1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25 /*
26 * Copyright (c) 2010, Intel Corporation.
27 * All rights reserved.
28 */
29 /*
30 * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
31 * Copyright 2013 Pluribus Networks, Inc.
32 */
33
34 #include <sys/processor.h>
35 #include <sys/time.h>
36 #include <sys/psm.h>
37 #include <sys/smp_impldefs.h>
38 #include <sys/cram.h>
39 #include <sys/acpi/acpi.h>
40 #include <sys/acpica.h>
41 #include <sys/psm_common.h>
42 #include <sys/pit.h>
43 #include <sys/ddi.h>
44 #include <sys/sunddi.h>
45 #include <sys/ddi_impldefs.h>
46 #include <sys/pci.h>
47 #include <sys/promif.h>
48 #include <sys/x86_archext.h>
49 #include <sys/cpc_impl.h>
50 #include <sys/uadmin.h>
51 #include <sys/panic.h>
52 #include <sys/debug.h>
53 #include <sys/archsystm.h>
54 #include <sys/trap.h>
55 #include <sys/machsystm.h>
56 #include <sys/sysmacros.h>
57 #include <sys/cpuvar.h>
58 #include <sys/rm_platter.h>
59 #include <sys/privregs.h>
60 #include <sys/note.h>
61 #include <sys/pci_intr_lib.h>
62 #include <sys/spl.h>
63 #include <sys/clock.h>
64 #include <sys/dditypes.h>
65 #include <sys/sunddi.h>
66 #include <sys/x_call.h>
67 #include <sys/reboot.h>
68 #include <sys/apix.h>
69
70 static int apix_get_avail_vector_oncpu(uint32_t, int, int);
71 static apix_vector_t *apix_init_vector(processorid_t, uchar_t);
72 static void apix_cleanup_vector(apix_vector_t *);
73 static void apix_insert_av(apix_vector_t *, void *, avfunc, caddr_t, caddr_t,
74 uint64_t *, int, dev_info_t *);
75 static void apix_remove_av(apix_vector_t *, struct autovec *);
76 static void apix_clear_dev_map(dev_info_t *, int, int);
77 static boolean_t apix_is_cpu_enabled(processorid_t);
78 static void apix_wait_till_seen(processorid_t, int);
79
80 #define GET_INTR_INUM(ihdlp) \
81 (((ihdlp) != NULL) ? ((ddi_intr_handle_impl_t *)(ihdlp))->ih_inum : 0)
82
83 apix_rebind_info_t apix_rebindinfo = {0, 0, 0, NULL, 0, NULL};
84
85 /*
86 * Allocate IPI
87 *
88 * Return vector number or 0 on error
89 */
90 uchar_t
91 apix_alloc_ipi(int ipl)
92 {
93 apix_vector_t *vecp;
94 uchar_t vector;
95 int cpun;
96 int nproc;
97
98 APIX_ENTER_CPU_LOCK(0);
99
100 vector = apix_get_avail_vector_oncpu(0, APIX_IPI_MIN, APIX_IPI_MAX);
101 if (vector == 0) {
102 APIX_LEAVE_CPU_LOCK(0);
103 cmn_err(CE_WARN, "apix: no available IPI\n");
104 apic_error |= APIC_ERR_GET_IPIVECT_FAIL;
105 return (0);
106 }
107
108 nproc = max(apic_nproc, apic_max_nproc);
109 for (cpun = 0; cpun < nproc; cpun++) {
110 vecp = xv_vector(cpun, vector);
111 if (vecp == NULL) {
112 vecp = kmem_zalloc(sizeof (apix_vector_t), KM_NOSLEEP);
113 if (vecp == NULL) {
114 cmn_err(CE_WARN, "apix: No memory for ipi");
115 goto fail;
116 }
117 xv_vector(cpun, vector) = vecp;
118 }
119 vecp->v_state = APIX_STATE_ALLOCED;
120 vecp->v_type = APIX_TYPE_IPI;
121 vecp->v_cpuid = vecp->v_bound_cpuid = cpun;
122 vecp->v_vector = vector;
123 vecp->v_pri = ipl;
124 }
125 APIX_LEAVE_CPU_LOCK(0);
126 return (vector);
127
128 fail:
129 while (--cpun >= 0)
130 apix_cleanup_vector(xv_vector(cpun, vector));
131 APIX_LEAVE_CPU_LOCK(0);
132 return (0);
133 }
134
135 /*
136 * Add IPI service routine
137 */
138 static int
139 apix_add_ipi(int ipl, avfunc xxintr, char *name, int vector,
140 caddr_t arg1, caddr_t arg2)
141 {
142 int cpun;
143 apix_vector_t *vecp;
144 int nproc;
145
146 ASSERT(vector >= APIX_IPI_MIN && vector <= APIX_IPI_MAX);
147
148 nproc = max(apic_nproc, apic_max_nproc);
149 for (cpun = 0; cpun < nproc; cpun++) {
150 APIX_ENTER_CPU_LOCK(cpun);
151 vecp = xv_vector(cpun, vector);
152 apix_insert_av(vecp, NULL, xxintr, arg1, arg2, NULL, ipl, NULL);
153 vecp->v_state = APIX_STATE_ENABLED;
154 APIX_LEAVE_CPU_LOCK(cpun);
155 }
156
157 APIC_VERBOSE(IPI, (CE_CONT, "apix: add ipi for %s, vector %x "
158 "ipl %x\n", name, vector, ipl));
159
160 return (1);
161 }
162
163 /*
164 * Find and return first free vector in range (start, end)
165 */
166 static int
167 apix_get_avail_vector_oncpu(uint32_t cpuid, int start, int end)
168 {
169 int i;
170 apix_impl_t *apixp = apixs[cpuid];
171
172 for (i = start; i <= end; i++) {
173 if (APIC_CHECK_RESERVE_VECTORS(i))
174 continue;
175 if (IS_VECT_FREE(apixp->x_vectbl[i]))
176 return (i);
177 }
178
179 return (0);
180 }
181
182 /*
183 * Allocate a vector on specified cpu
184 *
185 * Return NULL on error
186 */
187 static apix_vector_t *
188 apix_alloc_vector_oncpu(uint32_t cpuid, dev_info_t *dip, int inum, int type)
189 {
190 processorid_t tocpu = cpuid & ~IRQ_USER_BOUND;
191 apix_vector_t *vecp;
192 int vector;
193
194 ASSERT(APIX_CPU_LOCK_HELD(tocpu));
195
196 /* find free vector */
197 vector = apix_get_avail_vector_oncpu(tocpu, APIX_AVINTR_MIN,
198 APIX_AVINTR_MAX);
199 if (vector == 0)
200 return (NULL);
201
202 vecp = apix_init_vector(tocpu, vector);
203 vecp->v_type = (ushort_t)type;
204 vecp->v_inum = inum;
205 vecp->v_flags = (cpuid & IRQ_USER_BOUND) ? APIX_VECT_USER_BOUND : 0;
206
207 if (dip != NULL)
208 apix_set_dev_map(vecp, dip, inum);
209
210 return (vecp);
211 }
212
213 /*
214 * Allocates "count" contiguous MSI vectors starting at the proper alignment.
215 * Caller needs to make sure that count has to be power of 2 and should not
216 * be < 1.
