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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * I/O SAPIC support.
4 *
5 * Copyright (C) 1999 Intel Corp.
6 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
7 * Copyright (C) 2000-2002 J.I. Lee <jung-ik.lee@intel.com>
8 * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co.
9 * David Mosberger-Tang <davidm@hpl.hp.com>
10 * Copyright (C) 1999 VA Linux Systems
11 * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
12 *
13 * 00/04/19 D. Mosberger Rewritten to mirror more closely the x86 I/O
14 * APIC code. In particular, we now have separate
15 * handlers for edge and level triggered
16 * interrupts.
17 * 00/10/27 Asit Mallick, Goutham Rao <goutham.rao@intel.com> IRQ vector
18 * allocation PCI to vector mapping, shared PCI
19 * interrupts.
20 * 00/10/27 D. Mosberger Document things a bit more to make them more
21 * understandable. Clean up much of the old
22 * IOSAPIC cruft.
23 * 01/07/27 J.I. Lee PCI irq routing, Platform/Legacy interrupts
24 * and fixes for ACPI S5(SoftOff) support.
25 * 02/01/23 J.I. Lee iosapic pgm fixes for PCI irq routing from _PRT
26 * 02/01/07 E. Focht <efocht@ess.nec.de> Redirectable interrupt
27 * vectors in iosapic_set_affinity(),
28 * initializations for /proc/irq/#/smp_affinity
29 * 02/04/02 P. Diefenbaugh Cleaned up ACPI PCI IRQ routing.
30 * 02/04/18 J.I. Lee bug fix in iosapic_init_pci_irq
31 * 02/04/30 J.I. Lee bug fix in find_iosapic to fix ACPI PCI IRQ to
32 * IOSAPIC mapping error
33 * 02/07/29 T. Kochi Allocate interrupt vectors dynamically
34 * 02/08/04 T. Kochi Cleaned up terminology (irq, global system
35 * interrupt, vector, etc.)
36 * 02/09/20 D. Mosberger Simplified by taking advantage of ACPI's
37 * pci_irq code.
38 * 03/02/19 B. Helgaas Make pcat_compat system-wide, not per-IOSAPIC.
39 * Remove iosapic_address & gsi_base from
40 * external interfaces. Rationalize
41 * __init/__devinit attributes.
42 * 04/12/04 Ashok Raj <ashok.raj@intel.com> Intel Corporation 2004
43 * Updated to work with irq migration necessary
44 * for CPU Hotplug
45 */
46/*
47 * Here is what the interrupt logic between a PCI device and the kernel looks
48 * like:
49 *
50 * (1) A PCI device raises one of the four interrupt pins (INTA, INTB, INTC,
51 * INTD). The device is uniquely identified by its bus-, and slot-number
52 * (the function number does not matter here because all functions share
53 * the same interrupt lines).
54 *
55 * (2) The motherboard routes the interrupt line to a pin on a IOSAPIC
56 * controller. Multiple interrupt lines may have to share the same
57 * IOSAPIC pin (if they're level triggered and use the same polarity).
58 * Each interrupt line has a unique Global System Interrupt (GSI) number
59 * which can be calculated as the sum of the controller's base GSI number
60 * and the IOSAPIC pin number to which the line connects.
61 *
62 * (3) The IOSAPIC uses an internal routing table entries (RTEs) to map the
63 * IOSAPIC pin into the IA-64 interrupt vector. This interrupt vector is then
64 * sent to the CPU.
65 *
66 * (4) The kernel recognizes an interrupt as an IRQ. The IRQ interface is
67 * used as architecture-independent interrupt handling mechanism in Linux.
68 * As an IRQ is a number, we have to have
69 * IA-64 interrupt vector number <-> IRQ number mapping. On smaller
70 * systems, we use one-to-one mapping between IA-64 vector and IRQ.
71 *
72 * To sum up, there are three levels of mappings involved:
73 *
74 * PCI pin -> global system interrupt (GSI) -> IA-64 vector <-> IRQ
75 *
76 * Note: The term "IRQ" is loosely used everywhere in Linux kernel to
77 * describe interrupts. Now we use "IRQ" only for Linux IRQ's. ISA IRQ
78 * (isa_irq) is the only exception in this source code.
79 */
80
81#include <linux/acpi.h>
82#include <linux/init.h>
83#include <linux/irq.h>
84#include <linux/kernel.h>
85#include <linux/list.h>
86#include <linux/pci.h>
87#include <linux/slab.h>
88#include <linux/smp.h>
89#include <linux/string.h>
90#include <linux/memblock.h>
91
92#include <asm/delay.h>
93#include <asm/hw_irq.h>
94#include <asm/io.h>
95#include <asm/iosapic.h>
96#include <asm/processor.h>
97#include <asm/ptrace.h>
98
99#undef DEBUG_INTERRUPT_ROUTING
100
101#ifdef DEBUG_INTERRUPT_ROUTING
102#define DBG(fmt...) printk(fmt)
103#else
104#define DBG(fmt...)
