375 
376 	/*
377 	 * Don't call ps3_virq_destroy() here since ps3_smp_cleanup_cpu()
378 	 * calls from interrupt context (smp_call_function) when kexecing.
379 	 */
380 
381 	DBG(" <- %s:%d\n", __func__, __LINE__);
382 	return result;
383 }
384 
385 int ps3_send_event_locally(unsigned int virq)
386 {
387 	return lv1_send_event_locally(virq_to_hw(virq));
388 }
389 
390 /**
391  * ps3_sb_event_receive_port_setup - Setup a system bus event receive port.
392  * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
393  * serviced on.
394  * @dev: The system bus device instance.
395  * @virq: The assigned Linux virq.
396  *
397  * An event irq represents a virtual device interrupt.  The interrupt_id
398  * coresponds to the software interrupt number.
399  */
400 
401 int ps3_sb_event_receive_port_setup(struct ps3_system_bus_device *dev,
402 	enum ps3_cpu_binding cpu, unsigned int *virq)
403 {
404 	/* this should go in system-bus.c */
405 
406 	int result;
407 
408 	result = ps3_event_receive_port_setup(cpu, virq);
409 
410 	if (result)
411 		return result;
412 
413 	result = lv1_connect_interrupt_event_receive_port(dev->bus_id,
414 		dev->dev_id, virq_to_hw(*virq), dev->interrupt_id);
415 
416 	if (result) {
417 		FAIL("%s:%d: lv1_connect_interrupt_event_receive_port"
418 			" failed: %s\n", __func__, __LINE__,
419 			ps3_result(result));
420 		ps3_event_receive_port_destroy(*virq);
421 		*virq = 0;
422 		return result;
423 	}
424 
425 	DBG("%s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
426 		dev->interrupt_id, *virq);
427 
428 	return 0;
429 }
430 EXPORT_SYMBOL(ps3_sb_event_receive_port_setup);
431 
432 int ps3_sb_event_receive_port_destroy(struct ps3_system_bus_device *dev,
433 	unsigned int virq)
434 {
435 	/* this should go in system-bus.c */
436 
437 	int result;
438 
439 	DBG(" -> %s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
440 		dev->interrupt_id, virq);
441 
442 	result = lv1_disconnect_interrupt_event_receive_port(dev->bus_id,
443 		dev->dev_id, virq_to_hw(virq), dev->interrupt_id);
444 
445 	if (result)
446 		FAIL("%s:%d: lv1_disconnect_interrupt_event_receive_port"
447 			" failed: %s\n", __func__, __LINE__,
448 			ps3_result(result));
449 
450 	result = ps3_event_receive_port_destroy(virq);
451 	BUG_ON(result);
452 
453 	/*
454 	 * ps3_event_receive_port_destroy() destroys the IRQ plug,
455 	 * so don't call ps3_irq_plug_destroy() here.
456 	 */
457 
458 	result = ps3_virq_destroy(virq);
459 	BUG_ON(result);
460 
461 	DBG(" <- %s:%d\n", __func__, __LINE__);
462 	return result;
463 }
464 EXPORT_SYMBOL(ps3_sb_event_receive_port_destroy);
465 
466 /**
467  * ps3_io_irq_setup - Setup a system bus io irq.
468  * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
469  * serviced on.
470  * @interrupt_id: The device interrupt id read from the system repository.
471  * @virq: The assigned Linux virq.
472  *
473  * An io irq represents a non-virtualized device interrupt.  interrupt_id
474  * coresponds to the interrupt number of the interrupt controller.
