Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
[linux-2.6] / arch / ia64 / kernel / iosapic.c
1 /*
2  * I/O SAPIC support.
3  *
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>
11  *
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
15  *                              interrupts.
16  * 00/10/27     Asit Mallick, Goutham Rao <goutham.rao@intel.com> IRQ vector
17  *                              allocation PCI to vector mapping, shared PCI
18  *                              interrupts.
19  * 00/10/27     D. Mosberger    Document things a bit more to make them more
20  *                              understandable.  Clean up much of the old
21  *                              IOSAPIC cruft.
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
36  *                              pci_irq code.
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
43  *                              for CPU Hotplug
44  */
45 /*
46  * Here is what the interrupt logic between a PCI device and the kernel looks
47  * like:
48  *
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).
53  *
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.
60  *
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
63  * sent to the CPU.
64  *
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.
73  *
74  * To sum up, there are three levels of mappings involved:
75  *
76  *      PCI pin -> global system interrupt (GSI) -> IA-64 vector <-> IRQ
77  *
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.
81  */
82
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>
93
94 #include <asm/delay.h>
95 #include <asm/hw_irq.h>
96 #include <asm/io.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>
102
103 #undef DEBUG_INTERRUPT_ROUTING
104
105 #ifdef DEBUG_INTERRUPT_ROUTING
106 #define DBG(fmt...)     printk(fmt)
107 #else
108 #define DBG(fmt...)
109 #endif
110
111 #define NR_PREALLOCATE_RTE_ENTRIES \
112         (PAGE_SIZE / sizeof(struct iosapic_rte_info))
113 #define RTE_PREALLOCATED        (1)
114
115 static DEFINE_SPINLOCK(iosapic_lock);
116
117 /*
118  * These tables map IA-64 vectors to the IOSAPIC pin that generates this
119  * vector.
120  */
121
122 struct iosapic_rte_info {
123         struct list_head rte_list;      /* node in list of RTEs sharing the
124                                          * same vector */
125         char __iomem    *addr;          /* base address of IOSAPIC */
126         unsigned int    gsi_base;       /* first GSI assigned to this
127                                          * IOSAPIC */
128         char            rte_index;      /* IOSAPIC RTE index */
129         int             refcnt;         /* reference counter */
130         unsigned int    flags;          /* flags */
131 } ____cacheline_aligned;
132
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
142                                          * (see iosapic.h) */
143         unsigned char   trigger : 1;    /* trigger mode (see iosapic.h) */
144 } iosapic_intr_info[IA64_NUM_VECTORS];
145
146 static struct iosapic {
147         char __iomem    *addr;          /* base address of IOSAPIC */
148         unsigned int    gsi_base;       /* first GSI assigned to this
149                                          * IOSAPIC */
150         unsigned short  num_rte;        /* # of RTEs on this IOSAPIC */
151         int             rtes_inuse;     /* # of RTEs in use on this IOSAPIC */
152 #ifdef CONFIG_NUMA
153         unsigned short  node;           /* numa node association via pxm */
154 #endif
155 } iosapic_lists[NR_IOSAPICS];
156
157 static unsigned char pcat_compat __devinitdata; /* 8259 compatibility flag */
158
159 static int iosapic_kmalloc_ok;
160 static LIST_HEAD(free_rte_list);
161
162 /*
163  * Find an IOSAPIC associated with a GSI
164  */
165 static inline int
166 find_iosapic (unsigned int gsi)
167 {
168         int i;
169
170         for (i = 0; i < NR_IOSAPICS; i++) {
171                 if ((unsigned) (gsi - iosapic_lists[i].gsi_base) <
172                     iosapic_lists[i].num_rte)
173                         return i;
174         }
175
176         return -1;
177 }
178
179 static inline int
180 _gsi_to_vector (unsigned int gsi)
181 {
182         struct iosapic_intr_info *info;
183         struct iosapic_rte_info *rte;
184
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;
190         return -1;
191 }
192
193 /*
194  * Translate GSI number to the corresponding IA-64 interrupt vector.  If no
195  * entry exists, return -1.
196  */
197 inline int
198 gsi_to_vector (unsigned int gsi)
199 {
200         return _gsi_to_vector(gsi);
201 }
202
203 int
204 gsi_to_irq (unsigned int gsi)
205 {
206         unsigned long flags;
207         int irq;
208         /*
209          * XXX fix me: this assumes an identity mapping between IA-64 vector
210          * and Linux irq numbers...
