4 * Copyright (C) 1999 Intel Corp.
5 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
6 * Copyright (C) 2000-2002 J.I. Lee <jung-ik.lee@intel.com>
7 * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co.
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 * Copyright (C) 1999 VA Linux Systems
10 * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
12 * 00/04/19 D. Mosberger Rewritten to mirror more closely the x86 I/O
13 * APIC code. In particular, we now have separate
14 * handlers for edge and level triggered
16 * 00/10/27 Asit Mallick, Goutham Rao <goutham.rao@intel.com> IRQ vector
17 * allocation PCI to vector mapping, shared PCI
19 * 00/10/27 D. Mosberger Document things a bit more to make them more
20 * understandable. Clean up much of the old
22 * 01/07/27 J.I. Lee PCI irq routing, Platform/Legacy interrupts
23 * and fixes for ACPI S5(SoftOff) support.
24 * 02/01/23 J.I. Lee iosapic pgm fixes for PCI irq routing from _PRT
25 * 02/01/07 E. Focht <efocht@ess.nec.de> Redirectable interrupt
26 * vectors in iosapic_set_affinity(),
27 * initializations for /proc/irq/#/smp_affinity
28 * 02/04/02 P. Diefenbaugh Cleaned up ACPI PCI IRQ routing.
29 * 02/04/18 J.I. Lee bug fix in iosapic_init_pci_irq
30 * 02/04/30 J.I. Lee bug fix in find_iosapic to fix ACPI PCI IRQ to
31 * IOSAPIC mapping error
32 * 02/07/29 T. Kochi Allocate interrupt vectors dynamically
33 * 02/08/04 T. Kochi Cleaned up terminology (irq, global system
34 * interrupt, vector, etc.)
35 * 02/09/20 D. Mosberger Simplified by taking advantage of ACPI's
37 * 03/02/19 B. Helgaas Make pcat_compat system-wide, not per-IOSAPIC.
38 * Remove iosapic_address & gsi_base from
39 * external interfaces. Rationalize
40 * __init/__devinit attributes.
41 * 04/12/04 Ashok Raj <ashok.raj@intel.com> Intel Corporation 2004
42 * Updated to work with irq migration necessary
46 * Here is what the interrupt logic between a PCI device and the kernel looks
49 * (1) A PCI device raises one of the four interrupt pins (INTA, INTB, INTC,
50 * INTD). The device is uniquely identified by its bus-, and slot-number
51 * (the function number does not matter here because all functions share
52 * the same interrupt lines).
54 * (2) The motherboard routes the interrupt line to a pin on a IOSAPIC
55 * controller. Multiple interrupt lines may have to share the same
56 * IOSAPIC pin (if they're level triggered and use the same polarity).
57 * Each interrupt line has a unique Global System Interrupt (GSI) number
58 * which can be calculated as the sum of the controller's base GSI number
59 * and the IOSAPIC pin number to which the line connects.
61 * (3) The IOSAPIC uses an internal routing table entries (RTEs) to map the
62 * IOSAPIC pin into the IA-64 interrupt vector. This interrupt vector is then
65 * (4) The kernel recognizes an interrupt as an IRQ. The IRQ interface is
66 * used as architecture-independent interrupt handling mechanism in Linux.
67 * As an IRQ is a number, we have to have
68 * IA-64 interrupt vector number <-> IRQ number mapping. On smaller
69 * systems, we use one-to-one mapping between IA-64 vector and IRQ. A
70 * platform can implement platform_irq_to_vector(irq) and
71 * platform_local_vector_to_irq(vector) APIs to differentiate the mapping.
72 * Please see also include/asm-ia64/hw_irq.h for those APIs.
74 * To sum up, there are three levels of mappings involved:
76 * PCI pin -> global system interrupt (GSI) -> IA-64 vector <-> IRQ
78 * Note: The term "IRQ" is loosely used everywhere in Linux kernel to
79 * describeinterrupts. Now we use "IRQ" only for Linux IRQ's. ISA IRQ
80 * (isa_irq) is the only exception in this source code.