475  */
476 
477 int ps3_io_irq_setup(enum ps3_cpu_binding cpu, unsigned int interrupt_id,
478 	unsigned int *virq)
479 {
480 	int result;
481 	u64 outlet;
482 
483 	result = lv1_construct_io_irq_outlet(interrupt_id, &outlet);
484 
485 	if (result) {
486 		FAIL("%s:%d: lv1_construct_io_irq_outlet failed: %s\n",
487 			__func__, __LINE__, ps3_result(result));
488 		return result;
489 	}
490 
491 	result = ps3_irq_plug_setup(cpu, outlet, virq);
492 	BUG_ON(result);
493 
494 	return result;
495 }
496 EXPORT_SYMBOL_GPL(ps3_io_irq_setup);
497 
498 int ps3_io_irq_destroy(unsigned int virq)
499 {
500 	int result;
501 	unsigned long outlet = virq_to_hw(virq);
502 
503 	ps3_chip_mask(irq_get_irq_data(virq));
504 
505 	/*
506 	 * lv1_destruct_io_irq_outlet() will destroy the IRQ plug,
507 	 * so call ps3_irq_plug_destroy() first.
508 	 */
509 
510 	result = ps3_irq_plug_destroy(virq);
511 	BUG_ON(result);
512 
513 	result = lv1_destruct_io_irq_outlet(outlet);
514 
515 	if (result)
516 		FAIL("%s:%d: lv1_destruct_io_irq_outlet failed: %s\n",
517 			__func__, __LINE__, ps3_result(result));
518 
519 	return result;
520 }
521 EXPORT_SYMBOL_GPL(ps3_io_irq_destroy);
522 
523 /**
524  * ps3_vuart_irq_setup - Setup the system virtual uart virq.
525  * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
526  * serviced on.
527  * @virt_addr_bmp: The caller supplied virtual uart interrupt bitmap.
528  * @virq: The assigned Linux virq.
529  *
530  * The system supports only a single virtual uart, so multiple calls without
531  * freeing the interrupt will return a wrong state error.
532  */
533 
534 int ps3_vuart_irq_setup(enum ps3_cpu_binding cpu, void* virt_addr_bmp,
535 	unsigned int *virq)
536 {
537 	int result;
538 	u64 outlet;
539 	u64 lpar_addr;
540 
541 	BUG_ON(!is_kernel_addr((u64)virt_addr_bmp));
542 
543 	lpar_addr = ps3_mm_phys_to_lpar(__pa(virt_addr_bmp));
544 
545 	result = lv1_configure_virtual_uart_irq(lpar_addr, &outlet);
546 
547 	if (result) {
548 		FAIL("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
549 			__func__, __LINE__, ps3_result(result));
550 		return result;
551 	}
552 
553 	result = ps3_irq_plug_setup(cpu, outlet, virq);
554 	BUG_ON(result);
555 
556 	return result;
557 }
558 EXPORT_SYMBOL_GPL(ps3_vuart_irq_setup);
559 
560 int ps3_vuart_irq_destroy(unsigned int virq)
561 {
562 	int result;
563 
564 	ps3_chip_mask(irq_get_irq_data(virq));
565 	result = lv1_deconfigure_virtual_uart_irq();
566 
567 	if (result) {
568 		FAIL("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
569 			__func__, __LINE__, ps3_result(result));
570 		return result;
571 	}
572 
573 	result = ps3_irq_plug_destroy(virq);
574 	BUG_ON(result);
575 
576 	return result;
577 }
578 EXPORT_SYMBOL_GPL(ps3_vuart_irq_destroy);
579 
580 /**
581  * ps3_spe_irq_setup - Setup an spe virq.
582  * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
583  * serviced on.
584  * @spe_id: The spe_id returned from lv1_construct_logical_spe().
585  * @class: The spe interrupt class {0,1,2}.
586  * @virq: The assigned Linux virq.