211          */
212         spin_lock_irqsave(&iosapic_lock, flags);
213         {
214                 irq = _gsi_to_vector(gsi);
215         }
216         spin_unlock_irqrestore(&iosapic_lock, flags);
217
218         return irq;
219 }
220
221 static struct iosapic_rte_info *gsi_vector_to_rte(unsigned int gsi,
222                                                   unsigned int vec)
223 {
224         struct iosapic_rte_info *rte;
225
226         list_for_each_entry(rte, &iosapic_intr_info[vec].rtes, rte_list)
227                 if (rte->gsi_base + rte->rte_index == gsi)
228                         return rte;
229         return NULL;
230 }
231
232 static void
233 set_rte (unsigned int gsi, unsigned int vector, unsigned int dest, int mask)
234 {
235         unsigned long pol, trigger, dmode;
236         u32 low32, high32;
237         char __iomem *addr;
238         int rte_index;
239         char redir;
240         struct iosapic_rte_info *rte;
241
242         DBG(KERN_DEBUG"IOSAPIC: routing vector %d to 0x%x\n", vector, dest);
243
244         rte = gsi_vector_to_rte(gsi, vector);
245         if (!rte)
246                 return;         /* not an IOSAPIC interrupt */
247
248         rte_index = rte->rte_index;
249         addr    = rte->addr;
250         pol     = iosapic_intr_info[vector].polarity;
251         trigger = iosapic_intr_info[vector].trigger;
252         dmode   = iosapic_intr_info[vector].dmode;
253
254         redir = (dmode == IOSAPIC_LOWEST_PRIORITY) ? 1 : 0;
255
256 #ifdef CONFIG_SMP
257         {
258                 unsigned int irq;
259
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),
264                                                       redir);
265                                 break;
266                         }
267         }
268 #endif
269
270         low32 = ((pol << IOSAPIC_POLARITY_SHIFT) |
271                  (trigger << IOSAPIC_TRIGGER_SHIFT) |
272                  (dmode << IOSAPIC_DELIVERY_SHIFT) |
273                  ((mask ? 1 : 0) << IOSAPIC_MASK_SHIFT) |
274                  vector);
275
276         /* dest contains both id and eid */
277         high32 = (dest << IOSAPIC_DEST_SHIFT);
278
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;
283 }
284
285 static void
286 nop (unsigned int irq)
287 {
288         /* do nothing... */
289 }
290
291
292 #ifdef CONFIG_KEXEC
293 void
294 kexec_disable_iosapic(void)
295 {
296         struct iosapic_intr_info *info;
297         struct iosapic_rte_info *rte;
298         u8 vec = 0;
299         for (info = iosapic_intr_info; info <
300                         iosapic_intr_info + IA64_NUM_VECTORS; ++info, ++vec) {
301                 list_for_each_entry(rte, &info->rtes,
302                                 rte_list) {
303                         iosapic_write(rte->addr,
304                                         IOSAPIC_RTE_LOW(rte->rte_index),
305                                         IOSAPIC_MASK|vec);
306                         iosapic_eoi(rte->addr, vec);
307                 }
308         }
309 }
310 #endif
311
312 static void
313 mask_irq (unsigned int irq)
314 {
315         unsigned long flags;
316         char __iomem *addr;
317         u32 low32;
318         int rte_index;
319         ia64_vector vec = irq_to_vector(irq);
320         struct iosapic_rte_info *rte;
321
322         if (list_empty(&iosapic_intr_info[vec].rtes))
323                 return;                 /* not an IOSAPIC interrupt! */
324
325         spin_lock_irqsave(&iosapic_lock, flags);
326         {
327                 /* set only the mask bit */
328                 low32 = iosapic_intr_info[vec].low32 |= IOSAPIC_MASK;
329                 list_for_each_entry(rte, &iosapic_intr_info[vec].rtes,
330                                     rte_list) {
331                         addr = rte->addr;
332                         rte_index = rte->rte_index;
333                         iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32);
334                 }
335         }
336         spin_unlock_irqrestore(&iosapic_lock, flags);
337 }
338
339 static void
340 unmask_irq (unsigned int irq)
341 {
342         unsigned long flags;
343         char __iomem *addr;
344         u32 low32;
345         int rte_index;
346         ia64_vector vec = irq_to_vector(irq);
347         struct iosapic_rte_info *rte;
348
349         if (list_empty(&iosapic_intr_info[vec].rtes))
350                 return;                 /* not an IOSAPIC interrupt! */
351
352         spin_lock_irqsave(&iosapic_lock, flags);
353         {
354                 low32 = iosapic_intr_info[vec].low32 &= ~IOSAPIC_MASK;