105#endif
106
107static DEFINE_SPINLOCK(iosapic_lock);
108
109/*
110 * These tables map IA-64 vectors to the IOSAPIC pin that generates this
111 * vector.
112 */
113
114#define NO_REF_RTE 0
115
116static struct iosapic {
117 char __iomem *addr; /* base address of IOSAPIC */
118 unsigned int gsi_base; /* GSI base */
119 unsigned short num_rte; /* # of RTEs on this IOSAPIC */
120 int rtes_inuse; /* # of RTEs in use on this IOSAPIC */
121#ifdef CONFIG_NUMA
122 unsigned short node; /* numa node association via pxm */
123#endif
124 spinlock_t lock; /* lock for indirect reg access */
125} iosapic_lists[NR_IOSAPICS];
126
127struct iosapic_rte_info {
128 struct list_head rte_list; /* RTEs sharing the same vector */
129 char rte_index; /* IOSAPIC RTE index */
130 int refcnt; /* reference counter */
131 struct iosapic *iosapic;
132} ____cacheline_aligned;
133
134static struct iosapic_intr_info {
135 struct list_head rtes; /* RTEs using this vector (empty =>
136 * not an IOSAPIC interrupt) */
137 int count; /* # of registered RTEs */
138 u32 low32; /* current value of low word of
139 * Redirection table entry */
140 unsigned int dest; /* destination CPU physical ID */
141 unsigned char dmode : 3; /* delivery mode (see iosapic.h) */
142 unsigned char polarity: 1; /* interrupt polarity
143 * (see iosapic.h) */
144 unsigned char trigger : 1; /* trigger mode (see iosapic.h) */
145} iosapic_intr_info[NR_IRQS];
146
147static unsigned char pcat_compat; /* 8259 compatibility flag */
148
149static inline void
150iosapic_write(struct iosapic *iosapic, unsigned int reg, u32 val)
151{
152 unsigned long flags;
153
154 spin_lock_irqsave(&iosapic->lock, flags);
155 __iosapic_write(iosapic->addr, reg, val);
156 spin_unlock_irqrestore(&iosapic->lock, flags);
157}
158
159/*
160 * Find an IOSAPIC associated with a GSI
161 */
162static inline int
163find_iosapic (unsigned int gsi)
164{
165 int i;
166
167 for (i = 0; i < NR_IOSAPICS; i++) {
168 if ((unsigned) (gsi - iosapic_lists[i].gsi_base) <
169 iosapic_lists[i].num_rte)
170 return i;
171 }
172
173 return -1;
174}
175
176static inline int __gsi_to_irq(unsigned int gsi)
177{
178 int irq;
179 struct iosapic_intr_info *info;
180 struct iosapic_rte_info *rte;
181
182 for (irq = 0; irq < NR_IRQS; irq++) {
183 info = &iosapic_intr_info[irq];
184 list_for_each_entry(rte, &info->rtes, rte_list)
185 if (rte->iosapic->gsi_base + rte->rte_index == gsi)
186 return irq;
187 }
188 return -1;
189}
190
191int
192gsi_to_irq (unsigned int gsi)
193{
194 unsigned long flags;
195 int irq;
196
197 spin_lock_irqsave(&iosapic_lock, flags);
198 irq = __gsi_to_irq(gsi);
199 spin_unlock_irqrestore(&iosapic_lock, flags);
200 return irq;
201}
202
203static struct iosapic_rte_info *find_rte(unsigned int irq, unsigned int gsi)
204{
205 struct iosapic_rte_info *rte;
206
207 list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list)
208 if (rte->iosapic->gsi_base + rte->rte_index == gsi)
209 return rte;
210 return NULL;
211}
212
213static void
214set_rte (unsigned int gsi, unsigned int irq, unsigned int dest, int mask)
215{
216 unsigned long pol, trigger, dmode;
217 u32 low32, high32;
218 int rte_index;
219 char redir;
220 struct iosapic_rte_info *rte;
221 ia64_vector vector = irq_to_vector(irq);
222
223 DBG(KERN_DEBUG"IOSAPIC: routing vector %d to 0x%x\n", vector, dest);
224
225 rte = find_rte(irq, gsi);
226 if (!rte)
227 return; /* not an IOSAPIC interrupt */
228
229 rte_index = rte->rte_index;
230 pol = iosapic_intr_info[irq].polarity;
231 trigger = iosapic_intr_info[irq].trigger;
232 dmode = iosapic_intr_info[irq].dmode;
233
234 redir = (dmode == IOSAPIC_LOWEST_PRIORITY) ? 1 : 0;
235
236#ifdef CONFIG_SMP
237 set_irq_affinity_info(irq, (int)(dest & 0xffff), redir);
238#endif
239
240 low32 = ((pol << IOSAPIC_POLARITY_SHIFT) |
241 (trigger << IOSAPIC_TRIGGER_SHIFT) |
242 (dmode << IOSAPIC_DELIVERY_SHIFT) |
243 ((mask ? 1 : 0) << IOSAPIC_MASK_SHIFT) |
244 vector);
245
246 /* dest contains both id and eid */
247 high32 = (dest << IOSAPIC_DEST_SHIFT);
248
249 iosapic_write(rte->iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);
250 iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
251 iosapic_intr_info[irq].low32 = low32;
252 iosapic_intr_info[irq].dest = dest;
253}
254
255static void
256iosapic_nop (struct irq_data *data)
257{
258 /* do nothing... */
259}
260
261
262#ifdef CONFIG_KEXEC
263void
264kexec_disable_iosapic(void)
265{