217 *
218 * Return first vector number
219 */
220 apix_vector_t *
221 apix_alloc_nvectors_oncpu(uint32_t cpuid, dev_info_t *dip, int inum,
222 int count, int type)
223 {
224 int i, msibits, start = 0, navail = 0;
225 apix_vector_t *vecp, *startp = NULL;
226 processorid_t tocpu = cpuid & ~IRQ_USER_BOUND;
227 uint_t flags;
228
229 ASSERT(APIX_CPU_LOCK_HELD(tocpu));
230
231 /*
232 * msibits is the no. of lower order message data bits for the
233 * allocated MSI vectors and is used to calculate the aligned
234 * starting vector
235 */
236 msibits = count - 1;
237
238 /* It has to be contiguous */
239 for (i = APIX_AVINTR_MIN; i <= APIX_AVINTR_MAX; i++) {
240 if (!IS_VECT_FREE(xv_vector(tocpu, i)))
241 continue;
242
243 /*
244 * starting vector has to be aligned accordingly for
245 * multiple MSIs
246 */
247 if (msibits)
248 i = (i + msibits) & ~msibits;
249
250 for (navail = 0, start = i; i <= APIX_AVINTR_MAX; i++) {
251 if (!IS_VECT_FREE(xv_vector(tocpu, i)))
252 break;
253 if (APIC_CHECK_RESERVE_VECTORS(i))
254 break;
255 if (++navail == count)
256 goto done;
257 }
258 }
259
260 return (NULL);
261
262 done:
263 flags = (cpuid & IRQ_USER_BOUND) ? APIX_VECT_USER_BOUND : 0;
264
265 for (i = 0; i < count; i++) {
266 if ((vecp = apix_init_vector(tocpu, start + i)) == NULL)
267 goto fail;
268
269 vecp->v_type = (ushort_t)type;
270 vecp->v_inum = inum + i;
271 vecp->v_flags = flags;
272
273 if (dip != NULL)
274 apix_set_dev_map(vecp, dip, inum + i);
275
276 if (i == 0)
277 startp = vecp;
278 }
279
280 return (startp);
281
282 fail:
283 while (i-- > 0) { /* Free allocated vectors */
284 vecp = xv_vector(tocpu, start + i);
285 apix_clear_dev_map(dip, inum + i, type);
286 apix_cleanup_vector(vecp);
287 }
288 return (NULL);
289 }
290
291 #define APIX_WRITE_MSI_DATA(_hdl, _cap, _ctrl, _v)\
292 do {\
293 if ((_ctrl) & PCI_MSI_64BIT_MASK)\
294 pci_config_put16((_hdl), (_cap) + PCI_MSI_64BIT_DATA, (_v));\
295 else\
296 pci_config_put16((_hdl), (_cap) + PCI_MSI_32BIT_DATA, (_v));\
297 _NOTE(CONSTCOND)} while (0)
298
299 static void
300 apix_pci_msi_enable_vector(apix_vector_t *vecp, dev_info_t *dip, int type,
301 int inum, int count, uchar_t vector, int target_apic_id)
302 {
303 uint64_t msi_addr, msi_data;
304 ushort_t msi_ctrl;
305 int i, cap_ptr = i_ddi_get_msi_msix_cap_ptr(dip);
306 ddi_acc_handle_t handle = i_ddi_get_pci_config_handle(dip);
307 msi_regs_t msi_regs;
308 void *intrmap_tbl[PCI_MSI_MAX_INTRS];
309
310 DDI_INTR_IMPLDBG((CE_CONT, "apix_pci_msi_enable_vector: dip=0x%p\n"
311 "\tdriver = %s, inum=0x%x vector=0x%x apicid=0x%x\n", (void *)dip,
312 ddi_driver_name(dip), inum, vector, target_apic_id));
313
314 ASSERT((handle != NULL) && (cap_ptr != 0));
315
316 msi_regs.mr_data = vector;
317 msi_regs.mr_addr = target_apic_id;
318
319 for (i = 0; i < count; i++)
320 intrmap_tbl[i] = xv_intrmap_private(vecp->v_cpuid, vector + i);
321 apic_vt_ops->apic_intrmap_alloc_entry(intrmap_tbl, dip, type,
322 count, 0xff);
323 for (i = 0; i < count; i++)
324 xv_intrmap_private(vecp->v_cpuid, vector + i) = intrmap_tbl[i];
325
326 apic_vt_ops->apic_intrmap_map_entry(vecp->v_intrmap_private,
327 (void *)&msi_regs, type, count);
328 apic_vt_ops->apic_intrmap_record_msi(vecp->v_intrmap_private,
329 &msi_regs);
330
331 /* MSI Address */
332 msi_addr = msi_regs.mr_addr;
333
334 /* MSI Data: MSI is edge triggered according to spec */
335 msi_data = msi_regs.mr_data;
336
337 DDI_INTR_IMPLDBG((CE_CONT, "apix_pci_msi_enable_vector: addr=0x%lx "
338 "data=0x%lx\n", (long)msi_addr, (long)msi_data));
339
340 if (type == APIX_TYPE_MSI) {
341 msi_ctrl = pci_config_get16(handle, cap_ptr + PCI_MSI_CTRL);
342
343 /* Set the bits to inform how many MSIs are enabled */
344 msi_ctrl |= ((highbit(count) - 1) << PCI_MSI_MME_SHIFT);
345 pci_config_put16(handle, cap_ptr + PCI_MSI_CTRL, msi_ctrl);
346
347 if ((vecp->v_flags & APIX_VECT_MASKABLE) == 0)
348 APIX_WRITE_MSI_DATA(handle, cap_ptr, msi_ctrl,
349 APIX_RESV_VECTOR);
350
351 pci_config_put32(handle,
352 cap_ptr + PCI_MSI_ADDR_OFFSET, msi_addr);
353 if (msi_ctrl & PCI_MSI_64BIT_MASK)
354 pci_config_put32(handle,
355 cap_ptr + PCI_MSI_ADDR_OFFSET + 4, msi_addr >> 32);
356
357 APIX_WRITE_MSI_DATA(handle, cap_ptr, msi_ctrl, msi_data);
358 } else if (type == APIX_TYPE_MSIX) {
359 uintptr_t off;
360 ddi_intr_msix_t *msix_p = i_ddi_get_msix(dip);
361
362 /* Offset into the "inum"th entry in the MSI-X table */
363 off = (uintptr_t)msix_p->msix_tbl_addr +
364 (inum * PCI_MSIX_VECTOR_SIZE);
365
366 ddi_put32(msix_p->msix_tbl_hdl,
367 (uint32_t *)(off + PCI_MSIX_DATA_OFFSET), msi_data);
368 ddi_put32(msix_p->msix_tbl_hdl,
369 (uint32_t *)(off + PCI_MSIX_LOWER_ADDR_OFFSET), msi_addr);
370 ddi_put32(msix_p->msix_tbl_hdl,
371 (uint32_t *)(off + PCI_MSIX_UPPER_ADDR_OFFSET),
372 msi_addr >> 32);
373 }
374 }
375
376 static void
377 apix_pci_msi_enable_mode(dev_info_t *dip, int type, int inum)
378 {
379 ushort_t msi_ctrl;
380 int cap_ptr = i_ddi_get_msi_msix_cap_ptr(dip);
381 ddi_acc_handle_t handle = i_ddi_get_pci_config_handle(dip);
382
383 ASSERT((handle != NULL) && (cap_ptr != 0));
384
385 if (type == APIX_TYPE_MSI) {
386 msi_ctrl = pci_config_get16(handle, cap_ptr + PCI_MSI_CTRL);
387 if ((msi_ctrl & PCI_MSI_ENABLE_BIT))
388 return;
389
390 msi_ctrl |= PCI_MSI_ENABLE_BIT;
391 pci_config_put16(handle, cap_ptr + PCI_MSI_CTRL, msi_ctrl);
392
393 } else if (type == DDI_INTR_TYPE_MSIX) {
394 uintptr_t off;
395 uint32_t mask;
396 ddi_intr_msix_t *msix_p;
397
398 msix_p = i_ddi_get_msix(dip);
399
400 /* Offset into "inum"th entry in the MSI-X table & clear mask */
401 off = (uintptr_t)msix_p->msix_tbl_addr + (inum *
402 PCI_MSIX_VECTOR_SIZE) + PCI_MSIX_VECTOR_CTRL_OFFSET;
403
404 mask = ddi_get32(msix_p->msix_tbl_hdl, (uint32_t *)off);
405
406 ddi_put32(msix_p->msix_tbl_hdl, (uint32_t *)off, (mask & ~1));
407
408 msi_ctrl = pci_config_get16(handle, cap_ptr + PCI_MSIX_CTRL);
409
410 if (!(msi_ctrl & PCI_MSIX_ENABLE_BIT)) {
411 msi_ctrl |= PCI_MSIX_ENABLE_BIT;
412 pci_config_put16(handle, cap_ptr + PCI_MSIX_CTRL,
413 msi_ctrl);
414 }
415 }
416 }
417
418 /*
419 * Setup interrupt, pogramming IO-APIC or MSI/X address/data.