587  *
588  */
589 
590 int ps3_spe_irq_setup(enum ps3_cpu_binding cpu, unsigned long spe_id,
591 	unsigned int class, unsigned int *virq)
592 {
593 	int result;
594 	u64 outlet;
595 
596 	BUG_ON(class > 2);
597 
598 	result = lv1_get_spe_irq_outlet(spe_id, class, &outlet);
599 
600 	if (result) {
601 		FAIL("%s:%d: lv1_get_spe_irq_outlet failed: %s\n",
602 			__func__, __LINE__, ps3_result(result));
603 		return result;
604 	}
605 
606 	result = ps3_irq_plug_setup(cpu, outlet, virq);
607 	BUG_ON(result);
608 
609 	return result;
610 }
611 
612 int ps3_spe_irq_destroy(unsigned int virq)
613 {
614 	int result;
615 
616 	ps3_chip_mask(irq_get_irq_data(virq));
617 
618 	result = ps3_irq_plug_destroy(virq);
619 	BUG_ON(result);
620 
621 	return result;
622 }
623 
624 
625 #define PS3_INVALID_OUTLET ((irq_hw_number_t)-1)
626 #define PS3_PLUG_MAX 63
627 
628 #if defined(DEBUG)
629 static void _dump_64_bmp(const char *header, const u64 *p, unsigned cpu,
630 	const char* func, int line)
631 {
632 	pr_debug("%s:%d: %s %u {%04llx_%04llx_%04llx_%04llx}\n",
633 		func, line, header, cpu,
634 		*p >> 48, (*p >> 32) & 0xffff, (*p >> 16) & 0xffff,
635 		*p & 0xffff);
636 }
637 
638 static void __maybe_unused _dump_256_bmp(const char *header,
639 	const u64 *p, unsigned cpu, const char* func, int line)
640 {
641 	pr_debug("%s:%d: %s %u {%016llx:%016llx:%016llx:%016llx}\n",
642 		func, line, header, cpu, p[0], p[1], p[2], p[3]);
643 }
644 
645 #define dump_bmp(_x) _dump_bmp(_x, __func__, __LINE__)
646 static void _dump_bmp(struct ps3_private* pd, const char* func, int line)
647 {
648 	unsigned long flags;
649 
650 	spin_lock_irqsave(&pd->bmp_lock, flags);
651 	_dump_64_bmp("stat", &pd->bmp.status, pd->thread_id, func, line);
652 	_dump_64_bmp("mask", (u64*)&pd->bmp.mask, pd->thread_id, func, line);
653 	spin_unlock_irqrestore(&pd->bmp_lock, flags);
654 }
655 
656 #define dump_mask(_x) _dump_mask(_x, __func__, __LINE__)
657 static void __maybe_unused _dump_mask(struct ps3_private *pd,
658 	const char* func, int line)
659 {
660 	unsigned long flags;
661 
662 	spin_lock_irqsave(&pd->bmp_lock, flags);
663 	_dump_64_bmp("mask", (u64*)&pd->bmp.mask, pd->thread_id, func, line);
664 	spin_unlock_irqrestore(&pd->bmp_lock, flags);
665 }
666 #else
667 static void dump_bmp(struct ps3_private* pd) {};
668 #endif /* defined(DEBUG) */
669 
670 static int ps3_host_map(struct irq_domain *h, unsigned int virq,
671 	irq_hw_number_t hwirq)
672 {
673 	DBG("%s:%d: hwirq %lu, virq %u\n", __func__, __LINE__, hwirq,
674 		virq);
675 
676 	irq_set_chip_and_handler(virq, &ps3_irq_chip, handle_fasteoi_irq);
677 
678 	return 0;
679 }
680 
681 static int ps3_host_match(struct irq_domain *h, struct device_node *np,
682 			  enum irq_domain_bus_token bus_token)
683 {
684 	/* Match all */
685 	return 1;
686 }
687 
688 static const struct irq_domain_ops ps3_host_ops = {
689 	.map = ps3_host_map,
690 	.match = ps3_host_match,
691 };
692 
693 void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq)