83 #include <linux/acpi.h>
84 #include <linux/init.h>
85 #include <linux/irq.h>
86 #include <linux/kernel.h>
87 #include <linux/list.h>
88 #include <linux/pci.h>
89 #include <linux/smp.h>
90 #include <linux/smp_lock.h>
91 #include <linux/string.h>
92 #include <linux/bootmem.h>
94 #include <asm/delay.h>
95 #include <asm/hw_irq.h>
97 #include <asm/iosapic.h>
98 #include <asm/machvec.h>
99 #include <asm/processor.h>
100 #include <asm/ptrace.h>
101 #include <asm/system.h>
103 #undef DEBUG_INTERRUPT_ROUTING
105 #ifdef DEBUG_INTERRUPT_ROUTING
106 #define DBG(fmt...) printk(fmt)
111 #define NR_PREALLOCATE_RTE_ENTRIES \
112 (PAGE_SIZE / sizeof(struct iosapic_rte_info))
113 #define RTE_PREALLOCATED (1)
115 static DEFINE_SPINLOCK(iosapic_lock
);
118 * These tables map IA-64 vectors to the IOSAPIC pin that generates this
122 struct iosapic_rte_info
{
123 struct list_head rte_list
; /* node in list of RTEs sharing the
125 char __iomem
*addr
; /* base address of IOSAPIC */
126 unsigned int gsi_base
; /* first GSI assigned to this
128 char rte_index
; /* IOSAPIC RTE index */
129 int refcnt
; /* reference counter */
130 unsigned int flags
; /* flags */
131 } ____cacheline_aligned
;
133 static struct iosapic_intr_info
{
134 struct list_head rtes
; /* RTEs using this vector (empty =>
135 * not an IOSAPIC interrupt) */
136 int count
; /* # of RTEs that shares this vector */
137 u32 low32
; /* current value of low word of
138 * Redirection table entry */
139 unsigned int dest
; /* destination CPU physical ID */
140 unsigned char dmode
: 3; /* delivery mode (see iosapic.h) */
141 unsigned char polarity
: 1; /* interrupt polarity
143 unsigned char trigger
: 1; /* trigger mode (see iosapic.h) */
144 } iosapic_intr_info
[IA64_NUM_VECTORS
];
146 static struct iosapic
{
147 char __iomem
*addr
; /* base address of IOSAPIC */
148 unsigned int gsi_base
; /* first GSI assigned to this
150 unsigned short num_rte
; /* # of RTEs on this IOSAPIC */
151 int rtes_inuse
; /* # of RTEs in use on this IOSAPIC */
153 unsigned short node
; /* numa node association via pxm */
155 } iosapic_lists
[NR_IOSAPICS
];
157 static unsigned char pcat_compat __devinitdata
; /* 8259 compatibility flag */
159 static int iosapic_kmalloc_ok
;
160 static LIST_HEAD(free_rte_list
);
163 * Find an IOSAPIC associated with a GSI
166 find_iosapic (unsigned int gsi
)
170 for (i
= 0; i
< NR_IOSAPICS
; i
++) {
171 if ((unsigned) (gsi
- iosapic_lists
[i
].gsi_base
) <
172 iosapic_lists
[i
].num_rte
)
180 _gsi_to_vector (unsigned int gsi
)
182 struct iosapic_intr_info
*info
;
183 struct iosapic_rte_info
*rte
;
185 for (info
= iosapic_intr_info
; info
<
186 iosapic_intr_info
+ IA64_NUM_VECTORS
; ++info
)
187 list_for_each_entry(rte
, &info
->rtes
, rte_list
)
188 if (rte
->gsi_base
+ rte
->rte_index
== gsi
)
189 return info
- iosapic_intr_info
;
194 * Translate GSI number to the corresponding IA-64 interrupt vector. If no
195 * entry exists, return -1.
198 gsi_to_vector (unsigned int gsi
)
200 return _gsi_to_vector(gsi
);
204 gsi_to_irq (unsigned int gsi
)
209 * XXX fix me: this assumes an identity mapping between IA-64 vector
210 * and Linux irq numbers...