266 struct iosapic_intr_info *info;
267 struct iosapic_rte_info *rte;
268 ia64_vector vec;
269 int irq;
270
271 for (irq = 0; irq < NR_IRQS; irq++) {
272 info = &iosapic_intr_info[irq];
273 vec = irq_to_vector(irq);
274 list_for_each_entry(rte, &info->rtes,
275 rte_list) {
276 iosapic_write(rte->iosapic,
277 IOSAPIC_RTE_LOW(rte->rte_index),
278 IOSAPIC_MASK|vec);
279 iosapic_eoi(rte->iosapic->addr, vec);
280 }
281 }
282}
283#endif
284
285static void
286mask_irq (struct irq_data *data)
287{
288 unsigned int irq = data->irq;
289 u32 low32;
290 int rte_index;
291 struct iosapic_rte_info *rte;
292
293 if (!iosapic_intr_info[irq].count)
294 return; /* not an IOSAPIC interrupt! */
295
296 /* set only the mask bit */
297 low32 = iosapic_intr_info[irq].low32 |= IOSAPIC_MASK;
298 list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
299 rte_index = rte->rte_index;
300 iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
301 }
302}
303
304static void
305unmask_irq (struct irq_data *data)
306{
307 unsigned int irq = data->irq;
308 u32 low32;
309 int rte_index;
310 struct iosapic_rte_info *rte;
311
312 if (!iosapic_intr_info[irq].count)
313 return; /* not an IOSAPIC interrupt! */
314
315 low32 = iosapic_intr_info[irq].low32 &= ~IOSAPIC_MASK;
316 list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
317 rte_index = rte->rte_index;
318 iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
319 }
320}
321
322
323static int
324iosapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
325 bool force)
326{
327#ifdef CONFIG_SMP
328 unsigned int irq = data->irq;
329 u32 high32, low32;
330 int cpu, dest, rte_index;
331 int redir = (irq & IA64_IRQ_REDIRECTED) ? 1 : 0;
332 struct iosapic_rte_info *rte;
333 struct iosapic *iosapic;
334
335 irq &= (~IA64_IRQ_REDIRECTED);
336
337 cpu = cpumask_first_and(cpu_online_mask, mask);
338 if (cpu >= nr_cpu_ids)
339 return -1;
340
341 if (irq_prepare_move(irq, cpu))
342 return -1;
343
344 dest = cpu_physical_id(cpu);
345
346 if (!iosapic_intr_info[irq].count)
347 return -1; /* not an IOSAPIC interrupt */
348
349 set_irq_affinity_info(irq, dest, redir);
350
351 /* dest contains both id and eid */
352 high32 = dest << IOSAPIC_DEST_SHIFT;
353
354 low32 = iosapic_intr_info[irq].low32 & ~(7 << IOSAPIC_DELIVERY_SHIFT);
355 if (redir)
356 /* change delivery mode to lowest priority */
357 low32 |= (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
358 else
359 /* change delivery mode to fixed */
360 low32 |= (IOSAPIC_FIXED << IOSAPIC_DELIVERY_SHIFT);
361 low32 &= IOSAPIC_VECTOR_MASK;
362 low32 |= irq_to_vector(irq);
363
364 iosapic_intr_info[irq].low32 = low32;
365 iosapic_intr_info[irq].dest = dest;
366 list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
367 iosapic = rte->iosapic;
368 rte_index = rte->rte_index;
369 iosapic_write(iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);
370 iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
371 }
372
373#endif
374 return 0;
375}
376
377/*
378 * Handlers for level-triggered interrupts.
379 */
380
381static unsigned int
382iosapic_startup_level_irq (struct irq_data *data)
383{
384 unmask_irq(data);
385 return 0;
386}
387
388static void
389iosapic_unmask_level_irq (struct irq_data *data)
390{
391 unsigned int irq = data->irq;
392 ia64_vector vec = irq_to_vector(irq);
393 struct iosapic_rte_info *rte;
394 int do_unmask_irq = 0;
395
396 irq_complete_move(irq);
397 if (unlikely(irqd_is_setaffinity_pending(data))) {
398 do_unmask_irq = 1;
399 mask_irq(data);
400 } else
401 unmask_irq(data);
402
403 list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list)
404 iosapic_eoi(rte->iosapic->addr, vec);
405
406 if (unlikely(do_unmask_irq)) {
407 irq_move_masked_irq(data);
408 unmask_irq(data);
409 }
410}
411
412#define iosapic_shutdown_level_irq mask_irq
413#define iosapic_enable_level_irq unmask_irq
414#define iosapic_disable_level_irq mask_irq
415#define iosapic_ack_level_irq iosapic_nop
416
417static struct irq_chip irq_type_iosapic_level = {
418 .name = "IO-SAPIC-level",
419 .irq_startup = iosapic_startup_level_irq,
420 .irq_shutdown = iosapic_shutdown_level_irq,
421 .irq_enable = iosapic_enable_level_irq,
422 .irq_disable = iosapic_disable_level_irq,
423 .irq_ack = iosapic_ack_level_irq,
424 .irq_mask = mask_irq,
425 .irq_unmask = iosapic_unmask_level_irq,
426 .irq_set_affinity = iosapic_set_affinity
427};
428
429/*
430 * Handlers for edge-triggered interrupts.