420 */
421 void
422 apix_enable_vector(apix_vector_t *vecp)
423 {
424 int tocpu = vecp->v_cpuid, type = vecp->v_type;
425 apic_cpus_info_t *cpu_infop;
426 ulong_t iflag;
427
428 ASSERT(tocpu < apic_nproc);
429
430 cpu_infop = &apic_cpus[tocpu];
431 if (vecp->v_flags & APIX_VECT_USER_BOUND)
432 cpu_infop->aci_bound++;
433 else
434 cpu_infop->aci_temp_bound++;
435
436 iflag = intr_clear();
437 lock_set(&apic_ioapic_lock);
438
439 if (!DDI_INTR_IS_MSI_OR_MSIX(type)) { /* fixed */
440 apix_intx_enable(vecp->v_inum);
441 } else {
442 int inum = vecp->v_inum;
443 dev_info_t *dip = APIX_GET_DIP(vecp);
444 int count = i_ddi_intr_get_current_nintrs(dip);
445
446 if (type == APIX_TYPE_MSI) { /* MSI */
447 if (inum == apix_get_max_dev_inum(dip, type)) {
448 /* last one */
449 uchar_t start_inum = inum + 1 - count;
450 uchar_t start_vect = vecp->v_vector + 1 - count;
451 apix_vector_t *start_vecp =
452 xv_vector(vecp->v_cpuid, start_vect);
453
454 APIC_VERBOSE(INTR, (CE_CONT, "apix: call "
455 "apix_pci_msi_enable_vector\n"));
456 apix_pci_msi_enable_vector(start_vecp, dip,
457 type, start_inum, count, start_vect,
458 cpu_infop->aci_local_id);
459
460 APIC_VERBOSE(INTR, (CE_CONT, "apix: call "
461 "apix_pci_msi_enable_mode\n"));
462 apix_pci_msi_enable_mode(dip, type, inum);
463 }
464 } else { /* MSI-X */
465 apix_pci_msi_enable_vector(vecp, dip,
466 type, inum, 1, vecp->v_vector,
467 cpu_infop->aci_local_id);
468 apix_pci_msi_enable_mode(dip, type, inum);
469 }
470 }
471 vecp->v_state = APIX_STATE_ENABLED;
472 apic_redist_cpu_skip &= ~(1 << tocpu);
473
474 lock_clear(&apic_ioapic_lock);
475 intr_restore(iflag);
476 }
477
478 /*
479 * Disable the interrupt
480 */
481 void
482 apix_disable_vector(apix_vector_t *vecp)
483 {
484 struct autovec *avp = vecp->v_autovect;
485 ulong_t iflag;
486
487 ASSERT(avp != NULL);
488
489 iflag = intr_clear();
490 lock_set(&apic_ioapic_lock);
491
492 switch (vecp->v_type) {
493 case APIX_TYPE_MSI:
494 ASSERT(avp->av_vector != NULL && avp->av_dip != NULL);
495 /*
496 * Disable the MSI vector
497 * Make sure we only disable on the last
498 * of the multi-MSI support
499 */
500 if (i_ddi_intr_get_current_nenables(avp->av_dip) == 1) {
501 apic_pci_msi_disable_mode(avp->av_dip,
502 DDI_INTR_TYPE_MSI);
503 }
504 break;
505 case APIX_TYPE_MSIX:
506 ASSERT(avp->av_vector != NULL && avp->av_dip != NULL);
507 /*
508 * Disable the MSI-X vector
509 * needs to clear its mask and addr/data for each MSI-X
510 */
511 apic_pci_msi_unconfigure(avp->av_dip, DDI_INTR_TYPE_MSIX,
512 vecp->v_inum);
513 /*
514 * Make sure we only disable on the last MSI-X
515 */
516 if (i_ddi_intr_get_current_nenables(avp->av_dip) == 1) {
517 apic_pci_msi_disable_mode(avp->av_dip,
518 DDI_INTR_TYPE_MSIX);
519 }
520 break;
521 default:
522 apix_intx_disable(vecp->v_inum);
523 break;
524 }
525
526 if (!(apic_cpus[vecp->v_cpuid].aci_status & APIC_CPU_SUSPEND))
527 vecp->v_state = APIX_STATE_DISABLED;
528 apic_vt_ops->apic_intrmap_free_entry(&vecp->v_intrmap_private);
529 vecp->v_intrmap_private = NULL;
530
531 lock_clear(&apic_ioapic_lock);
532 intr_restore(iflag);
533 }
534
535 /*
536 * Mark vector as obsoleted or freed. The vector is marked
537 * obsoleted if there are pending requests on it. Otherwise,
538 * free the vector. The obsoleted vectors get freed after
539 * being serviced.
540 *
541 * Return 1 on being obosoleted and 0 on being freed.
542 */
543 #define INTR_BUSY(_avp)\
544 ((((volatile ushort_t)(_avp)->av_flags) &\
545 (AV_PENTRY_PEND | AV_PENTRY_ONPROC)) != 0)
546 #define LOCAL_WITH_INTR_DISABLED(_cpuid)\
547 ((_cpuid) == psm_get_cpu_id() && !interrupts_enabled())
548 static uint64_t dummy_tick;
549
550 int
551 apix_obsolete_vector(apix_vector_t *vecp)
552 {
553 struct autovec *avp = vecp->v_autovect;
554 int repeats, tries, ipl, busy = 0, cpuid = vecp->v_cpuid;
555 apix_impl_t *apixp = apixs[cpuid];
556
557 ASSERT(APIX_CPU_LOCK_HELD(cpuid));
558
559 for (avp = vecp->v_autovect; avp != NULL; avp = avp->av_link) {
560 if (avp->av_vector == NULL)
561 continue;
562
563 if (LOCAL_WITH_INTR_DISABLED(cpuid)) {
564 int bit, index, irr;
565
566 if (INTR_BUSY(avp)) {
567 busy++;
568 continue;
569 }
570
571 /* check IRR for pending interrupts */
572 index = vecp->v_vector / 32;
573 bit = vecp->v_vector % 32;
574 irr = apic_reg_ops->apic_read(APIC_IRR_REG + index);
575 if ((irr & (1 << bit)) != 0)
576 busy++;
577
578 if (!busy)
579 apix_remove_av(vecp, avp);
580
581 continue;
582 }
583
584 repeats = 0;
585 do {
586 repeats++;
587 for (tries = 0; tries < apic_max_reps_clear_pending;
588 tries++)
589 if (!INTR_BUSY(avp))
590 break;
591 } while (INTR_BUSY(avp) &&
592 (repeats < apic_max_reps_clear_pending));
593
594 if (INTR_BUSY(avp))
595 busy++;
596 else {
597 /*
598 * Interrupt is not in pending list or being serviced.
599 * However it might be cached in Local APIC's IRR
600 * register. It's impossible to check another CPU's
601 * IRR register. Then wait till lower levels finish
602 * running.