212 spin_lock_irqsave(&iosapic_lock
, flags
);
214 irq
= _gsi_to_vector(gsi
);
216 spin_unlock_irqrestore(&iosapic_lock
, flags
);
221 static struct iosapic_rte_info
*gsi_vector_to_rte(unsigned int gsi
,
224 struct iosapic_rte_info
*rte
;
226 list_for_each_entry(rte
, &iosapic_intr_info
[vec
].rtes
, rte_list
)
227 if (rte
->gsi_base
+ rte
->rte_index
== gsi
)
233 set_rte (unsigned int gsi
, unsigned int vector
, unsigned int dest
, int mask
)
235 unsigned long pol
, trigger
, dmode
;
240 struct iosapic_rte_info
*rte
;
242 DBG(KERN_DEBUG
"IOSAPIC: routing vector %d to 0x%x\n", vector
, dest
);
244 rte
= gsi_vector_to_rte(gsi
, vector
);
246 return; /* not an IOSAPIC interrupt */
248 rte_index
= rte
->rte_index
;
250 pol
= iosapic_intr_info
[vector
].polarity
;
251 trigger
= iosapic_intr_info
[vector
].trigger
;
252 dmode
= iosapic_intr_info
[vector
].dmode
;
254 redir
= (dmode
== IOSAPIC_LOWEST_PRIORITY
) ? 1 : 0;
260 for (irq
= 0; irq
< NR_IRQS
; ++irq
)
261 if (irq_to_vector(irq
) == vector
) {
262 set_irq_affinity_info(irq
,
263 (int)(dest
& 0xffff),
270 low32
= ((pol
<< IOSAPIC_POLARITY_SHIFT
) |
271 (trigger
<< IOSAPIC_TRIGGER_SHIFT
) |
272 (dmode
<< IOSAPIC_DELIVERY_SHIFT
) |
273 ((mask
? 1 : 0) << IOSAPIC_MASK_SHIFT
) |
276 /* dest contains both id and eid */
277 high32
= (dest
<< IOSAPIC_DEST_SHIFT
);
279 iosapic_write(addr
, IOSAPIC_RTE_HIGH(rte_index
), high32
);
280 iosapic_write(addr
, IOSAPIC_RTE_LOW(rte_index
), low32
);
281 iosapic_intr_info
[vector
].low32
= low32
;
282 iosapic_intr_info
[vector
].dest
= dest
;
286 nop (unsigned int irq
)
292 mask_irq (unsigned int irq
)
298 ia64_vector vec
= irq_to_vector(irq
);
299 struct iosapic_rte_info
*rte
;
301 if (list_empty(&iosapic_intr_info
[vec
].rtes
))
302 return; /* not an IOSAPIC interrupt! */
304 spin_lock_irqsave(&iosapic_lock
, flags
);
306 /* set only the mask bit */
307 low32
= iosapic_intr_info
[vec
].low32
|= IOSAPIC_MASK
;
308 list_for_each_entry(rte
, &iosapic_intr_info
[vec
].rtes
,
311 rte_index
= rte
->rte_index
;
312 iosapic_write(addr
, IOSAPIC_RTE_LOW(rte_index
), low32
);
315 spin_unlock_irqrestore(&iosapic_lock
, flags
);
319 unmask_irq (unsigned int irq
)
325 ia64_vector vec
= irq_to_vector(irq
);
326 struct iosapic_rte_info
*rte
;
328 if (list_empty(&iosapic_intr_info
[vec
].rtes
))
329 return; /* not an IOSAPIC interrupt! */
331 spin_lock_irqsave(&iosapic_lock
, flags
);
333 low32
= iosapic_intr_info
[vec
].low32
&= ~IOSAPIC_MASK
;
334 list_for_each_entry(rte
, &iosapic_intr_info
[vec
].rtes
,
337 rte_index
= rte
->rte_index
;
338 iosapic_write(addr
, IOSAPIC_RTE_LOW(rte_index
), low32
);
341 spin_unlock_irqrestore(&iosapic_lock
, flags
);
346 iosapic_set_affinity (unsigned int irq
, cpumask_t mask
)
353 int redir
= (irq
& IA64_IRQ_REDIRECTED
) ? 1 : 0;
355 struct iosapic_rte_info
*rte
;
357 irq
&= (~IA64_IRQ_REDIRECTED
);
358 vec
= irq_to_vector(irq
);
360 if (cpus_empty(mask
))
363 dest
= cpu_physical_id(first_cpu(mask
));
365 if (list_empty(&iosapic_intr_info
[vec
].rtes
))
366 return; /* not an IOSAPIC interrupt */
368 set_irq_affinity_info(irq
, dest
, redir
);
370 /* dest contains both id and eid */
371 high32
= dest
<< IOSAPIC_DEST_SHIFT
;
373 spin_lock_irqsave(&iosapic_lock
, flags
);
375 low32
= iosapic_intr_info
[vec
].low32
&
376 ~(7 << IOSAPIC_DELIVERY_SHIFT
);
379 /* change delivery mode to lowest priority */
380 low32
|= (IOSAPIC_LOWEST_PRIORITY
<<
381 IOSAPIC_DELIVERY_SHIFT
);
383 /* change delivery mode to fixed */
384 low32
|= (IOSAPIC_FIXED
<< IOSAPIC_DELIVERY_SHIFT
);
386 iosapic_intr_info
[vec
].low32
= low32
;
387 iosapic_intr_info
[vec
].dest
= dest
;
388 list_for_each_entry(rte
, &iosapic_intr_info
[vec
].rtes
,
391 rte_index
= rte
->rte_index
;
392 iosapic_write(addr
, IOSAPIC_RTE_HIGH(rte_index
),
394 iosapic_write(addr
, IOSAPIC_RTE_LOW(rte_index
), low32
);
397 spin_unlock_irqrestore(&iosapic_lock
, flags
);
402 * Handlers for level-triggered interrupts.