431 */
432
433static unsigned int
434iosapic_startup_edge_irq (struct irq_data *data)
435{
436 unmask_irq(data);
437 /*
438 * IOSAPIC simply drops interrupts pended while the
439 * corresponding pin was masked, so we can't know if an
440 * interrupt is pending already. Let's hope not...
441 */
442 return 0;
443}
444
445static void
446iosapic_ack_edge_irq (struct irq_data *data)
447{
448 irq_complete_move(data->irq);
449 irq_move_irq(data);
450}
451
452#define iosapic_enable_edge_irq unmask_irq
453#define iosapic_disable_edge_irq iosapic_nop
454
455static struct irq_chip irq_type_iosapic_edge = {
456 .name = "IO-SAPIC-edge",
457 .irq_startup = iosapic_startup_edge_irq,
458 .irq_shutdown = iosapic_disable_edge_irq,
459 .irq_enable = iosapic_enable_edge_irq,
460 .irq_disable = iosapic_disable_edge_irq,
461 .irq_ack = iosapic_ack_edge_irq,
462 .irq_mask = mask_irq,
463 .irq_unmask = unmask_irq,
464 .irq_set_affinity = iosapic_set_affinity
465};
466
467static unsigned int
468iosapic_version (char __iomem *addr)
469{
470 /*
471 * IOSAPIC Version Register return 32 bit structure like:
472 * {
473 * unsigned int version : 8;
474 * unsigned int reserved1 : 8;
475 * unsigned int max_redir : 8;
476 * unsigned int reserved2 : 8;
477 * }
478 */
479 return __iosapic_read(addr, IOSAPIC_VERSION);
480}
481
482static int iosapic_find_sharable_irq(unsigned long trigger, unsigned long pol)
483{
484 int i, irq = -ENOSPC, min_count = -1;
485 struct iosapic_intr_info *info;
486
487 /*
488 * shared vectors for edge-triggered interrupts are not
489 * supported yet
490 */
491 if (trigger == IOSAPIC_EDGE)
492 return -EINVAL;
493
494 for (i = 0; i < NR_IRQS; i++) {
495 info = &iosapic_intr_info[i];
496 if (info->trigger == trigger && info->polarity == pol &&
497 (info->dmode == IOSAPIC_FIXED ||
498 info->dmode == IOSAPIC_LOWEST_PRIORITY) &&
499 can_request_irq(i, IRQF_SHARED)) {
500 if (min_count == -1 || info->count < min_count) {
501 irq = i;
502 min_count = info->count;
503 }
504 }
505 }
506 return irq;
507}
508
509/*
510 * if the given vector is already owned by other,
511 * assign a new vector for the other and make the vector available
512 */
513static void __init
514iosapic_reassign_vector (int irq)
515{
516 int new_irq;
517
518 if (iosapic_intr_info[irq].count) {
519 new_irq = create_irq();
520 if (new_irq < 0)
521 panic("%s: out of interrupt vectors!\n", __func__);
522 printk(KERN_INFO "Reassigning vector %d to %d\n",
523 irq_to_vector(irq), irq_to_vector(new_irq));
524 memcpy(&iosapic_intr_info[new_irq], &iosapic_intr_info[irq],
525 sizeof(struct iosapic_intr_info));
526 INIT_LIST_HEAD(&iosapic_intr_info[new_irq].rtes);
527 list_move(iosapic_intr_info[irq].rtes.next,
528 &iosapic_intr_info[new_irq].rtes);
529 memset(&iosapic_intr_info[irq], 0,
530 sizeof(struct iosapic_intr_info));
531 iosapic_intr_info[irq].low32 = IOSAPIC_MASK;
532 INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes);
533 }
534}
535
536static inline int irq_is_shared (int irq)
537{
538 return (iosapic_intr_info[irq].count > 1);
539}
540
541struct irq_chip*
542ia64_native_iosapic_get_irq_chip(unsigned long trigger)
543{
544 if (trigger == IOSAPIC_EDGE)
545 return &irq_type_iosapic_edge;
546 else
547 return &irq_type_iosapic_level;
548}
549
550static int
551register_intr (unsigned int gsi, int irq, unsigned char delivery,
552 unsigned long polarity, unsigned long trigger)
553{
554 struct irq_chip *chip, *irq_type;
555 int index;
556 struct iosapic_rte_info *rte;
557
558 index = find_iosapic(gsi);
559 if (index < 0) {