603 */
604 for (ipl = 1; ipl < MIN(LOCK_LEVEL, vecp->v_pri); ipl++)
605 apix_wait_till_seen(cpuid, ipl);
606 if (INTR_BUSY(avp))
607 busy++;
608 }
609
610 if (!busy)
611 apix_remove_av(vecp, avp);
612 }
613
614 if (busy) {
615 apix_vector_t *tp = apixp->x_obsoletes;
616
617 if (vecp->v_state == APIX_STATE_OBSOLETED)
618 return (1);
619
620 vecp->v_state = APIX_STATE_OBSOLETED;
621 vecp->v_next = NULL;
622 if (tp == NULL)
623 apixp->x_obsoletes = vecp;
624 else {
625 while (tp->v_next != NULL)
626 tp = tp->v_next;
627 tp->v_next = vecp;
628 }
629 return (1);
630 }
631
632 /* interrupt is not busy */
633 if (vecp->v_state == APIX_STATE_OBSOLETED) {
634 /* remove from obsoleted list */
635 apixp->x_obsoletes = vecp->v_next;
636 vecp->v_next = NULL;
637 }
638 apix_cleanup_vector(vecp);
639 return (0);
640 }
641
642 /*
643 * Duplicate number of continuous vectors to specified target vectors.
644 */
645 static void
646 apix_dup_vectors(apix_vector_t *oldp, apix_vector_t *newp, int count)
647 {
648 struct autovec *avp;
649 apix_vector_t *fromp, *top;
650 processorid_t oldcpu = oldp->v_cpuid, newcpu = newp->v_cpuid;
651 uchar_t oldvec = oldp->v_vector, newvec = newp->v_vector;
652 int i, inum;
653
654 ASSERT(oldp->v_type != APIX_TYPE_IPI);
655
656 for (i = 0; i < count; i++) {
657 fromp = xv_vector(oldcpu, oldvec + i);
658 top = xv_vector(newcpu, newvec + i);
659 ASSERT(fromp != NULL && top != NULL);
660
661 /* copy over original one */
662 top->v_state = fromp->v_state;
663 top->v_type = fromp->v_type;
664 top->v_bound_cpuid = fromp->v_bound_cpuid;
665 top->v_inum = fromp->v_inum;
666 top->v_flags = fromp->v_flags;
667 top->v_intrmap_private = fromp->v_intrmap_private;
668
669 for (avp = fromp->v_autovect; avp != NULL; avp = avp->av_link) {
670 if (avp->av_vector == NULL)
671 continue;
672
673 apix_insert_av(top, avp->av_intr_id, avp->av_vector,
674 avp->av_intarg1, avp->av_intarg2, avp->av_ticksp,
675 avp->av_prilevel, avp->av_dip);
676
677 if (fromp->v_type == APIX_TYPE_FIXED &&
678 avp->av_dip != NULL) {
679 inum = GET_INTR_INUM(avp->av_intr_id);
680 apix_set_dev_map(top, avp->av_dip, inum);
681 }
682 }
683
684 if (DDI_INTR_IS_MSI_OR_MSIX(fromp->v_type) &&
685 fromp->v_devp != NULL)
686 apix_set_dev_map(top, fromp->v_devp->dv_dip,
687 fromp->v_devp->dv_inum);
688 }
689 }
690
691 static apix_vector_t *
692 apix_init_vector(processorid_t cpuid, uchar_t vector)
693 {
694 apix_impl_t *apixp = apixs[cpuid];
695 apix_vector_t *vecp = apixp->x_vectbl[vector];
696
697 ASSERT(IS_VECT_FREE(vecp));
698
699 if (vecp == NULL) {
700 vecp = kmem_zalloc(sizeof (apix_vector_t), KM_NOSLEEP);
701 if (vecp == NULL) {
702 cmn_err(CE_WARN, "apix: no memory to allocate vector");
703 return (NULL);
704 }
705 apixp->x_vectbl[vector] = vecp;
706 }
707 vecp->v_state = APIX_STATE_ALLOCED;
708 vecp->v_cpuid = vecp->v_bound_cpuid = cpuid;
709 vecp->v_vector = vector;
710
711 return (vecp);
712 }
713
714 static void
715 apix_cleanup_vector(apix_vector_t *vecp)
716 {
717 ASSERT(vecp->v_share == 0);
718 vecp->v_bound_cpuid = IRQ_UNINIT;
719 vecp->v_state = APIX_STATE_FREED;
720 vecp->v_type = 0;
721 vecp->v_flags = 0;
722 vecp->v_busy = 0;
723 vecp->v_intrmap_private = NULL;
724 }
725
726 static void
727 apix_dprint_vector(apix_vector_t *vecp, dev_info_t *dip, int count)
728 {
729 #ifdef DEBUG
730 major_t major;
731 char *name, *drv_name;
732 int instance, len, t_len;
733 char mesg[1024] = "apix: ";
734
735 t_len = sizeof (mesg);
736 len = strlen(mesg);
737 if (dip != NULL) {
738 name = ddi_get_name(dip);
739 major = ddi_name_to_major(name);
740 drv_name = ddi_major_to_name(major);
741 instance = ddi_get_instance(dip);
742 (void) snprintf(mesg + len, t_len - len, "%s (%s) instance %d ",
743 name, drv_name, instance);
744 }
745 len = strlen(mesg);
746
747 switch (vecp->v_type) {
748 case APIX_TYPE_FIXED:
749 (void) snprintf(mesg + len, t_len - len, "irqno %d",
750 vecp->v_inum);
751 break;
752 case APIX_TYPE_MSI:
753 (void) snprintf(mesg + len, t_len - len,
754 "msi inum %d (count %d)", vecp->v_inum, count);
755 break;
756 case APIX_TYPE_MSIX:
757 (void) snprintf(mesg + len, t_len - len, "msi-x inum %d",
758 vecp->v_inum);
759 break;
760 default:
761 break;
762
763 }
764
765 APIC_VERBOSE(ALLOC, (CE_CONT, "%s allocated with vector 0x%x on "
766 "cpu %d\n", mesg, vecp->v_vector, vecp->v_cpuid));
767 #endif /* DEBUG */
768 }
769
770 /*
771 * Operations on avintr
772 */
773
774 #define INIT_AUTOVEC(p, intr_id, f, arg1, arg2, ticksp, ipl, dip) \
775 do { \
776 (p)->av_intr_id = intr_id; \
777 (p)->av_vector = f; \
778 (p)->av_intarg1 = arg1; \
779 (p)->av_intarg2 = arg2; \
780 (p)->av_ticksp = ticksp; \
781 (p)->av_prilevel = ipl; \
782 (p)->av_dip = dip; \
783 (p)->av_flags = 0; \
784 _NOTE(CONSTCOND)} while (0)
785
786 /*
787 * Insert an interrupt service routine into chain by its priority from
788 * high to low
789 */
790 static void
791 apix_insert_av(apix_vector_t *vecp, void *intr_id, avfunc f, caddr_t arg1,
792 caddr_t arg2, uint64_t *ticksp, int ipl, dev_info_t *dip)
793 {
794 struct autovec *p, *prep, *mem;
795
796 APIC_VERBOSE(INTR, (CE_CONT, "apix_insert_av: dip %p, vector 0x%x, "
797 "cpu %d\n", (void *)dip, vecp->v_vector, vecp->v_cpuid));
798
799 mem = kmem_zalloc(sizeof (struct autovec), KM_SLEEP);
800 INIT_AUTOVEC(mem, intr_id, f, arg1, arg2, ticksp, ipl, dip);
801 if (vecp->v_type == APIX_TYPE_FIXED && apic_level_intr[vecp->v_inum])
802 mem->av_flags |= AV_PENTRY_LEVEL;
803
804 vecp->v_share++;
805 vecp->v_pri = (ipl > vecp->v_pri) ? ipl : vecp->v_pri;
806 if (vecp->v_autovect == NULL) { /* Nothing on list - put it at head */
807 vecp->v_autovect = mem;
808 return;
809 }
810
811 if (DDI_INTR_IS_MSI_OR_MSIX(vecp->v_type)) { /* MSI/X */
812 ASSERT(vecp->v_share == 1); /* No sharing for MSI/X */
813
814 INIT_AUTOVEC(vecp->v_autovect, intr_id, f, arg1, arg2, ticksp,
815 ipl, dip);
816 prep = vecp->v_autovect->av_link;
817 vecp->v_autovect->av_link = NULL;
818
819 /* Free the following autovect chain */
820 while (prep != NULL) {
821 ASSERT(prep->av_vector == NULL);
822
823 p = prep;
824 prep = prep->av_link;
825 kmem_free(p, sizeof (struct autovec));
826 }
827
828 kmem_free(mem, sizeof (struct autovec));
829 return;
830 }
831
832 /* find where it goes in list */
833 prep = NULL;
834 for (p = vecp->v_autovect; p != NULL; p = p->av_link) {
835 if (p->av_vector && p->av_prilevel <= ipl)
836 break;
837 prep = p;
838 }
839 if (prep != NULL) {
840 if (prep->av_vector == NULL) { /* freed struct available */
841 INIT_AUTOVEC(prep, intr_id, f, arg1, arg2,
842 ticksp, ipl, dip);
843 prep->av_flags = mem->av_flags;
844 kmem_free(mem, sizeof (struct autovec));
845 return;
846 }
847
848 mem->av_link = prep->av_link;
849 prep->av_link = mem;
850 } else {
851 /* insert new intpt at beginning of chain */
852 mem->av_link = vecp->v_autovect;
853 vecp->v_autovect = mem;
854 }
855 }
856
857 /*
858 * After having made a change to an autovector list, wait until we have
859 * seen specified cpu not executing an interrupt at that level--so we
860 * know our change has taken effect completely (no old state in registers,
861 * etc).