406 iosapic_startup_level_irq (unsigned int irq
)
413 iosapic_end_level_irq (unsigned int irq
)
415 ia64_vector vec
= irq_to_vector(irq
);
416 struct iosapic_rte_info
*rte
;
418 move_native_irq(irq
);
419 list_for_each_entry(rte
, &iosapic_intr_info
[vec
].rtes
, rte_list
)
420 iosapic_eoi(rte
->addr
, vec
);
423 #define iosapic_shutdown_level_irq mask_irq
424 #define iosapic_enable_level_irq unmask_irq
425 #define iosapic_disable_level_irq mask_irq
426 #define iosapic_ack_level_irq nop
428 struct hw_interrupt_type irq_type_iosapic_level
= {
429 .name
= "IO-SAPIC-level",
430 .startup
= iosapic_startup_level_irq
,
431 .shutdown
= iosapic_shutdown_level_irq
,
432 .enable
= iosapic_enable_level_irq
,
433 .disable
= iosapic_disable_level_irq
,
434 .ack
= iosapic_ack_level_irq
,
435 .end
= iosapic_end_level_irq
,
436 .set_affinity
= iosapic_set_affinity
440 * Handlers for edge-triggered interrupts.
444 iosapic_startup_edge_irq (unsigned int irq
)
448 * IOSAPIC simply drops interrupts pended while the
449 * corresponding pin was masked, so we can't know if an
450 * interrupt is pending already. Let's hope not...
456 iosapic_ack_edge_irq (unsigned int irq
)
458 irq_desc_t
*idesc
= irq_desc
+ irq
;
460 move_native_irq(irq
);
462 * Once we have recorded IRQ_PENDING already, we can mask the
463 * interrupt for real. This prevents IRQ storms from unhandled
466 if ((idesc
->status
& (IRQ_PENDING
|IRQ_DISABLED
)) ==
467 (IRQ_PENDING
|IRQ_DISABLED
))
471 #define iosapic_enable_edge_irq unmask_irq
472 #define iosapic_disable_edge_irq nop
473 #define iosapic_end_edge_irq nop
475 struct hw_interrupt_type irq_type_iosapic_edge
= {
476 .name
= "IO-SAPIC-edge",
477 .startup
= iosapic_startup_edge_irq
,
478 .shutdown
= iosapic_disable_edge_irq
,
479 .enable
= iosapic_enable_edge_irq
,
480 .disable
= iosapic_disable_edge_irq
,
481 .ack
= iosapic_ack_edge_irq
,
482 .end
= iosapic_end_edge_irq
,
483 .set_affinity
= iosapic_set_affinity
487 iosapic_version (char __iomem
*addr
)
490 * IOSAPIC Version Register return 32 bit structure like:
492 * unsigned int version : 8;
493 * unsigned int reserved1 : 8;
494 * unsigned int max_redir : 8;
495 * unsigned int reserved2 : 8;
498 return iosapic_read(addr
, IOSAPIC_VERSION
);
501 static int iosapic_find_sharable_vector (unsigned long trigger
,
504 int i
, vector
= -1, min_count
= -1;
505 struct iosapic_intr_info
*info
;
508 * shared vectors for edge-triggered interrupts are not
511 if (trigger
== IOSAPIC_EDGE
)
514 for (i
= IA64_FIRST_DEVICE_VECTOR
; i
<= IA64_LAST_DEVICE_VECTOR
; i
++) {
515 info
= &iosapic_intr_info
[i
];
516 if (info
->trigger
== trigger
&& info
->polarity
== pol
&&
517 (info
->dmode
== IOSAPIC_FIXED
|| info
->dmode
==
518 IOSAPIC_LOWEST_PRIORITY
)) {
519 if (min_count
== -1 || info
->count
< min_count
) {
521 min_count
= info
->count
;
530 * if the given vector is already owned by other,
531 * assign a new vector for the other and make the vector available
534 iosapic_reassign_vector (int vector
)
538 if (!list_empty(&iosapic_intr_info
[vector
].rtes
)) {
539 new_vector
= assign_irq_vector(AUTO_ASSIGN
);
541 panic("%s: out of interrupt vectors!\n", __FUNCTION__
);
542 printk(KERN_INFO
"Reassigning vector %d to %d\n",
544 memcpy(&iosapic_intr_info
[new_vector
], &iosapic_intr_info
[vector
],
545 sizeof(struct iosapic_intr_info
));
546 INIT_LIST_HEAD(&iosapic_intr_info
[new_vector
].rtes
);
547 list_move(iosapic_intr_info
[vector