355                 list_for_each_entry(rte, &iosapic_intr_info[vec].rtes,
356                                     rte_list) {
357                         addr = rte->addr;
358                         rte_index = rte->rte_index;
359                         iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32);
360                 }
361         }
362         spin_unlock_irqrestore(&iosapic_lock, flags);
363 }
364
365
366 static void
367 iosapic_set_affinity (unsigned int irq, cpumask_t mask)
368 {
369 #ifdef CONFIG_SMP
370         unsigned long flags;
371         u32 high32, low32;
372         int dest, rte_index;
373         char __iomem *addr;
374         int redir = (irq & IA64_IRQ_REDIRECTED) ? 1 : 0;
375         ia64_vector vec;
376         struct iosapic_rte_info *rte;
377
378         irq &= (~IA64_IRQ_REDIRECTED);
379         vec = irq_to_vector(irq);
380
381         if (cpus_empty(mask))
382                 return;
383
384         dest = cpu_physical_id(first_cpu(mask));
385
386         if (list_empty(&iosapic_intr_info[vec].rtes))
387                 return;                 /* not an IOSAPIC interrupt */
388
389         set_irq_affinity_info(irq, dest, redir);
390
391         /* dest contains both id and eid */
392         high32 = dest << IOSAPIC_DEST_SHIFT;
393
394         spin_lock_irqsave(&iosapic_lock, flags);
395         {
396                 low32 = iosapic_intr_info[vec].low32 &
397                         ~(7 << IOSAPIC_DELIVERY_SHIFT);
398
399                 if (redir)
400                         /* change delivery mode to lowest priority */
401                         low32 |= (IOSAPIC_LOWEST_PRIORITY <<
402                                   IOSAPIC_DELIVERY_SHIFT);
403                 else
404                         /* change delivery mode to fixed */
405                         low32 |= (IOSAPIC_FIXED << IOSAPIC_DELIVERY_SHIFT);
406
407                 iosapic_intr_info[vec].low32 = low32;
408                 iosapic_intr_info[vec].dest = dest;
409                 list_for_each_entry(rte, &iosapic_intr_info[vec].rtes,
410                                     rte_list) {
411                         addr = rte->addr;
412                         rte_index = rte->rte_index;
413                         iosapic_write(addr, IOSAPIC_RTE_HIGH(rte_index),
414                                       high32);
415                         iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32);
416                 }
417         }
418         spin_unlock_irqrestore(&iosapic_lock, flags);
419 #endif
420 }
421
422 /*
423  * Handlers for level-triggered interrupts.
424  */
425
426 static unsigned int
427 iosapic_startup_level_irq (unsigned int irq)
428 {
429         unmask_irq(irq);
430         return 0;
431 }
432
433 static void
434 iosapic_end_level_irq (unsigned int irq)
435 {
436         ia64_vector vec = irq_to_vector(irq);
437         struct iosapic_rte_info *rte;
438
439         move_native_irq(irq);
440         list_for_each_entry(rte, &iosapic_intr_info[vec].rtes, rte_list)
441                 iosapic_eoi(rte->addr, vec);
442 }
443
444 #define iosapic_shutdown_level_irq      mask_irq
445 #define iosapic_enable_level_irq        unmask_irq
446 #define iosapic_disable_level_irq       mask_irq
447 #define iosapic_ack_level_irq           nop
448
449 struct hw_interrupt_type irq_type_iosapic_level = {
450         .name =         "IO-SAPIC-level",
451         .startup =      iosapic_startup_level_irq,
452         .shutdown =     iosapic_shutdown_level_irq,
453         .enable =       iosapic_enable_level_irq,
454         .disable =      iosapic_disable_level_irq,
455         .ack =          iosapic_ack_level_irq,
456         .end =          iosapic_end_level_irq,
457         .set_affinity = iosapic_set_affinity
458 };
459
460 /*
461  * Handlers for edge-triggered interrupts.
462  */
463
464 static unsigned int
465 iosapic_startup_edge_irq (unsigned int irq)
466 {
467         unmask_irq(irq);
468         /*
469          * IOSAPIC simply drops interrupts pended while the
470          * corresponding pin was masked, so we can't know if an
471          * interrupt is pending already.  Let's hope not...
472          */
473         return 0;
474 }
475
476 static void
477 iosapic_ack_edge_irq (unsigned int irq)
478 {
479         irq_desc_t *idesc = irq_desc + irq;
480
481         move_native_irq(irq);
482         /*
483          * Once we have recorded IRQ_PENDING already, we can mask the
484          * interrupt for real. This prevents IRQ storms from unhandled
485          * devices.