862 */
863 #define APIX_CPU_ENABLED(_cp) \
864 (quiesce_active == 0 && \
865 (((_cp)->cpu_flags & (CPU_QUIESCED|CPU_OFFLINE)) == 0))
866
867 static void
868 apix_wait_till_seen(processorid_t cpuid, int ipl)
869 {
870 struct cpu *cp = cpu[cpuid];
871
872 if (cp == NULL || LOCAL_WITH_INTR_DISABLED(cpuid))
873 return;
874
875 /*
876 * Don't wait if the CPU is quiesced or offlined. This can happen
877 * when a CPU is running pause thread but hardware triggered an
878 * interrupt and the interrupt gets queued.
879 */
880 for (;;) {
881 if (!INTR_ACTIVE((volatile struct cpu *)cpu[cpuid], ipl) &&
882 (!APIX_CPU_ENABLED(cp) ||
883 !INTR_PENDING((volatile apix_impl_t *)apixs[cpuid], ipl)))
884 return;
885 }
886 }
887
888 static void
889 apix_remove_av(apix_vector_t *vecp, struct autovec *target)
890 {
891 int hi_pri = 0;
892 struct autovec *p;
893
894 if (target == NULL)
895 return;
896
897 APIC_VERBOSE(INTR, (CE_CONT, "apix_remove_av: dip %p, vector 0x%x, "
898 "cpu %d\n", (void *)target->av_dip, vecp->v_vector, vecp->v_cpuid));
899
900 for (p = vecp->v_autovect; p; p = p->av_link) {
901 if (p == target || p->av_vector == NULL)
902 continue;
903 hi_pri = (p->av_prilevel > hi_pri) ? p->av_prilevel : hi_pri;
904 }
905
906 vecp->v_share--;
907 vecp->v_pri = hi_pri;
908
909 /*
910 * This drops the handler from the chain, it can no longer be called.
911 * However, there is no guarantee that the handler is not currently
912 * still executing.
913 */
914 target->av_vector = NULL;
915 /*
916 * There is a race where we could be just about to pick up the ticksp
917 * pointer to increment it after returning from the service routine
918 * in av_dispatch_autovect. Rather than NULL it out let's just point
919 * it off to something safe so that any final tick update attempt
920 * won't fault.
921 */
922 target->av_ticksp = &dummy_tick;
923 apix_wait_till_seen(vecp->v_cpuid, target->av_prilevel);
924 }
925
926 static struct autovec *
927 apix_find_av(apix_vector_t *vecp, void *intr_id, avfunc f)
928 {
929 struct autovec *p;
930
931 for (p = vecp->v_autovect; p; p = p->av_link) {
932 if ((p->av_vector == f) && (p->av_intr_id == intr_id)) {
933 /* found the handler */
934 return (p);
935 }
936 }
937
938 return (NULL);
939 }
940
941 static apix_vector_t *
942 apix_find_vector_by_avintr(void *intr_id, avfunc f)
943 {
944 apix_vector_t *vecp;
945 processorid_t n;
946 uchar_t v;
947
948 for (n = 0; n < apic_nproc; n++) {
949 if (!apix_is_cpu_enabled(n))
950 continue;
951
952 for (v = APIX_AVINTR_MIN; v <= APIX_AVINTR_MIN; v++) {
953 vecp = xv_vector(n, v);
954 if (vecp == NULL ||
955 vecp->v_state <= APIX_STATE_OBSOLETED)
956 continue;
957
958 if (apix_find_av(vecp, intr_id, f) != NULL)
959 return (vecp);
960 }
961 }
962
963 return (NULL);
964 }
965
966 /*
967 * Add interrupt service routine.
968 *
969 * For legacy interrupts (HPET timer, ACPI SCI), the vector is actually
970 * IRQ no. A vector is then allocated. Otherwise, the vector is already
971 * allocated. The input argument virt_vect is virtual vector of format
972 * APIX_VIRTVEC_VECTOR(cpuid, vector).
973 *
974 * Return 1 on success, 0 on failure.
975 */
976 int
977 apix_add_avintr(void *intr_id, int ipl, avfunc xxintr, char *name,
978 int virt_vect, caddr_t arg1, caddr_t arg2, uint64_t *ticksp,
979 dev_info_t *dip)
980 {
981 int cpuid;
982 uchar_t v = (uchar_t)APIX_VIRTVEC_VECTOR(virt_vect);
983 apix_vector_t *vecp;
984
985 if (xxintr == NULL) {
986 cmn_err(CE_WARN, "Attempt to add null for %s "
987 "on vector 0x%x,0x%x", name,
988 APIX_VIRTVEC_CPU(virt_vect),
989 APIX_VIRTVEC_VECTOR(virt_vect));
990 return (0);
991 }
992
993 if (v >= APIX_IPI_MIN) /* IPIs */
994 return (apix_add_ipi(ipl, xxintr, name, v, arg1, arg2));
995
996 if (!APIX_IS_VIRTVEC(virt_vect)) { /* got irq */
997 int irqno = virt_vect;
998 int inum = GET_INTR_INUM(intr_id);
999
1000 /*
1001 * Senarios include:
1002 * a. add_avintr() is called before irqp initialized (legacy)
1003 * b. irqp is initialized, vector is not allocated (fixed)
1004 * c. irqp is initialized, vector is allocated (fixed & shared)
1005 */
1006 if ((vecp = apix_alloc_intx(dip, inum, irqno)) == NULL)
1007 return (0);
1008
1009 cpuid = vecp->v_cpuid;
1010 v = vecp->v_vector;
1011 virt_vect = APIX_VIRTVECTOR(cpuid, v);
1012 } else { /* got virtual vector */
1013 cpuid = APIX_VIRTVEC_CPU(virt_vect);
1014 vecp = xv_vector(cpuid, v);
1015 ASSERT(vecp != NULL);
1016 }
1017
1018 lock_set(&apix_lock);
1019 if (vecp->v_state <= APIX_STATE_OBSOLETED) {
1020 vecp = NULL;
1021
1022 /*
1023 * Basically the allocated but not enabled interrupts
1024 * will not get re-targeted. But MSIs in allocated state
1025 * could be re-targeted due to group re-targeting.