].rtes
.next
,
548 &iosapic_intr_info
[new_vector
].rtes
);
549 memset(&iosapic_intr_info
[vector
], 0,
550 sizeof(struct iosapic_intr_info
));
551 iosapic_intr_info
[vector
].low32
= IOSAPIC_MASK
;
552 INIT_LIST_HEAD(&iosapic_intr_info
[vector
].rtes
);
556 static struct iosapic_rte_info
*iosapic_alloc_rte (void)
559 struct iosapic_rte_info
*rte
;
560 int preallocated
= 0;
562 if (!iosapic_kmalloc_ok
&& list_empty(&free_rte_list
)) {
563 rte
= alloc_bootmem(sizeof(struct iosapic_rte_info
) *
564 NR_PREALLOCATE_RTE_ENTRIES
);
567 for (i
= 0; i
< NR_PREALLOCATE_RTE_ENTRIES
; i
++, rte
++)
568 list_add(&rte
->rte_list
, &free_rte_list
);
571 if (!list_empty(&free_rte_list
)) {
572 rte
= list_entry(free_rte_list
.next
, struct iosapic_rte_info
,
574 list_del(&rte
->rte_list
);
577 rte
= kmalloc(sizeof(struct iosapic_rte_info
), GFP_ATOMIC
);
582 memset(rte
, 0, sizeof(struct iosapic_rte_info
));
584 rte
->flags
|= RTE_PREALLOCATED
;
589 static void iosapic_free_rte (struct iosapic_rte_info
*rte
)
591 if (rte
->flags
& RTE_PREALLOCATED
)
592 list_add_tail(&rte
->rte_list
, &free_rte_list
);
597 static inline int vector_is_shared (int vector
)
599 return (iosapic_intr_info
[vector
].count
> 1);
603 register_intr (unsigned int gsi
, int vector
, unsigned char delivery
,
604 unsigned long polarity
, unsigned long trigger
)
607 struct hw_interrupt_type
*irq_type
;
610 unsigned long gsi_base
;
611 void __iomem
*iosapic_address
;
612 struct iosapic_rte_info
*rte
;
614 index
= find_iosapic(gsi
);
616 printk(KERN_WARNING
"%s: No IOSAPIC for GSI %u\n",
621 iosapic_address
= iosapic_lists
[index
].addr
;
622 gsi_base
= iosapic_lists
[index
].gsi_base
;
624 rte
= gsi_vector_to_rte(gsi
, vector
);
626 rte
= iosapic_alloc_rte();
628 printk(KERN_WARNING
"%s: cannot allocate memory\n",
633 rte_index
= gsi
- gsi_base
;
634 rte
->rte_index
= rte_index
;
635 rte
->addr
= iosapic_address
;
636 rte
->gsi_base
= gsi_base
;
638 list_add_tail(&rte
->rte_list
, &iosapic_intr_info
[vector
].rtes
);
639 iosapic_intr_info
[vector
].count
++;
640 iosapic_lists
[index
].rtes_inuse
++;
642 else if (vector_is_shared(vector
)) {
643 struct iosapic_intr_info
*info
= &iosapic_intr_info
[vector
];
644 if (info
->trigger
!= trigger
|| info
->polarity
!= polarity
) {
646 "%s: cannot override the interrupt\n",
652 iosapic_intr_info
[vector
].polarity
= polarity
;
653 iosapic_intr_info
[vector
].dmode
= delivery
;
654 iosapic_intr_info
[vector
].trigger
= trigger
;
656 if (trigger
== IOSAPIC_EDGE
)
657 irq_type
= &irq_type_iosapic_edge
;
659 irq_type
= &irq_type_iosapic_level
;
661 idesc
= irq_desc
+ vector
;
662 if (idesc
->chip
!= irq_type
) {
663 if (idesc
->chip
!= &no_irq_type
)
665 "%s: changing vector %d from %s to %s\n",
666 __FUNCTION__
, vector
,
667 idesc
->chip
->name
, irq_type
->name
);
668 idesc
->chip
= irq_type
;
674 get_target_cpu (unsigned int gsi
, int vector
)
678 extern int cpe_vector
;
681 * In case of vector shared by multiple RTEs, all RTEs that
682 * share the vector need to use the same destination CPU.
684 if (!list_empty(&iosapic_intr_info
[vector
].rtes
))
685 return iosapic_intr_info
[vector
].dest
;
688 * If the platform supports redirection via XTP, let it
689 * distribute interrupts.
691 if (smp_int_redirect
& SMP_IRQ_REDIRECTION
)
692 return cpu_physical_id(smp_processor_id());
695 * Some interrupts (ACPI SCI, for instance) are registered
696 * before the BSP is marked as online.