486          */
487         if ((idesc->status & (IRQ_PENDING|IRQ_DISABLED)) ==
488             (IRQ_PENDING|IRQ_DISABLED))
489                 mask_irq(irq);
490 }
491
492 #define iosapic_enable_edge_irq         unmask_irq
493 #define iosapic_disable_edge_irq        nop
494 #define iosapic_end_edge_irq            nop
495
496 struct hw_interrupt_type irq_type_iosapic_edge = {
497         .name =         "IO-SAPIC-edge",
498         .startup =      iosapic_startup_edge_irq,
499         .shutdown =     iosapic_disable_edge_irq,
500         .enable =       iosapic_enable_edge_irq,
501         .disable =      iosapic_disable_edge_irq,
502         .ack =          iosapic_ack_edge_irq,
503         .end =          iosapic_end_edge_irq,
504         .set_affinity = iosapic_set_affinity
505 };
506
507 unsigned int
508 iosapic_version (char __iomem *addr)
509 {
510         /*
511          * IOSAPIC Version Register return 32 bit structure like:
512          * {
513          *      unsigned int version   : 8;
514          *      unsigned int reserved1 : 8;
515          *      unsigned int max_redir : 8;
516          *      unsigned int reserved2 : 8;
517          * }
518          */
519         return iosapic_read(addr, IOSAPIC_VERSION);
520 }
521
522 static int iosapic_find_sharable_vector (unsigned long trigger,
523                                          unsigned long pol)
524 {
525         int i, vector = -1, min_count = -1;
526         struct iosapic_intr_info *info;
527
528         /*
529          * shared vectors for edge-triggered interrupts are not
530          * supported yet
531          */
532         if (trigger == IOSAPIC_EDGE)
533                 return -1;
534
535         for (i = IA64_FIRST_DEVICE_VECTOR; i <= IA64_LAST_DEVICE_VECTOR; i++) {
536                 info = &iosapic_intr_info[i];
537                 if (info->trigger == trigger && info->polarity == pol &&
538                     (info->dmode == IOSAPIC_FIXED || info->dmode ==
539                      IOSAPIC_LOWEST_PRIORITY)) {
540                         if (min_count == -1 || info->count < min_count) {
541                                 vector = i;
542                                 min_count = info->count;
543                         }
544                 }
545         }
546
547         return vector;
548 }
549
550 /*
551  * if the given vector is already owned by other,
552  *  assign a new vector for the other and make the vector available
553  */
554 static void __init
555 iosapic_reassign_vector (int vector)
556 {
557         int new_vector;
558
559         if (!list_empty(&iosapic_intr_info[vector].rtes)) {
560                 new_vector = assign_irq_vector(AUTO_ASSIGN);
561                 if (new_vector < 0)
562                         panic("%s: out of interrupt vectors!\n", __FUNCTION__);
563                 printk(KERN_INFO "Reassigning vector %d to %d\n",
564                        vector, new_vector);
565                 memcpy(&iosapic_intr_info[new_vector], &iosapic_intr_info[vector],
566                        sizeof(struct iosapic_intr_info));
567                 INIT_LIST_HEAD(&iosapic_intr_info[new_vector].rtes);
568                 list_move(iosapic_intr_info[vector].rtes.next,
569                           &iosapic_intr_info[new_vector].rtes);
570                 memset(&iosapic_intr_info[vector], 0,
571                        sizeof(struct iosapic_intr_info));
572                 iosapic_intr_info[vector].low32 = IOSAPIC_MASK;
573                 INIT_LIST_HEAD(&iosapic_intr_info[vector].rtes);
574         }
575 }
576
577 static struct iosapic_rte_info *iosapic_alloc_rte (void)
578 {
579         int i;
580         struct iosapic_rte_info *rte;
581         int preallocated = 0;
582
583         if (!iosapic_kmalloc_ok && list_empty(&free_rte_list)) {
584                 rte = alloc_bootmem(sizeof(struct iosapic_rte_info) *
585                                     NR_PREALLOCATE_RTE_ENTRIES);
586                 if (!rte)
587                         return NULL;
588                 for (i = 0; i < NR_PREALLOCATE_RTE_ENTRIES; i++, rte++)
589                         list_add(&rte->rte_list, &free_rte_list);
590         }
591
592         if (!list_empty(&free_rte_list)) {
593                 rte = list_entry(free_rte_list.next, struct iosapic_rte_info,
594                                  rte_list);
595                 list_del(&rte->rte_list);
596                 preallocated++;
597         } else {
598                 rte = kmalloc(sizeof(struct iosapic_rte_info), GFP_ATOMIC);
599                 if (!rte)
600                         return NULL;
601         }
602
603         memset(rte, 0, sizeof(struct iosapic_rte_info));
604         if (preallocated)
605                 rte->flags |= RTE_PREALLOCATED;
606
607         return rte;
608 }
609
610 static void iosapic_free_rte (struct iosapic_rte_info *rte)
611 {
612         if (rte->flags & RTE_PREALLOCATED)
613                 list_add_tail(&rte->rte_list, &free_rte_list);
614         else
615                 kfree(rte);
616 }
617
618 static inline int vector_is_shared (int vector)
619 {
620         return (iosapic_intr_info[vector].count > 1);
621 }
622
623 static int
624 register_intr (unsigned int gsi, int vector, unsigned char delivery,
625                unsigned long polarity, unsigned long trigger)
626 {
627         irq_desc_t *idesc;
628         struct hw_interrupt_type *irq_type;
629         int rte_index;
630         int index;
631         unsigned long gsi_base;
632         void __iomem *iosapic_address;
633         struct iosapic_rte_info *rte;