560 printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n",
561 __func__, gsi);
562 return -ENODEV;
563 }
564
565 rte = find_rte(irq, gsi);
566 if (!rte) {
567 rte = kzalloc(sizeof (*rte), GFP_ATOMIC);
568 if (!rte) {
569 printk(KERN_WARNING "%s: cannot allocate memory\n",
570 __func__);
571 return -ENOMEM;
572 }
573
574 rte->iosapic = &iosapic_lists[index];
575 rte->rte_index = gsi - rte->iosapic->gsi_base;
576 rte->refcnt++;
577 list_add_tail(&rte->rte_list, &iosapic_intr_info[irq].rtes);
578 iosapic_intr_info[irq].count++;
579 iosapic_lists[index].rtes_inuse++;
580 }
581 else if (rte->refcnt == NO_REF_RTE) {
582 struct iosapic_intr_info *info = &iosapic_intr_info[irq];
583 if (info->count > 0 &&
584 (info->trigger != trigger || info->polarity != polarity)){
585 printk (KERN_WARNING
586 "%s: cannot override the interrupt\n",
587 __func__);
588 return -EINVAL;
589 }
590 rte->refcnt++;
591 iosapic_intr_info[irq].count++;
592 iosapic_lists[index].rtes_inuse++;
593 }
594
595 iosapic_intr_info[irq].polarity = polarity;
596 iosapic_intr_info[irq].dmode = delivery;
597 iosapic_intr_info[irq].trigger = trigger;
598
599 irq_type = iosapic_get_irq_chip(trigger);
600
601 chip = irq_get_chip(irq);
602 if (irq_type != NULL && chip != irq_type) {
603 if (chip != &no_irq_chip)
604 printk(KERN_WARNING
605 "%s: changing vector %d from %s to %s\n",
606 __func__, irq_to_vector(irq),
607 chip->name, irq_type->name);
608 chip = irq_type;
609 }
610 irq_set_chip_handler_name_locked(irq_get_irq_data(irq), chip,
611 trigger == IOSAPIC_EDGE ? handle_edge_irq : handle_level_irq,
612 NULL);
613 return 0;
614}
615
616static unsigned int
617get_target_cpu (unsigned int gsi, int irq)
618{
619#ifdef CONFIG_SMP
620 static int cpu = -1;
621 extern int cpe_vector;
622 cpumask_t domain = irq_to_domain(irq);
623
624 /*
625 * In case of vector shared by multiple RTEs, all RTEs that
626 * share the vector need to use the same destination CPU.
627 */
628 if (iosapic_intr_info[irq].count)
629 return iosapic_intr_info[irq].dest;
630
631 /*
632 * If the platform supports redirection via XTP, let it
633 * distribute interrupts.
634 */
635 if (smp_int_redirect & SMP_IRQ_REDIRECTION)
636 return cpu_physical_id(smp_processor_id());
637
638 /*
639 * Some interrupts (ACPI SCI, for instance) are registered
640 * before the BSP is marked as online.
641 */
642 if (!cpu_online(smp_processor_id()))
643 return cpu_physical_id(smp_processor_id());
644
645 if (cpe_vector > 0 && irq_to_vector(irq) == IA64_CPEP_VECTOR)
646 return get_cpei_target_cpu();
647
648#ifdef CONFIG_NUMA
649 {
650 int num_cpus, cpu_index, iosapic_index, numa_cpu, i = 0;
651 const struct cpumask *cpu_mask;
652
653 iosapic_index = find_iosapic(gsi);
654 if (iosapic_index < 0 ||
655 iosapic_lists[iosapic_index].node == MAX_NUMNODES)
656 goto skip_numa_setup;
657
658 cpu_mask = cpumask_of_node(iosapic_lists[iosapic_index].node);
659 num_cpus = 0;
660 for_each_cpu_and(numa_cpu, cpu_mask, &domain) {
661 if (cpu_online(numa_cpu))
662 num_cpus++;
663 }
664
665 if (!num_cpus)
666 goto skip_numa_setup;
667
668 /* Use irq assignment to distribute across cpus in node */
669 cpu_index = irq % num_cpus;
670
671 for_each_cpu_and(numa_cpu, cpu_mask, &domain)
672 if (cpu_online(numa_cpu) && i++ >= cpu_index)
673 break;
674
675 if (numa_cpu < nr_cpu_ids)
676 return cpu_physical_id(numa_cpu);
677 }
678skip_numa_setup:
679#endif
680 /*
681 * Otherwise, round-robin interrupt vectors across all the
682 * processors. (It'd be nice if we could be smarter in the
683 * case of NUMA.)