698 if (!cpu_online(smp_processor_id()))
699 return cpu_physical_id(smp_processor_id());
702 if (cpe_vector
> 0 && vector
== IA64_CPEP_VECTOR
)
703 return get_cpei_target_cpu();
708 int num_cpus
, cpu_index
, iosapic_index
, numa_cpu
, i
= 0;
711 iosapic_index
= find_iosapic(gsi
);
712 if (iosapic_index
< 0 ||
713 iosapic_lists
[iosapic_index
].node
== MAX_NUMNODES
)
714 goto skip_numa_setup
;
716 cpu_mask
= node_to_cpumask(iosapic_lists
[iosapic_index
].node
);
718 for_each_cpu_mask(numa_cpu
, cpu_mask
) {
719 if (!cpu_online(numa_cpu
))
720 cpu_clear(numa_cpu
, cpu_mask
);
723 num_cpus
= cpus_weight(cpu_mask
);
726 goto skip_numa_setup
;
728 /* Use vector assignment to distribute across cpus in node */
729 cpu_index
= vector
% num_cpus
;
731 for (numa_cpu
= first_cpu(cpu_mask
) ; i
< cpu_index
; i
++)
732 numa_cpu
= next_cpu(numa_cpu
, cpu_mask
);
734 if (numa_cpu
!= NR_CPUS
)
735 return cpu_physical_id(numa_cpu
);
740 * Otherwise, round-robin interrupt vectors across all the
741 * processors. (It'd be nice if we could be smarter in the
745 if (++cpu
>= NR_CPUS
)
747 } while (!cpu_online(cpu
));
749 return cpu_physical_id(cpu
);
750 #else /* CONFIG_SMP */
751 return cpu_physical_id(smp_processor_id());
756 * ACPI can describe IOSAPIC interrupts via static tables and namespace
757 * methods. This provides an interface to register those interrupts and
758 * program the IOSAPIC RTE.
761 iosapic_register_intr (unsigned int gsi
,
762 unsigned long polarity
, unsigned long trigger
)
764 int vector
, mask
= 1, err
;
767 struct iosapic_rte_info
*rte
;
771 * If this GSI has already been registered (i.e., it's a
772 * shared interrupt, or we lost a race to register it),
773 * don't touch the RTE.
775 spin_lock_irqsave(&iosapic_lock
, flags
);
777 vector
= gsi_to_vector(gsi
);
779 rte
= gsi_vector_to_rte(gsi
, vector
);
781 spin_unlock_irqrestore(&iosapic_lock
, flags
);
785 spin_unlock_irqrestore(&iosapic_lock
, flags
);
787 /* If vector is running out, we try to find a sharable vector */
788 vector
= assign_irq_vector(AUTO_ASSIGN
);
790 vector
= iosapic_find_sharable_vector(trigger
, polarity
);
795 spin_lock_irqsave(&irq_desc
[vector
].lock
, flags
);
796 spin_lock(&iosapic_lock
);
798 if (gsi_to_vector(gsi
) > 0) {
799 if (list_empty(&iosapic_intr_info
[vector
].rtes
))
800 free_irq_vector(vector
);
801 spin_unlock(&iosapic_lock
);
802 spin_unlock_irqrestore(&irq_desc
[vector
].lock
,
807 dest
= get_target_cpu(gsi
, vector
);
808 err
= register_intr(gsi
, vector
, IOSAPIC_LOWEST_PRIORITY
,
811 spin_unlock(&iosapic_lock
);
812 spin_unlock_irqrestore(&irq_desc
[vector
].lock
,
818 * If the vector is shared and already unmasked for
819 * other interrupt sources, don't mask it.
821 low32
= iosapic_intr_info
[vector
].low32
;
822 if (vector_is_shared(vector
) && !(low32
& IOSAPIC_MASK
))
824 set_rte(gsi
, vector
, dest
, mask
);
826 spin_unlock(&iosapic_lock
);
827 spin_unlock_irqrestore(&irq_desc
[vector
].lock
, flags
);
829 printk(KERN_INFO
"GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n",
830 gsi
, (trigger
== IOSAPIC_EDGE
? "edge" : "level"),
831 (polarity
== IOSAPIC_POL_HIGH
? "high" : "low"),
832 cpu_logical_id(dest
), dest
, vector
);
838 iosapic_unregister_intr (unsigned int gsi
)
841 int irq
, vector
, index
;
844 unsigned long trigger
, polarity
;
846 struct iosapic_rte_info
*rte
;
849 * If the irq associated with the gsi is not found,
850 * iosapic_unregister_intr() is unbalanced. We need to check
851 * this again after getting locks.