1026 */
1027 if (intr_id != NULL && dip != NULL) {
1028 ddi_intr_handle_impl_t *hdlp = intr_id;
1029 vecp = apix_get_dev_map(dip, hdlp->ih_inum,
1030 hdlp->ih_type);
1031 ASSERT(vecp->v_state == APIX_STATE_ALLOCED);
1032 }
1033 if (vecp == NULL) {
1034 lock_clear(&apix_lock);
1035 cmn_err(CE_WARN, "Invalid interrupt 0x%x,0x%x "
1036 " for %p to add", cpuid, v, intr_id);
1037 return (0);
1038 }
1039 cpuid = vecp->v_cpuid;
1040 virt_vect = APIX_VIRTVECTOR(cpuid, vecp->v_vector);
1041 }
1042
1043 APIX_ENTER_CPU_LOCK(cpuid);
1044 apix_insert_av(vecp, intr_id, xxintr, arg1, arg2, ticksp, ipl, dip);
1045 APIX_LEAVE_CPU_LOCK(cpuid);
1046
1047 (void) apix_addspl(virt_vect, ipl, 0, 0);
1048
1049 lock_clear(&apix_lock);
1050
1051 return (1);
1052 }
1053
1054 /*
1055 * Remove avintr
1056 *
1057 * For fixed, if it's the last one of shared interrupts, free the vector.
1058 * For msi/x, only disable the interrupt but not free the vector, which
1059 * is freed by PSM_XXX_FREE_XXX.
1060 */
1061 void
1062 apix_rem_avintr(void *intr_id, int ipl, avfunc xxintr, int virt_vect)
1063 {
1064 avfunc f;
1065 apix_vector_t *vecp;
1066 struct autovec *avp;
1067 processorid_t cpuid;
1068
1069 if ((f = xxintr) == NULL)
1070 return;
1071
1072 lock_set(&apix_lock);
1073
1074 if (!APIX_IS_VIRTVEC(virt_vect)) { /* got irq */
1075 vecp = apix_intx_get_vector(virt_vect);
1076 virt_vect = APIX_VIRTVECTOR(vecp->v_cpuid, vecp->v_vector);
1077 } else /* got virtual vector */
1078 vecp = xv_vector(APIX_VIRTVEC_CPU(virt_vect),
1079 APIX_VIRTVEC_VECTOR(virt_vect));
1080
1081 if (vecp == NULL) {
1082 lock_clear(&apix_lock);
1083 cmn_err(CE_CONT, "Invalid interrupt 0x%x,0x%x to remove",
1084 APIX_VIRTVEC_CPU(virt_vect),
1085 APIX_VIRTVEC_VECTOR(virt_vect));
1086 return;
1087 }
1088
1089 if (vecp->v_state <= APIX_STATE_OBSOLETED ||
1090 ((avp = apix_find_av(vecp, intr_id, f)) == NULL)) {
1091 /*
1092 * It's possible that the interrupt is rebound to a
1093 * different cpu before rem_avintr() is called. Search
1094 * through all vectors once it happens.
1095 */
1096 if ((vecp = apix_find_vector_by_avintr(intr_id, f))
1097 == NULL) {
1098 lock_clear(&apix_lock);
1099 cmn_err(CE_CONT, "Unknown interrupt 0x%x,0x%x "
1100 "for %p to remove", APIX_VIRTVEC_CPU(virt_vect),
1101 APIX_VIRTVEC_VECTOR(virt_vect), intr_id);
1102 return;
1103 }
1104 virt_vect = APIX_VIRTVECTOR(vecp->v_cpuid, vecp->v_vector);
1105 avp = apix_find_av(vecp, intr_id, f);
1106 }
1107 cpuid = vecp->v_cpuid;
1108
1109 /* disable interrupt */
1110 (void) apix_delspl(virt_vect, ipl, 0, 0);
1111
1112 /* remove ISR entry */
1113 APIX_ENTER_CPU_LOCK(cpuid);
1114 apix_remove_av(vecp, avp);
1115 APIX_LEAVE_CPU_LOCK(cpuid);
1116
1117 lock_clear(&apix_lock);
1118 }
1119
1120 /*
1121 * Device to vector mapping table
1122 */
1123
1124 static void
1125 apix_clear_dev_map(dev_info_t *dip, int inum, int type)
1126 {
1127 char *name;
1128 major_t major;
1129 apix_dev_vector_t *dvp, *prev = NULL;
1130 int found = 0;
1131
1132 name = ddi_get_name(dip);
1133 major = ddi_name_to_major(name);
1134
1135 mutex_enter(&apix_mutex);
1136
1137 for (dvp = apix_dev_vector[major]; dvp != NULL;
1138 prev = dvp, dvp = dvp->dv_next) {
1139 if (dvp->dv_dip == dip && dvp->dv_inum == inum &&
1140 dvp->dv_type == type) {
1141 found++;
1142 break;
1143 }
1144 }
1145
1146 if (!found) {
1147 mutex_exit(&apix_mutex);
1148 return;
1149 }
1150
1151 if (prev != NULL)
1152 prev->dv_next = dvp->dv_next;
1153
1154 if (apix_dev_vector[major] == dvp)
1155 apix_dev_vector[major] = dvp->dv_next;
1156
1157 dvp->dv_vector->v_devp = NULL;
1158
1159 mutex_exit(&apix_mutex);
1160
1161 kmem_free(dvp, sizeof (apix_dev_vector_t));
1162 }
1163
1164 void
1165 apix_set_dev_map(apix_vector_t *vecp, dev_info_t *dip, int inum)
1166 {
1167 apix_dev_vector_t *dvp;
1168 char *name;
1169 major_t major;
1170 uint32_t found = 0;
1171
1172 ASSERT(dip != NULL);
1173 name = ddi_get_name(dip);
1174 major = ddi_name_to_major(name);
1175
1176 mutex_enter(&apix_mutex);
1177
1178 for (dvp = apix_dev_vector[major]; dvp != NULL;
1179 dvp = dvp->dv_next) {
1180 if (dvp->dv_dip == dip && dvp->dv_inum == inum &&
1181 dvp->dv_type == vecp->v_type) {
1182 found++;
1183 break;
1184 }
1185 }
1186
1187 if (found == 0) { /* not found */
1188 dvp = kmem_zalloc(sizeof (apix_dev_vector_t), KM_SLEEP);
1189 dvp->dv_dip = dip;
1190 dvp->dv_inum = inum;
1191 dvp->dv_type = vecp->v_type;
1192
1193 dvp->dv_next = apix_dev_vector[major];
1194 apix_dev_vector[major] = dvp;
1195 }
1196 dvp->dv_vector = vecp;
1197 vecp->v_devp = dvp;
1198
1199 mutex_exit(&apix_mutex);
1200
1201 DDI_INTR_IMPLDBG((CE_CONT, "apix_set_dev_map: dip=0x%p "
1202 "inum=0x%x vector=0x%x/0x%x\n",
1203 (void *)dip, inum, vecp->v_cpuid, vecp->v_vector));
1204 }
1205
1206 apix_vector_t *
1207 apix_get_dev_map(dev_info_t *dip, int inum, int type)
1208 {
1209 char *name;
1210 major_t major;
1211 apix_dev_vector_t *dvp;
1212 apix_vector_t *vecp;
1213
1214 name = ddi_get_name(dip);
1215 if ((major = ddi_name_to_major(name)) == DDI_MAJOR_T_NONE)
1216 return (NULL);
1217
1218 mutex_enter(&apix_mutex);
1219 for (dvp = apix_dev_vector[major]; dvp != NULL;
1220 dvp = dvp->dv_next) {
1221 if (dvp->dv_dip == dip && dvp->dv_inum == inum &&
1222 dvp->dv_type == type) {
1223 vecp = dvp->dv_vector;
1224 mutex_exit(&apix_mutex);
1225 return (vecp);
1226 }
1227 }
1228 mutex_exit(&apix_mutex);
1229
1230 return (NULL);
1231 }
1232
1233 /*
1234 * Get minimum inum for specified device, used for MSI
1235 */
1236 int
1237 apix_get_min_dev_inum(dev_info_t *dip, int type)
1238 {
1239 char *name;
1240 major_t major;
1241 apix_dev_vector_t *dvp;
1242 int inum = -1;
1243
1244 name = ddi_get_name(dip);
1245 major = ddi_name_to_major(name);
1246
1247 mutex_enter(&apix_mutex);
1248 for (dvp = apix_dev_vector[major]; dvp != NULL;
1249 dvp = dvp->dv_next) {
1250 if (dvp->dv_dip == dip && dvp->dv_type == type) {
1251 if (inum == -1)
1252 inum = dvp->dv_inum;
1253 else
1254 inum = (dvp->dv_inum < inum) ?