684 */
685 do {
686 if (++cpu >= nr_cpu_ids)
687 cpu = 0;
688 } while (!cpu_online(cpu) || !cpumask_test_cpu(cpu, &domain));
689
690 return cpu_physical_id(cpu);
691#else /* CONFIG_SMP */
692 return cpu_physical_id(smp_processor_id());
693#endif
694}
695
696static inline unsigned char choose_dmode(void)
697{
698#ifdef CONFIG_SMP
699 if (smp_int_redirect & SMP_IRQ_REDIRECTION)
700 return IOSAPIC_LOWEST_PRIORITY;
701#endif
702 return IOSAPIC_FIXED;
703}
704
705/*
706 * ACPI can describe IOSAPIC interrupts via static tables and namespace
707 * methods. This provides an interface to register those interrupts and
708 * program the IOSAPIC RTE.
709 */
710int
711iosapic_register_intr (unsigned int gsi,
712 unsigned long polarity, unsigned long trigger)
713{
714 int irq, mask = 1, err;
715 unsigned int dest;
716 unsigned long flags;
717 struct iosapic_rte_info *rte;
718 u32 low32;
719 unsigned char dmode;
720 struct irq_desc *desc;
721
722 /*
723 * If this GSI has already been registered (i.e., it's a
724 * shared interrupt, or we lost a race to register it),
725 * don't touch the RTE.
726 */
727 spin_lock_irqsave(&iosapic_lock, flags);
728 irq = __gsi_to_irq(gsi);
729 if (irq > 0) {
730 rte = find_rte(irq, gsi);
731 if(iosapic_intr_info[irq].count == 0) {
732 assign_irq_vector(irq);
733 irq_init_desc(irq);
734 } else if (rte->refcnt != NO_REF_RTE) {
735 rte->refcnt++;
736 goto unlock_iosapic_lock;
737 }
738 } else
739 irq = create_irq();
740
741 /* If vector is running out, we try to find a sharable vector */
742 if (irq < 0) {
743 irq = iosapic_find_sharable_irq(trigger, polarity);
744 if (irq < 0)
745 goto unlock_iosapic_lock;
746 }
747
748 desc = irq_to_desc(irq);
749 raw_spin_lock(&desc->lock);
750 dest = get_target_cpu(gsi, irq);
751 dmode = choose_dmode();
752 err = register_intr(gsi, irq, dmode, polarity, trigger);
753 if (err < 0) {
754 raw_spin_unlock(&desc->lock);
755 irq = err;
756 goto unlock_iosapic_lock;
757 }
758
759 /*
760 * If the vector is shared and already unmasked for other
761 * interrupt sources, don't mask it.
762 */
763 low32 = iosapic_intr_info[irq].low32;
764 if (irq_is_shared(irq) && !(low32 & IOSAPIC_MASK))
765 mask = 0;
766 set_rte(gsi, irq, dest, mask);
767
768 printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n",
769 gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
770 (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
771 cpu_logical_id(dest), dest, irq_to_vector(irq));
772
773 raw_spin_unlock(&desc->lock);
774 unlock_iosapic_lock:
775 spin_unlock_irqrestore(&iosapic_lock, flags);
776 return irq;
777}
778
779void
780iosapic_unregister_intr (unsigned int gsi)
781{
782 unsigned long flags;
783 int irq, index;
784 u32 low32;
785 unsigned long trigger, polarity;
786 unsigned int dest;
787 struct iosapic_rte_info *rte;
788
789 /*
790 * If the irq associated with the gsi is not found,
791 * iosapic_unregister_intr() is unbalanced. We need to check
792 * this again after getting locks.
793 */
794 irq = gsi_to_irq(gsi);
795 if (irq < 0) {
796 printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n",
797 gsi);
798 WARN_ON(1);
799 return;
800 }
801
802 spin_lock_irqsave(&iosapic_lock, flags);
803 if ((rte = find_rte(irq, gsi)) == NULL) {
804 printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n",
805 gsi);
806 WARN_ON(1);
807 goto out;
808 }
809
810 if (--rte->refcnt > 0)
811 goto out;
812
813 rte->refcnt = NO_REF_RTE;
814
815 /* Mask the interrupt */
816 low32 = iosapic_intr_info[irq].low32 | IOSAPIC_MASK;
817 iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte->rte_index), low32);
818
819 iosapic_intr_info[irq].count--;
820 index = find_iosapic(gsi);
821 iosapic_lists[index].rtes_inuse--;
822 WARN_ON(iosapic_lists[index].rtes_inuse < 0);
823
824 trigger = iosapic_intr_info[irq].trigger;
825 polarity = iosapic_intr_info[irq].polarity;
826 dest = iosapic_intr_info[irq].dest;
827 printk(KERN_INFO
828 "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d unregistered\n",
829 gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
830 (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
831 cpu_logical_id(dest), dest, irq_to_vector(irq));
832
833 if (iosapic_intr_info[irq].count == 0) {
834#ifdef CONFIG_SMP
835 /* Clear affinity */
836 cpumask_setall(irq_get_affinity_mask(irq));
837#endif
838 /* Clear the interrupt information */
839 iosapic_intr_info[irq].dest = 0;
840 iosapic_intr_info[irq].dmode = 0;
841 iosapic_intr_info[irq].polarity = 0;
842 iosapic_intr_info[irq].trigger = 0;
843 iosapic_intr_info[irq].low32 |= IOSAPIC_MASK;
844
845 /* Destroy and reserve IRQ */
846 destroy_and_reserve_irq(irq);
847 }
848 out:
849 spin_unlock_irqrestore(&iosapic_lock, flags);
850}
851
852/*
853 * ACPI calls this when it finds an entry for a platform interrupt.