853 irq
= gsi_to_irq(gsi
);
855 printk(KERN_ERR
"iosapic_unregister_intr(%u) unbalanced\n",
860 vector
= irq_to_vector(irq
);
862 idesc
= irq_desc
+ irq
;
863 spin_lock_irqsave(&idesc
->lock
, flags
);
864 spin_lock(&iosapic_lock
);
866 if ((rte
= gsi_vector_to_rte(gsi
, vector
)) == NULL
) {
868 "iosapic_unregister_intr(%u) unbalanced\n",
874 if (--rte
->refcnt
> 0)
877 /* Mask the interrupt */
878 low32
= iosapic_intr_info
[vector
].low32
| IOSAPIC_MASK
;
879 iosapic_write(rte
->addr
, IOSAPIC_RTE_LOW(rte
->rte_index
),
882 /* Remove the rte entry from the list */
883 list_del(&rte
->rte_list
);
884 iosapic_intr_info
[vector
].count
--;
885 iosapic_free_rte(rte
);
886 index
= find_iosapic(gsi
);
887 iosapic_lists
[index
].rtes_inuse
--;
888 WARN_ON(iosapic_lists
[index
].rtes_inuse
< 0);
890 trigger
= iosapic_intr_info
[vector
].trigger
;
891 polarity
= iosapic_intr_info
[vector
].polarity
;
892 dest
= iosapic_intr_info
[vector
].dest
;
894 "GSI %u (%s, %s) -> CPU %d (0x%04x)"
895 " vector %d unregistered\n",
896 gsi
, (trigger
== IOSAPIC_EDGE
? "edge" : "level"),
897 (polarity
== IOSAPIC_POL_HIGH
? "high" : "low"),
898 cpu_logical_id(dest
), dest
, vector
);
900 if (list_empty(&iosapic_intr_info
[vector
].rtes
)) {
902 BUG_ON(iosapic_intr_info
[vector
].count
);
904 /* Clear the interrupt controller descriptor */
905 idesc
->chip
= &no_irq_type
;
907 /* Clear the interrupt information */
908 memset(&iosapic_intr_info
[vector
], 0,
909 sizeof(struct iosapic_intr_info
));
910 iosapic_intr_info
[vector
].low32
|= IOSAPIC_MASK
;
911 INIT_LIST_HEAD(&iosapic_intr_info
[vector
].rtes
);
915 "interrupt handlers still exist on"
920 /* Free the interrupt vector */
921 free_irq_vector(vector
);
925 spin_unlock(&iosapic_lock
);
926 spin_unlock_irqrestore(&idesc
->lock
, flags
);
930 * ACPI calls this when it finds an entry for a platform interrupt.
933 iosapic_register_platform_intr (u32 int_type
, unsigned int gsi
,
934 int iosapic_vector
, u16 eid
, u16 id
,
935 unsigned long polarity
, unsigned long trigger
)
937 static const char * const name
[] = {"unknown", "PMI", "INIT", "CPEI"};
938 unsigned char delivery
;
939 int vector
, mask
= 0;
940 unsigned int dest
= ((id
<< 8) | eid
) & 0xffff;
943 case ACPI_INTERRUPT_PMI
:
944 vector
= iosapic_vector
;
946 * since PMI vector is alloc'd by FW(ACPI) not by kernel,
947 * we need to make sure the vector is available
949 iosapic_reassign_vector(vector
);
950 delivery
= IOSAPIC_PMI
;
952 case ACPI_INTERRUPT_INIT
:
953 vector
= assign_irq_vector(AUTO_ASSIGN
);
955 panic("%s: out of interrupt vectors!\n", __FUNCTION__
);
956 delivery
= IOSAPIC_INIT
;
958 case ACPI_INTERRUPT_CPEI
:
959 vector
= IA64_CPE_VECTOR
;
960 delivery
= IOSAPIC_LOWEST_PRIORITY
;
964 printk(KERN_ERR
"%s: invalid int type 0x%x\n", __FUNCTION__
,
969 register_intr(gsi
, vector
, delivery
, polarity
, trigger
);
972 "PLATFORM int %s (0x%x): GSI %u (%s, %s) -> CPU %d (0x%04x)"
974 int_type
< ARRAY_SIZE(name
) ? name
[int_type
] : "unknown",
975 int_type
, gsi
, (trigger
== IOSAPIC_EDGE
? "edge" : "level"),
976 (polarity
== IOSAPIC_POL_HIGH
? "high" : "low"),
977 cpu_logical_id(dest
), dest
, vector
);
979 set_rte(gsi
, vector
, dest
, mask
);
984 * ACPI calls this when it finds an entry for a legacy ISA IRQ override.