1255 dvp->dv_inum : inum;
1256 }
1257 }
1258 mutex_exit(&apix_mutex);
1259
1260 return (inum);
1261 }
1262
1263 int
1264 apix_get_max_dev_inum(dev_info_t *dip, int type)
1265 {
1266 char *name;
1267 major_t major;
1268 apix_dev_vector_t *dvp;
1269 int inum = -1;
1270
1271 name = ddi_get_name(dip);
1272 major = ddi_name_to_major(name);
1273
1274 mutex_enter(&apix_mutex);
1275 for (dvp = apix_dev_vector[major]; dvp != NULL;
1276 dvp = dvp->dv_next) {
1277 if (dvp->dv_dip == dip && dvp->dv_type == type) {
1278 if (inum == -1)
1279 inum = dvp->dv_inum;
1280 else
1281 inum = (dvp->dv_inum > inum) ?
1282 dvp->dv_inum : inum;
1283 }
1284 }
1285 mutex_exit(&apix_mutex);
1286
1287 return (inum);
1288 }
1289
1290 /*
1291 * Major to cpu binding, for INTR_ROUND_ROBIN_WITH_AFFINITY cpu
1292 * binding policy
1293 */
1294
1295 static uint32_t
1296 apix_get_dev_binding(dev_info_t *dip)
1297 {
1298 major_t major;
1299 char *name;
1300 uint32_t cpu = IRQ_UNINIT;
1301
1302 name = ddi_get_name(dip);
1303 major = ddi_name_to_major(name);
1304 if (major < devcnt) {
1305 mutex_enter(&apix_mutex);
1306 cpu = apix_major_to_cpu[major];
1307 mutex_exit(&apix_mutex);
1308 }
1309
1310 return (cpu);
1311 }
1312
1313 static void
1314 apix_set_dev_binding(dev_info_t *dip, uint32_t cpu)
1315 {
1316 major_t major;
1317 char *name;
1318
1319 /* setup major to cpu mapping */
1320 name = ddi_get_name(dip);
1321 major = ddi_name_to_major(name);
1322 if (apix_major_to_cpu[major] == IRQ_UNINIT) {
1323 mutex_enter(&apix_mutex);
1324 apix_major_to_cpu[major] = cpu;
1325 mutex_exit(&apix_mutex);
1326 }
1327 }
1328
1329 /*
1330 * return the cpu to which this intr should be bound.
1331 * Check properties or any other mechanism to see if user wants it
1332 * bound to a specific CPU. If so, return the cpu id with high bit set.
1333 * If not, use the policy to choose a cpu and return the id.
1334 */
1335 uint32_t
1336 apix_bind_cpu(dev_info_t *dip)
1337 {
1338 int instance, instno, prop_len, bind_cpu, count;
1339 uint_t i, rc;
1340 major_t major;
1341 char *name, *drv_name, *prop_val, *cptr;
1342 char prop_name[32];
1343
1344 lock_set(&apix_lock);
1345
1346 if (apic_intr_policy == INTR_LOWEST_PRIORITY) {
1347 cmn_err(CE_WARN, "apix: unsupported interrupt binding policy "
1348 "LOWEST PRIORITY, use ROUND ROBIN instead");
1349 apic_intr_policy = INTR_ROUND_ROBIN;
1350 }
1351
1352 if (apic_nproc == 1) {
1353 lock_clear(&apix_lock);
1354 return (0);
1355 }
1356
1357 drv_name = NULL;
1358 rc = DDI_PROP_NOT_FOUND;
1359 major = (major_t)-1;
1360 if (dip != NULL) {
1361 name = ddi_get_name(dip);
1362 major = ddi_name_to_major(name);
1363 drv_name = ddi_major_to_name(major);
1364 instance = ddi_get_instance(dip);
1365 if (apic_intr_policy == INTR_ROUND_ROBIN_WITH_AFFINITY) {
1366 bind_cpu = apix_get_dev_binding(dip);
1367 if (bind_cpu != IRQ_UNINIT) {
1368 lock_clear(&apix_lock);
1369 return (bind_cpu);
1370 }
1371 }
1372 /*
1373 * search for "drvname"_intpt_bind_cpus property first, the
1374 * syntax of the property should be "a[,b,c,...]" where
1375 * instance 0 binds to cpu a, instance 1 binds to cpu b,
1376 * instance 3 binds to cpu c...
1377 * ddi_getlongprop() will search /option first, then /
1378 * if "drvname"_intpt_bind_cpus doesn't exist, then find
1379 * intpt_bind_cpus property. The syntax is the same, and
1380 * it applies to all the devices if its "drvname" specific
1381 * property doesn't exist
1382 */
1383 (void) strcpy(prop_name, drv_name);
1384 (void) strcat(prop_name, "_intpt_bind_cpus");
1385 rc = ddi_getlongprop(DDI_DEV_T_ANY, dip, 0, prop_name,
1386 (caddr_t)&prop_val, &prop_len);
1387 if (rc != DDI_PROP_SUCCESS) {
1388 rc = ddi_getlongprop(DDI_DEV_T_ANY, dip, 0,
1389 "intpt_bind_cpus", (caddr_t)&prop_val, &prop_len);
1390 }
1391 }
1392 if (rc == DDI_PROP_SUCCESS) {
1393 for (i = count = 0; i < (prop_len - 1); i++)
1394 if (prop_val[i] == ',')
1395 count++;
1396 if (prop_val[i-1] != ',')
1397 count++;
1398 /*
1399 * if somehow the binding instances defined in the
1400 * property are not enough for this instno., then
1401 * reuse the pattern for the next instance until
1402 * it reaches the requested instno
1403 */
1404 instno = instance % count;
1405 i = 0;
1406 cptr = prop_val;
1407 while (i < instno)
1408 if (*cptr++ == ',')
1409 i++;
1410 bind_cpu = stoi(&cptr);
1411 kmem_free(prop_val, prop_len);
1412 /* if specific cpu is bogus, then default to cpu 0 */
1413 if (bind_cpu >= apic_nproc) {
1414 cmn_err(CE_WARN, "apix: %s=%s: CPU %d not present",
1415 prop_name, prop_val, bind_cpu);
1416 bind_cpu = 0;
1417 } else {
1418 /* indicate that we are bound at user request */
1419 bind_cpu |= IRQ_USER_BOUND;
1420 }
1421 /*
1422 * no need to check apic_cpus[].aci_status, if specific cpu is
1423 * not up, then post_cpu_start will handle it.
1424 */
1425 } else {
1426 bind_cpu = apic_get_next_bind_cpu();
1427 }
1428
1429 lock_clear(&apix_lock);
1430
1431 return ((uint32_t)bind_cpu);
1432 }
1433
1434 static boolean_t
1435 apix_is_cpu_enabled(processorid_t cpuid)
1436 {
1437 apic_cpus_info_t *cpu_infop;
1438
1439 cpu_infop = &apic_cpus[cpuid];
1440
1441 if ((cpu_infop->aci_status & APIC_CPU_INTR_ENABLE) == 0)
1442 return (B_FALSE);
1443
1444 return (B_TRUE);
1445 }
1446
1447 /*
1448 * Must be called with apix_lock held. This function can be
1449 * called from above lock level by apix_intr_redistribute().