854 */
855int __init
856iosapic_register_platform_intr (u32 int_type, unsigned int gsi,
857 int iosapic_vector, u16 eid, u16 id,
858 unsigned long polarity, unsigned long trigger)
859{
860 static const char * const name[] = {"unknown", "PMI", "INIT", "CPEI"};
861 unsigned char delivery;
862 int irq, vector, mask = 0;
863 unsigned int dest = ((id << 8) | eid) & 0xffff;
864
865 switch (int_type) {
866 case ACPI_INTERRUPT_PMI:
867 irq = vector = iosapic_vector;
868 bind_irq_vector(irq, vector, CPU_MASK_ALL);
869 /*
870 * since PMI vector is alloc'd by FW(ACPI) not by kernel,
871 * we need to make sure the vector is available
872 */
873 iosapic_reassign_vector(irq);
874 delivery = IOSAPIC_PMI;
875 break;
876 case ACPI_INTERRUPT_INIT:
877 irq = create_irq();
878 if (irq < 0)
879 panic("%s: out of interrupt vectors!\n", __func__);
880 vector = irq_to_vector(irq);
881 delivery = IOSAPIC_INIT;
882 break;
883 case ACPI_INTERRUPT_CPEI:
884 irq = vector = IA64_CPE_VECTOR;
885 BUG_ON(bind_irq_vector(irq, vector, CPU_MASK_ALL));
886 delivery = IOSAPIC_FIXED;
887 mask = 1;
888 break;
889 default:
890 printk(KERN_ERR "%s: invalid int type 0x%x\n", __func__,
891 int_type);
892 return -1;
893 }
894
895 register_intr(gsi, irq, delivery, polarity, trigger);
896
897 printk(KERN_INFO
898 "PLATFORM int %s (0x%x): GSI %u (%s, %s) -> CPU %d (0x%04x)"
899 " vector %d\n",
900 int_type < ARRAY_SIZE(name) ? name[int_type] : "unknown",
901 int_type, gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
902 (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
903 cpu_logical_id(dest), dest, vector);
904
905 set_rte(gsi, irq, dest, mask);
906 return vector;
907}
908
909/*
910 * ACPI calls this when it finds an entry for a legacy ISA IRQ override.
911 */
912void iosapic_override_isa_irq(unsigned int isa_irq, unsigned int gsi,
913 unsigned long polarity, unsigned long trigger)
914{
915 int vector, irq;
916 unsigned int dest = cpu_physical_id(smp_processor_id());
917 unsigned char dmode;
918
919 irq = vector = isa_irq_to_vector(isa_irq);
920 BUG_ON(bind_irq_vector(irq, vector, CPU_MASK_ALL));
921 dmode = choose_dmode();
922 register_intr(gsi, irq, dmode, polarity, trigger);
923
924 DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n",
925 isa_irq, gsi, trigger == IOSAPIC_EDGE ? "edge" : "level",
926 polarity == IOSAPIC_POL_HIGH ? "high" : "low",
927 cpu_logical_id(dest), dest, vector);
928
929 set_rte(gsi, irq, dest, 1);
930}
931
932void __init
933ia64_native_iosapic_pcat_compat_init(void)
934{
935 if (pcat_compat) {
936 /*
937 * Disable the compatibility mode interrupts (8259 style),
938 * needs IN/OUT support enabled.