987 iosapic_override_isa_irq (unsigned int isa_irq
, unsigned int gsi
,
988 unsigned long polarity
,
989 unsigned long trigger
)
992 unsigned int dest
= cpu_physical_id(smp_processor_id());
994 vector
= isa_irq_to_vector(isa_irq
);
996 register_intr(gsi
, vector
, IOSAPIC_LOWEST_PRIORITY
, polarity
, trigger
);
998 DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n",
999 isa_irq
, gsi
, trigger
== IOSAPIC_EDGE
? "edge" : "level",
1000 polarity
== IOSAPIC_POL_HIGH
? "high" : "low",
1001 cpu_logical_id(dest
), dest
, vector
);
1003 set_rte(gsi
, vector
, dest
, 1);
1007 iosapic_system_init (int system_pcat_compat
)
1011 for (vector
= 0; vector
< IA64_NUM_VECTORS
; ++vector
) {
1012 iosapic_intr_info
[vector
].low32
= IOSAPIC_MASK
;
1013 /* mark as unused */
1014 INIT_LIST_HEAD(&iosapic_intr_info
[vector
].rtes
);
1017 pcat_compat
= system_pcat_compat
;
1020 * Disable the compatibility mode interrupts (8259 style),
1021 * needs IN/OUT support enabled.
1024 "%s: Disabling PC-AT compatible 8259 interrupts\n",
1032 iosapic_alloc (void)
1036 for (index
= 0; index
< NR_IOSAPICS
; index
++)
1037 if (!iosapic_lists
[index
].addr
)
1040 printk(KERN_WARNING
"%s: failed to allocate iosapic\n", __FUNCTION__
);
1045 iosapic_free (int index
)
1047 memset(&iosapic_lists
[index
], 0, sizeof(iosapic_lists
[0]));
1051 iosapic_check_gsi_range (unsigned int gsi_base
, unsigned int ver
)
1054 unsigned int gsi_end
, base
, end
;
1056 /* check gsi range */
1057 gsi_end
= gsi_base
+ ((ver
>> 16) & 0xff);
1058 for (index
= 0; index
< NR_IOSAPICS
; index
++) {
1059 if (!iosapic_lists
[index
].addr
)
1062 base
= iosapic_lists
[index
].gsi_base
;
1063 end
= base
+ iosapic_lists
[index
].num_rte
- 1;
1065 if (gsi_end
< base
|| end
< gsi_base
)
1074 iosapic_init (unsigned long phys_addr
, unsigned int gsi_base
)
1076 int num_rte
, err
, index
;
1077 unsigned int isa_irq
, ver
;
1079 unsigned long flags
;
1081 spin_lock_irqsave(&iosapic_lock
, flags
);
1083 addr
= ioremap(phys_addr
, 0);
1084 ver
= iosapic_version(addr
);
1086 if ((err
= iosapic_check_gsi_range(gsi_base
, ver
))) {
1088 spin_unlock_irqrestore(&iosapic_lock
, flags
);
1093 * The MAX_REDIR register holds the highest input pin
1094 * number (starting from 0).
1095 * We add 1 so that we can use it for number of pins (= RTEs)
1097 num_rte
= ((ver
>> 16) & 0xff) + 1;
1099 index
= iosapic_alloc();
1100 iosapic_lists
[index
].addr
= addr
;
1101 iosapic_lists
[index
].gsi_base
= gsi_base
;
1102 iosapic_lists
[index
].num_rte
= num_rte
;
1104 iosapic_lists
[index
].node
= MAX_NUMNODES
;
1107 spin_unlock_irqrestore(&iosapic_lock
, flags
);
1109 if ((gsi_base
== 0) && pcat_compat
) {
1111 * Map the legacy ISA devices into the IOSAPIC data. Some of
1112 * these may get reprogrammed later on with data from the ACPI
1113 * Interrupt Source Override table.
1115 for (isa_irq
= 0; isa_irq
< 16; ++isa_irq
)
1116 iosapic_override_isa_irq(isa_irq
, isa_irq
,
1123 #ifdef CONFIG_HOTPLUG
1125 iosapic_remove (unsigned int gsi_base
)
1128 unsigned long flags
;
1130 spin_lock_irqsave(&iosapic_lock
, flags
);
1132 index
= find_iosapic(gsi_base
);
1134 printk(KERN_WARNING
"%s: No IOSAPIC for GSI base %u\n",
1135 __FUNCTION__
, gsi_base
);
1139 if (iosapic_lists
[index
].rtes_inuse
) {
1142 "%s: IOSAPIC for GSI base %u is busy\n",
1143 __FUNCTION__
, gsi_base
);
1147 iounmap(iosapic_lists
[index
].addr
);
1148 iosapic_free(index
);
1151 spin_unlock_irqrestore(&iosapic_lock
, flags
);
1154 #endif /* CONFIG_HOTPLUG */
1158 map_iosapic_to_node(unsigned int gsi_base
, int node
)
1162 index
= find_iosapic(gsi_base
);
1164 printk(KERN_WARNING
"%s: No IOSAPIC for GSI %u\n",
1165 __FUNCTION__
, gsi_base
);
1168 iosapic_lists
[index
].node
= node
;
1173 static int __init
iosapic_enable_kmalloc (void)
1175 iosapic_kmalloc_ok
= 1;
1178 core_initcall (iosapic_enable_kmalloc
);