634
635         index = find_iosapic(gsi);
636         if (index < 0) {
637                 printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n",
638                        __FUNCTION__, gsi);
639                 return -ENODEV;
640         }
641
642         iosapic_address = iosapic_lists[index].addr;
643         gsi_base = iosapic_lists[index].gsi_base;
644
645         rte = gsi_vector_to_rte(gsi, vector);
646         if (!rte) {
647                 rte = iosapic_alloc_rte();
648                 if (!rte) {
649                         printk(KERN_WARNING "%s: cannot allocate memory\n",
650                                __FUNCTION__);
651                         return -ENOMEM;
652                 }
653
654                 rte_index = gsi - gsi_base;
655                 rte->rte_index  = rte_index;
656                 rte->addr       = iosapic_address;
657                 rte->gsi_base   = gsi_base;
658                 rte->refcnt++;
659                 list_add_tail(&rte->rte_list, &iosapic_intr_info[vector].rtes);
660                 iosapic_intr_info[vector].count++;
661                 iosapic_lists[index].rtes_inuse++;
662         }
663         else if (vector_is_shared(vector)) {
664                 struct iosapic_intr_info *info = &iosapic_intr_info[vector];
665                 if (info->trigger != trigger || info->polarity != polarity) {
666                         printk (KERN_WARNING
667                                 "%s: cannot override the interrupt\n",
668                                 __FUNCTION__);
669                         return -EINVAL;
670                 }
671         }
672
673         iosapic_intr_info[vector].polarity = polarity;
674         iosapic_intr_info[vector].dmode    = delivery;
675         iosapic_intr_info[vector].trigger  = trigger;
676
677         if (trigger == IOSAPIC_EDGE)
678                 irq_type = &irq_type_iosapic_edge;
679         else
680                 irq_type = &irq_type_iosapic_level;
681
682         idesc = irq_desc + vector;
683         if (idesc->chip != irq_type) {
684                 if (idesc->chip != &no_irq_type)
685                         printk(KERN_WARNING
686                                "%s: changing vector %d from %s to %s\n",
687                                __FUNCTION__, vector,
688                                idesc->chip->name, irq_type->name);
689                 idesc->chip = irq_type;
690         }
691         return 0;
692 }
693
694 static unsigned int
695 get_target_cpu (unsigned int gsi, int vector)
696 {
697 #ifdef CONFIG_SMP
698         static int cpu = -1;
699         extern int cpe_vector;
700
701         /*
702          * In case of vector shared by multiple RTEs, all RTEs that
703          * share the vector need to use the same destination CPU.
704          */
705         if (!list_empty(&iosapic_intr_info[vector].rtes))
706                 return iosapic_intr_info[vector].dest;
707
708         /*
709          * If the platform supports redirection via XTP, let it
710          * distribute interrupts.
711          */
712         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
713                 return cpu_physical_id(smp_processor_id());
714
715         /*
716          * Some interrupts (ACPI SCI, for instance) are registered
717          * before the BSP is marked as online.
718          */
719         if (!cpu_online(smp_processor_id()))
720                 return cpu_physical_id(smp_processor_id());
721
722 #ifdef CONFIG_ACPI
723         if (cpe_vector > 0 && vector == IA64_CPEP_VECTOR)
724                 return get_cpei_target_cpu();
725 #endif
726
727 #ifdef CONFIG_NUMA
728         {
729                 int num_cpus, cpu_index, iosapic_index, numa_cpu, i = 0;
730                 cpumask_t cpu_mask;
731
732                 iosapic_index = find_iosapic(gsi);
733                 if (iosapic_index < 0 ||
734                     iosapic_lists[iosapic_index].node == MAX_NUMNODES)
735                         goto skip_numa_setup;
736
737                 cpu_mask = node_to_cpumask(iosapic_lists[iosapic_index].node);
738
739                 for_each_cpu_mask(numa_cpu, cpu_mask) {
740                         if (!cpu_online(numa_cpu))
741                                 cpu_clear(numa_cpu, cpu_mask);
742                 }
743
744                 num_cpus = cpus_weight(cpu_mask);
745
746                 if (!num_cpus)
747                         goto skip_numa_setup;
748
749                 /* Use vector assignment to distribute across cpus in node */
750                 cpu_index = vector % num_cpus;
751
752                 for (numa_cpu = first_cpu(cpu_mask) ; i < cpu_index ; i++)
753                         numa_cpu = next_cpu(numa_cpu, cpu_mask);
754
755                 if (numa_cpu != NR_CPUS)
756                         return cpu_physical_id(numa_cpu);
757         }
758 skip_numa_setup:
759 #endif
760         /*
761          * Otherwise, round-robin interrupt vectors across all the
762          * processors.  (It'd be nice if we could be smarter in the
763          * case of NUMA.)
764          */
765         do {
766                 if (++cpu >= NR_CPUS)
767                         cpu = 0;
768         } while (!cpu_online(cpu));
769
770         return cpu_physical_id(cpu);
771 #else  /* CONFIG_SMP */
772         return cpu_physical_id(smp_processor_id());
773 #endif
774 }
775
776 /*
777  * ACPI can describe IOSAPIC interrupts via static tables and namespace
778  * methods.  This provides an interface to register those interrupts and
779  * program the IOSAPIC RTE.