939 */
940 printk(KERN_INFO
941 "%s: Disabling PC-AT compatible 8259 interrupts\n",
942 __func__);
943 outb(0xff, 0xA1);
944 outb(0xff, 0x21);
945 }
946}
947
948void __init
949iosapic_system_init (int system_pcat_compat)
950{
951 int irq;
952
953 for (irq = 0; irq < NR_IRQS; ++irq) {
954 iosapic_intr_info[irq].low32 = IOSAPIC_MASK;
955 /* mark as unused */
956 INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes);
957
958 iosapic_intr_info[irq].count = 0;
959 }
960
961 pcat_compat = system_pcat_compat;
962 if (pcat_compat)
963 iosapic_pcat_compat_init();
964}
965
966static inline int
967iosapic_alloc (void)
968{
969 int index;
970
971 for (index = 0; index < NR_IOSAPICS; index++)
972 if (!iosapic_lists[index].addr)
973 return index;
974
975 printk(KERN_WARNING "%s: failed to allocate iosapic\n", __func__);
976 return -1;
977}
978
979static inline void
980iosapic_free (int index)
981{
982 memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0]));
983}
984
985static inline int
986iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver)
987{
988 int index;
989 unsigned int gsi_end, base, end;
990
991 /* check gsi range */
992 gsi_end = gsi_base + ((ver >> 16) & 0xff);
993 for (index = 0; index < NR_IOSAPICS; index++) {
994 if (!iosapic_lists[index].addr)
995 continue;
996
997 base = iosapic_lists[index].gsi_base;
998 end = base + iosapic_lists[index].num_rte - 1;
999
1000 if (gsi_end < base || end < gsi_base)
1001 continue; /* OK */
1002
1003 return -EBUSY;
1004 }
1005 return 0;
1006}
1007
1008static int
1009iosapic_delete_rte(unsigned int irq, unsigned int gsi)
1010{
1011 struct iosapic_rte_info *rte, *temp;
1012
1013 list_for_each_entry_safe(rte, temp, &iosapic_intr_info[irq].rtes,
1014 rte_list) {
1015 if (rte->iosapic->gsi_base + rte->rte_index == gsi) {
1016 if (rte->refcnt)
1017 return -EBUSY;
1018
1019 list_del(&rte->rte_list);
1020 kfree(rte);
1021 return 0;
1022 }
1023 }
1024
1025 return -EINVAL;
1026}
1027
1028int iosapic_init(unsigned long phys_addr, unsigned int gsi_base)
1029{
1030 int num_rte, err, index;
1031 unsigned int isa_irq, ver;
1032 char __iomem *addr;
1033 unsigned long flags;
1034
1035 spin_lock_irqsave(&iosapic_lock, flags);
1036 index = find_iosapic(gsi_base);
1037 if (index >= 0) {
1038 spin_unlock_irqrestore(&iosapic_lock, flags);
1039 return -EBUSY;
1040 }
1041
1042 addr = ioremap(phys_addr, 0);
1043 if (addr == NULL) {
1044 spin_unlock_irqrestore(&iosapic_lock, flags);
1045 return -ENOMEM;
1046 }
1047 ver = iosapic_version(addr);
1048 if ((err = iosapic_check_gsi_range(gsi_base, ver))) {
1049 iounmap(addr);
1050 spin_unlock_irqrestore(&iosapic_lock, flags);
1051 return err;
1052 }
1053
1054 /*
1055 * The MAX_REDIR register holds the highest input pin number
1056 * (starting from 0). We add 1 so that we can use it for
1057 * number of pins (= RTEs)
1058 */
1059 num_rte = ((ver >> 16) & 0xff) + 1;
1060
1061 index = iosapic_alloc();
1062 iosapic_lists[index].addr = addr;
1063 iosapic_lists[index].gsi_base = gsi_base;
1064 iosapic_lists[index].num_rte = num_rte;
1065#ifdef CONFIG_NUMA
1066 iosapic_lists[index].node = MAX_NUMNODES;
1067#endif
1068 spin_lock_init(&iosapic_lists[index].lock);
1069 spin_unlock_irqrestore(&iosapic_lock, flags);
1070
1071 if ((gsi_base == 0) && pcat_compat) {
1072 /*
1073 * Map the legacy ISA devices into the IOSAPIC data. Some of
1074 * these may get reprogrammed later on with data from the ACPI
1075 * Interrupt Source Override table.
1076 */
1077 for (isa_irq = 0; isa_irq < 16; ++isa_irq)
1078 iosapic_override_isa_irq(isa_irq, isa_irq,
1079 IOSAPIC_POL_HIGH,
1080 IOSAPIC_EDGE);
1081 }
1082 return 0;
1083}
1084
1085int iosapic_remove(unsigned int gsi_base)
1086{
1087 int i, irq, index, err = 0;
1088 unsigned long flags;
1089
1090 spin_lock_irqsave(&iosapic_lock, flags);
1091 index = find_iosapic(gsi_base);
1092 if (index < 0) {
1093 printk(KERN_WARNING "%s: No IOSAPIC for GSI base %u\n",
1094 __func__, gsi_base);
1095 goto out;
1096 }
1097
1098 if (iosapic_lists[index].rtes_inuse) {
1099 err = -EBUSY;
1100 printk(KERN_WARNING "%s: IOSAPIC for GSI base %u is busy\n",
1101 __func__, gsi_base);
1102 goto out;
1103 }
1104
1105 for (i = gsi_base; i < gsi_base + iosapic_lists[index].num_rte; i++) {
1106 irq = __gsi_to_irq(i);
1107 if (irq < 0)
1108 continue;
1109
1110 err = iosapic_delete_rte(irq, i);
1111 if (err)
1112 goto out;
1113 }
1114
1115 iounmap(iosapic_lists[index].addr);
1116 iosapic_free(index);
1117 out:
1118 spin_unlock_irqrestore(&iosapic_lock, flags);
1119 return err;
1120}
1121
1122#ifdef CONFIG_NUMA
1123void map_iosapic_to_node(unsigned int gsi_base, int node)
1124{
1125 int index;
1126
1127 index = find_iosapic(gsi_base);
1128 if (index < 0) {
1129 printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n",
1130 __func__, gsi_base);
1131 return;
1132 }
1133 iosapic_lists[index].node = node;
1134 return;
1135}
1136#endif