694 {
695 	struct ps3_private *pd = &per_cpu(ps3_private, cpu);
696 
697 	set_bit(63 - virq, &pd->ipi_debug_brk_mask);
698 
699 	DBG("%s:%d: cpu %u, virq %u, mask %lxh\n", __func__, __LINE__,
700 		cpu, virq, pd->ipi_debug_brk_mask);
701 }
702 
703 void __init ps3_register_ipi_irq(unsigned int cpu, unsigned int virq)
704 {
705 	struct ps3_private *pd = &per_cpu(ps3_private, cpu);
706 
707 	set_bit(63 - virq, &pd->ipi_mask);
708 
709 	DBG("%s:%d: cpu %u, virq %u, ipi_mask %lxh\n", __func__, __LINE__,
710 		cpu, virq, pd->ipi_mask);
711 }
712 
713 static unsigned int ps3_get_irq(void)
714 {
715 	struct ps3_private *pd = this_cpu_ptr(&ps3_private);
716 	u64 x = (pd->bmp.status & pd->bmp.mask);
717 	unsigned int plug;
718 
719 	/* check for ipi break first to stop this cpu ASAP */
720 
721 	if (x & pd->ipi_debug_brk_mask)
722 		x &= pd->ipi_debug_brk_mask;
723 
724 	asm volatile("cntlzd %0,%1" : "=r" (plug) : "r" (x));
725 	plug &= 0x3f;
726 
727 	if (unlikely(!plug)) {
728 		DBG("%s:%d: no plug found: thread_id %llu\n", __func__,
729 			__LINE__, pd->thread_id);
730 		dump_bmp(&per_cpu(ps3_private, 0));
731 		dump_bmp(&per_cpu(ps3_private, 1));
732 		return 0;
733 	}
734 
735 #if defined(DEBUG)
736 	if (unlikely(plug < NUM_ISA_INTERRUPTS || plug > PS3_PLUG_MAX)) {
737 		dump_bmp(&per_cpu(ps3_private, 0));
738 		dump_bmp(&per_cpu(ps3_private, 1));
739 		BUG();
740 	}
741 #endif
742 
743 	/* IPIs are EOIed here. */
744 
745 	if (test_bit(63 - plug, &pd->ipi_mask))
746 		lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, plug);
747 
748 	return plug;
749 }
750 
751 void __init ps3_init_IRQ(void)
752 {
753 	int result;
754 	unsigned cpu;
755 	struct irq_domain *host;
756 
757 	host = irq_domain_add_nomap(NULL, PS3_PLUG_MAX + 1, &ps3_host_ops, NULL);
758 	irq_set_default_host(host);
759 
760 	for_each_possible_cpu(cpu) {
761 		struct ps3_private *pd = &per_cpu(ps3_private, cpu);
762 
763 		lv1_get_logical_ppe_id(&pd->ppe_id);
764 		pd->thread_id = get_hard_smp_processor_id(cpu);
765 		spin_lock_init(&pd->bmp_lock);
766 
767 		DBG("%s:%d: ppe_id %llu, thread_id %llu, bmp %lxh\n",
768 			__func__, __LINE__, pd->ppe_id, pd->thread_id,
769 			ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
770 
771 		result = lv1_configure_irq_state_bitmap(pd->ppe_id,
772 			pd->thread_id, ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
773 
774 		if (result)
775 			FAIL("%s:%d: lv1_configure_irq_state_bitmap failed:"
776 				" %s\n", __func__, __LINE__,
777 				ps3_result(result));
778 	}
779 
780 	ppc_md.get_irq = ps3_get_irq;
781 }
782 
783 void ps3_shutdown_IRQ(int cpu)
784 {
785 	int result;
786 	u64 ppe_id;
787 	u64 thread_id = get_hard_smp_processor_id(cpu);
788 
789 	lv1_get_logical_ppe_id(&ppe_id);
790 	result = lv1_configure_irq_state_bitmap(ppe_id, thread_id, 0);
791 
792 	DBG("%s:%d: lv1_configure_irq_state_bitmap (%llu:%llu/%d) %s\n", __func__,
793 		__LINE__, ppe_id, thread_id, cpu, ps3_result(result));
794 }
795