780  */
781 int
782 iosapic_register_intr (unsigned int gsi,
783                        unsigned long polarity, unsigned long trigger)
784 {
785         int vector, mask = 1, err;
786         unsigned int dest;
787         unsigned long flags;
788         struct iosapic_rte_info *rte;
789         u32 low32;
790 again:
791         /*
792          * If this GSI has already been registered (i.e., it's a
793          * shared interrupt, or we lost a race to register it),
794          * don't touch the RTE.
795          */
796         spin_lock_irqsave(&iosapic_lock, flags);
797         {
798                 vector = gsi_to_vector(gsi);
799                 if (vector > 0) {
800                         rte = gsi_vector_to_rte(gsi, vector);
801                         rte->refcnt++;
802                         spin_unlock_irqrestore(&iosapic_lock, flags);
803                         return vector;
804                 }
805         }
806         spin_unlock_irqrestore(&iosapic_lock, flags);
807
808         /* If vector is running out, we try to find a sharable vector */
809         vector = assign_irq_vector(AUTO_ASSIGN);
810         if (vector < 0) {
811                 vector = iosapic_find_sharable_vector(trigger, polarity);
812                 if (vector < 0)
813                         return -ENOSPC;
814         }
815
816         spin_lock_irqsave(&irq_desc[vector].lock, flags);
817         spin_lock(&iosapic_lock);
818         {
819                 if (gsi_to_vector(gsi) > 0) {
820                         if (list_empty(&iosapic_intr_info[vector].rtes))
821                                 free_irq_vector(vector);
822                         spin_unlock(&iosapic_lock);
823                         spin_unlock_irqrestore(&irq_desc[vector].lock,
824                                                flags);
825                         goto again;
826                 }
827
828                 dest = get_target_cpu(gsi, vector);
829                 err = register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY,
830                               polarity, trigger);
831                 if (err < 0) {
832                         spin_unlock(&iosapic_lock);
833                         spin_unlock_irqrestore(&irq_desc[vector].lock,
834                                                flags);
835                         return err;
836                 }
837
838                 /*
839                  * If the vector is shared and already unmasked for
840                  * other interrupt sources, don't mask it.
841                  */
842                 low32 = iosapic_intr_info[vector].low32;
843                 if (vector_is_shared(vector) && !(low32 & IOSAPIC_MASK))
844                         mask = 0;
845                 set_rte(gsi, vector, dest, mask);
846         }
847         spin_unlock(&iosapic_lock);
848         spin_unlock_irqrestore(&irq_desc[vector].lock, flags);
849
850         printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n",
851                gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
852                (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
853                cpu_logical_id(dest), dest, vector);
854
855         return vector;
856 }
857
858 void
859 iosapic_unregister_intr (unsigned int gsi)
860 {
861         unsigned long flags;
862         int irq, vector, index;
863         irq_desc_t *idesc;
864         u32 low32;
865         unsigned long trigger, polarity;
866         unsigned int dest;
867         struct iosapic_rte_info *rte;
868
869         /*
870          * If the irq associated with the gsi is not found,
871          * iosapic_unregister_intr() is unbalanced. We need to check
872          * this again after getting locks.
873          */
874         irq = gsi_to_irq(gsi);
875         if (irq < 0) {
876                 printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n",
877                        gsi);
878                 WARN_ON(1);
879                 return;
880         }
881         vector = irq_to_vector(irq);
882
883         idesc = irq_desc + irq;
884         spin_lock_irqsave(&idesc->lock, flags);
885         spin_lock(&iosapic_lock);
886         {
887                 if ((rte = gsi_vector_to_rte(gsi, vector)) == NULL) {
888                         printk(KERN_ERR
889                                "iosapic_unregister_intr(%u) unbalanced\n",
890                                gsi);
891                         WARN_ON(1);
892                         goto out;
893                 }
894
895                 if (--rte->refcnt > 0)
896                         goto out;
897
898                 /* Mask the interrupt */
899                 low32 = iosapic_intr_info[vector].low32 | IOSAPIC_MASK;
900                 iosapic_write(rte->addr, IOSAPIC_RTE_LOW(rte->rte_index),
901                               low32);
902
903                 /* Remove the rte entry from the list */
904                 list_del(&rte->rte_list);
905                 iosapic_intr_info[vector].count--;
906                 iosapic_free_rte(rte);
907                 index = find_iosapic(gsi);
908                 iosapic_lists[index].rtes_inuse--;
909                 WARN_ON(iosapic_lists[index].rtes_inuse < 0);
910
911                 trigger  = iosapic_intr_info[vector].trigger;
912                 polarity = iosapic_intr_info[vector].polarity;
913                 dest     = iosapic_intr_info[vector].dest;
914                 printk(KERN_INFO
915                        "GSI %u (%s, %s) -> CPU %d (0x%04x)"
916                        " vector %d unregistered\n",
917                        gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
918                        (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
919                        cpu_logical_id(dest), dest, vector);
920
921                 if (list_empty(&iosapic_intr_info[vector].rtes)) {
922                         /* Sanity check */
923                         BUG_ON(iosapic_intr_info[vector].count);
924
925                         /* Clear the interrupt controller descriptor */
926                         idesc->chip = &no_irq_type;
927
928 #ifdef CONFIG_SMP
929                         /* Clear affinity */
930                         cpus_setall(idesc->affinity);
931 #endif
932
933                         /* Clear the interrupt information */
934                         memset(&iosapic_intr_info[vector], 0,
935                                sizeof(struct iosapic_intr_info));
936                         iosapic_intr_info[vector].low32 |= IOSAPIC_MASK;
937                         INIT_LIST_HEAD(&iosapic_intr_info[vector].rtes);
938
939                         if (idesc->action) {
940                                 printk(KERN_ERR
941                                        "interrupt handlers still exist on"
942                                        "IRQ %u\n", irq);
943                                 WARN_ON(1);
944                         }
945
946                         /* Free the interrupt vector */
947                         free_irq_vector(vector);
948                 }
949         }
950  out:
951         spin_unlock(&iosapic_lock);
952         spin_unlock_irqrestore(&idesc->lock, flags);
953 }
954
955 /*
956  * ACPI calls this when it finds an entry for a platform interrupt.
957  */
958 int __init
959 iosapic_register_platform_intr (u32 int_type, unsigned int gsi,
960                                 int iosapic_vector, u16 eid, u16 id,
961                                 unsigned long polarity, unsigned long trigger)
962 {
963         static const char * const name[] = {"unknown", "PMI", "INIT", "CPEI"};
964         unsigned char delivery;
965         int vector, mask = 0;
966         unsigned int dest = ((id << 8) | eid) & 0xffff;
967
968         switch (int_type) {
969               case ACPI_INTERRUPT_PMI:
970                 vector = iosapic_vector;
971                 /*
972                  * since PMI vector is alloc'd by FW(ACPI) not by kernel,
973                  * we need to make sure the vector is available
974                  */
975                 iosapic_reassign_vector(vector);
976                 delivery = IOSAPIC_PMI;
977                 break;
978               case ACPI_INTERRUPT_INIT:
979                 vector = assign_irq_vector(AUTO_ASSIGN);
980                 if (vector < 0)
981                         panic("%s: out of interrupt vectors!\n", __FUNCTION__);
982                 delivery = IOSAPIC_INIT;
983                 break;
984               case ACPI_INTERRUPT_CPEI:
985                 vector = IA64_CPE_VECTOR;
986                 delivery = IOSAPIC_LOWEST_PRIORITY;
987                 mask = 1;
988                 break;
989               default:
990                 printk(KERN_ERR "%s: invalid int type 0x%x\n", __FUNCTION__,
991                        int_type);
992                 return -1;
993         }
994
995         register_intr(gsi, vector, delivery, polarity, trigger);
996
997         printk(KERN_INFO
998                "PLATFORM int %s (0x%x): GSI %u (%s, %s) -> CPU %d (0x%04x)"
999                " vector %d\n",
1000                int_type < ARRAY_SIZE(name) ? name[int_type] : "unknown",
1001                int_type, gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
1002                (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
1003                cpu_logical_id(dest), dest, vector);
1004
1005         set_rte(gsi, vector, dest, mask);
1006         return vector;
1007 }
1008
1009 /*
1010  * ACPI calls this when it finds an entry for a legacy ISA IRQ override.
1011  */
1012 void __init
1013 iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi,
1014                           unsigned long polarity,
1015                           unsigned long trigger)
1016 {
1017         int vector;
1018         unsigned int dest = cpu_physical_id(smp_processor_id());
1019
1020         vector = isa_irq_to_vector(isa_irq);
1021
1022         register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, polarity, trigger);
1023
1024         DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n",
1025             isa_irq, gsi, trigger == IOSAPIC_EDGE ? "edge" : "level",
1026             polarity == IOSAPIC_POL_HIGH ? "high" : "low",
1027             cpu_logical_id(dest), dest, vector);
1028
1029         set_rte(gsi, vector, dest, 1);
1030 }
1031
1032 void __init
1033 iosapic_system_init (int system_pcat_compat)
1034 {
1035         int vector;
1036
1037         for (vector = 0; vector < IA64_NUM_VECTORS; ++vector) {
1038                 iosapic_intr_info[vector].low32 = IOSAPIC_MASK;
1039                 /* mark as unused */
1040                 INIT_LIST_HEAD(&iosapic_intr_info[vector].rtes);
1041         }
1042
1043         pcat_compat = system_pcat_compat;
1044         if (pcat_compat) {
1045                 /*
1046                  * Disable the compatibility mode interrupts (8259 style),
1047                  * needs IN/OUT support enabled.
1048                  */
1049                 printk(KERN_INFO
1050                        "%s: Disabling PC-AT compatible 8259 interrupts\n",
1051                        __FUNCTION__);
1052                 outb(0xff, 0xA1);
1053                 outb(0xff, 0x21);
1054         }
1055 }
1056
1057 static inline int
1058 iosapic_alloc (void)
1059 {
1060         int index;
1061
1062         for (index = 0; index < NR_IOSAPICS; index++)
1063                 if (!iosapic_lists[index].addr)
1064                         return index;
1065
1066         printk(KERN_WARNING "%s: failed to allocate iosapic\n", __FUNCTION__);
1067         return -1;
1068 }
1069
1070 static inline void
1071 iosapic_free (int index)
1072 {
1073         memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0]));
1074 }
1075
1076 static inline int
1077 iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver)
1078 {
1079         int index;
1080         unsigned int gsi_end, base, end;
1081
1082         /* check gsi range */
1083         gsi_end = gsi_base + ((ver >> 16) & 0xff);
1084         for (index = 0; index < NR_IOSAPICS; index++) {
1085                 if (!iosapic_lists[index].addr)
1086                         continue;
1087
1088                 base = iosapic_lists[index].gsi_base;
1089                 end  = base + iosapic_lists[index].num_rte - 1;
1090
1091                 if (gsi_end < base || end < gsi_base)
1092                         continue; /* OK */
1093
1094                 return -EBUSY;
1095         }
1096         return 0;
1097 }
1098
1099 int __devinit
1100 iosapic_init (unsigned long phys_addr, unsigned int gsi_base)
1101 {
1102         int num_rte, err, index;
1103         unsigned int isa_irq, ver;
1104         char __iomem *addr;
1105         unsigned long flags;
1106
1107         spin_lock_irqsave(&iosapic_lock, flags);
1108         {
1109                 addr = ioremap(phys_addr, 0);
1110                 ver = iosapic_version(addr);
1111
1112                 if ((err = iosapic_check_gsi_range(gsi_base, ver))) {
1113                         iounmap(addr);
1114                         spin_unlock_irqrestore(&iosapic_lock, flags);
1115                         return err;
1116                 }
1117
1118                 /*
1119                  * The MAX_REDIR register holds the highest input pin
1120                  * number (starting from 0).
1121                  * We add 1 so that we can use it for number of pins (= RTEs)
1122                  */
1123                 num_rte = ((ver >> 16) & 0xff) + 1;
1124
1125                 index = iosapic_alloc();
1126                 iosapic_lists[index].addr = addr;
1127                 iosapic_lists[index].gsi_base = gsi_base;
1128                 iosapic_lists[index].num_rte = num_rte;
1129 #ifdef CONFIG_NUMA
1130                 iosapic_lists[index].node = MAX_NUMNODES;
1131 #endif
1132         }
1133         spin_unlock_irqrestore(&iosapic_lock, flags);
1134
1135         if ((gsi_base == 0) && pcat_compat) {
1136                 /*
1137                  * Map the legacy ISA devices into the IOSAPIC data.  Some of
1138                  * these may get reprogrammed later on with data from the ACPI
1139                  * Interrupt Source Override table.
1140                  */
1141                 for (isa_irq = 0; isa_irq < 16; ++isa_irq)
1142                         iosapic_override_isa_irq(isa_irq, isa_irq,
1143                                                  IOSAPIC_POL_HIGH,
1144                                                  IOSAPIC_EDGE);
1145         }
1146         return 0;
1147 }
1148
1149 #ifdef CONFIG_HOTPLUG
1150 int
1151 iosapic_remove (unsigned int gsi_base)
1152 {
1153         int index, err = 0;
1154         unsigned long flags;
1155
1156         spin_lock_irqsave(&iosapic_lock, flags);
1157         {
1158                 index = find_iosapic(gsi_base);
1159                 if (index < 0) {
1160                         printk(KERN_WARNING "%s: No IOSAPIC for GSI base %u\n",
1161                                __FUNCTION__, gsi_base);
1162                         goto out;
1163                 }
1164
1165                 if (iosapic_lists[index].rtes_inuse) {
1166                         err = -EBUSY;
1167                         printk(KERN_WARNING
1168                                "%s: IOSAPIC for GSI base %u is busy\n",
1169                                __FUNCTION__, gsi_base);
1170                         goto out;
1171                 }
1172
1173                 iounmap(iosapic_lists[index].addr);
1174                 iosapic_free(index);
1175         }
1176  out:
1177         spin_unlock_irqrestore(&iosapic_lock, flags);
1178         return err;
1179 }
1180 #endif /* CONFIG_HOTPLUG */
1181
1182 #ifdef CONFIG_NUMA
1183 void __devinit
1184 map_iosapic_to_node(unsigned int gsi_base, int node)
1185 {
1186         int index;
1187
1188         index = find_iosapic(gsi_base);
1189         if (index < 0) {
1190                 printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n",
1191                        __FUNCTION__, gsi_base);
1192                 return;
1193         }
1194         iosapic_lists[index].node = node;
1195         return;
1196 }
1197 #endif
1198
1199 static int __init iosapic_enable_kmalloc (void)
1200 {
1201         iosapic_kmalloc_ok = 1;
1202         return 0;
1203 }
1204 core_initcall (iosapic_enable_kmalloc);