1450 *
1451 * Arguments:
1452 * vecp : Vector to be rebound
1453 * tocpu : Target cpu. IRQ_UNINIT means target is vecp->v_cpuid.
1454 * count : Number of continuous vectors
1455 *
1456 * Return new vector being bound to
1457 */
1458 apix_vector_t *
1459 apix_rebind(apix_vector_t *vecp, processorid_t newcpu, int count)
1460 {
1461 apix_vector_t *newp, *oldp;
1462 processorid_t oldcpu = vecp->v_cpuid;
1463 uchar_t newvec, oldvec = vecp->v_vector;
1464 int i;
1465
1466 ASSERT(LOCK_HELD(&apix_lock) && count > 0);
1467
1468 if (!apix_is_cpu_enabled(newcpu))
1469 return (NULL);
1470
1471 if (vecp->v_cpuid == newcpu) /* rebind to the same cpu */
1472 return (vecp);
1473
1474 APIX_ENTER_CPU_LOCK(oldcpu);
1475 APIX_ENTER_CPU_LOCK(newcpu);
1476
1477 /* allocate vector */
1478 if (count == 1)
1479 newp = apix_alloc_vector_oncpu(newcpu, NULL, 0, vecp->v_type);
1480 else {
1481 ASSERT(vecp->v_type == APIX_TYPE_MSI);
1482 newp = apix_alloc_nvectors_oncpu(newcpu, NULL, 0, count,
1483 vecp->v_type);
1484 }
1485 if (newp == NULL) {
1486 APIX_LEAVE_CPU_LOCK(newcpu);
1487 APIX_LEAVE_CPU_LOCK(oldcpu);
1488 return (NULL);
1489 }
1490
1491 newvec = newp->v_vector;
1492 apix_dup_vectors(vecp, newp, count);
1493
1494 APIX_LEAVE_CPU_LOCK(newcpu);
1495 APIX_LEAVE_CPU_LOCK(oldcpu);
1496
1497 if (!DDI_INTR_IS_MSI_OR_MSIX(vecp->v_type)) {
1498 ASSERT(count == 1);
1499 if (apix_intx_rebind(vecp->v_inum, newcpu, newvec) != 0) {
1500 struct autovec *avp;
1501 int inum;
1502
1503 /* undo duplication */
1504 APIX_ENTER_CPU_LOCK(oldcpu);
1505 APIX_ENTER_CPU_LOCK(newcpu);
1506 for (avp = newp->v_autovect; avp != NULL;
1507 avp = avp->av_link) {
1508 if (avp->av_dip != NULL) {
1509 inum = GET_INTR_INUM(avp->av_intr_id);
1510 apix_set_dev_map(vecp, avp->av_dip,
1511 inum);
1512 }
1513 apix_remove_av(newp, avp);
1514 }
1515 apix_cleanup_vector(newp);
1516 APIX_LEAVE_CPU_LOCK(newcpu);
1517 APIX_LEAVE_CPU_LOCK(oldcpu);
1518 APIC_VERBOSE(REBIND, (CE_CONT, "apix: rebind fixed "
1519 "interrupt 0x%x to cpu %d failed\n",
1520 vecp->v_inum, newcpu));
1521 return (NULL);
1522 }
1523
1524 APIX_ENTER_CPU_LOCK(oldcpu);
1525 (void) apix_obsolete_vector(vecp);
1526 APIX_LEAVE_CPU_LOCK(oldcpu);
1527 APIC_VERBOSE(REBIND, (CE_CONT, "apix: rebind fixed interrupt"
1528 " 0x%x/0x%x to 0x%x/0x%x\n",
1529 oldcpu, oldvec, newcpu, newvec));
1530 return (newp);
1531 }
1532
1533 for (i = 0; i < count; i++) {
1534 oldp = xv_vector(oldcpu, oldvec + i);
1535 newp = xv_vector(newcpu, newvec + i);
1536
1537 if (newp->v_share > 0) {
1538 APIX_SET_REBIND_INFO(oldp, newp);
1539
1540 apix_enable_vector(newp);
1541
1542 APIX_CLR_REBIND_INFO();
1543 }
1544
1545 APIX_ENTER_CPU_LOCK(oldcpu);
1546 (void) apix_obsolete_vector(oldp);
1547 APIX_LEAVE_CPU_LOCK(oldcpu);
1548 }
1549 APIC_VERBOSE(REBIND, (CE_CONT, "apix: rebind vector 0x%x/0x%x "
1550 "to 0x%x/0x%x, count=%d\n",
1551 oldcpu, oldvec, newcpu, newvec, count));
1552
1553 return (xv_vector(newcpu, newvec));
1554 }
1555
1556 /*
1557 * Senarios include:
1558 * a. add_avintr() is called before irqp initialized (legacy)
1559 * b. irqp is initialized, vector is not allocated (fixed interrupts)
1560 * c. irqp is initialized, vector is allocated (shared interrupts)
1561 */
1562 apix_vector_t *
1563 apix_alloc_intx(dev_info_t *dip, int inum, int irqno)
1564 {
1565 apic_irq_t *irqp;
1566 apix_vector_t *vecp;
1567
1568 /*
1569 * Allocate IRQ. Caller is later responsible for the
1570 * initialization
1571 */
1572 mutex_enter(&airq_mutex);
1573 if ((irqp = apic_irq_table[irqno]) == NULL) {
1574 /* allocate irq */
1575 irqp = kmem_zalloc(sizeof (apic_irq_t), KM_SLEEP);
1576 irqp->airq_mps_intr_index = FREE_INDEX;
1577 apic_irq_table[irqno] = irqp;
1578 }
1579 if (irqp->airq_mps_intr_index == FREE_INDEX) {
1580 irqp->airq_mps_intr_index = DEFAULT_INDEX;
1581 irqp->airq_cpu = IRQ_UNINIT;
1582 irqp->airq_origirq = (uchar_t)irqno;
1583 }
1584
1585 mutex_exit(&airq_mutex);
1586
1587 /*
1588 * allocate vector
1589 */
1590 if (irqp->airq_cpu == IRQ_UNINIT) {
1591 uint32_t bindcpu, cpuid;
1592
1593 /* select cpu by system policy */
1594 bindcpu = apix_bind_cpu(dip);
1595 cpuid = bindcpu & ~IRQ_USER_BOUND;
1596
1597 /* allocate vector */
1598 APIX_ENTER_CPU_LOCK(cpuid);
1599
1600 if ((vecp = apix_alloc_vector_oncpu(bindcpu, dip, inum,
1601 APIX_TYPE_FIXED)) == NULL) {
1602 cmn_err(CE_WARN, "No interrupt vector for irq %x",
1603 irqno);
1604 APIX_LEAVE_CPU_LOCK(cpuid);
1605 return (NULL);
1606 }
1607 vecp->v_inum = irqno;
1608 vecp->v_flags |= APIX_VECT_MASKABLE;
1609
1610 apix_intx_set_vector(irqno, vecp->v_cpuid, vecp->v_vector);
1611
1612 APIX_LEAVE_CPU_LOCK(cpuid);
1613 } else {
1614 vecp = xv_vector(irqp->airq_cpu, irqp->airq_vector);
1615 ASSERT(!IS_VECT_FREE(vecp));
1616
1617 if (dip != NULL)
1618 apix_set_dev_map(vecp, dip, inum);
1619 }
1620
1621 if ((dip != NULL) &&
1622 (apic_intr_policy == INTR_ROUND_ROBIN_WITH_AFFINITY) &&
1623 ((vecp->v_flags & APIX_VECT_USER_BOUND) == 0))
1624 apix_set_dev_binding(dip, vecp->v_cpuid);
1625
1626 apix_dprint_vector(vecp, dip, 1);
1627
1628 return (vecp);
1629 }
1630
1631 int
1632 apix_alloc_msi(dev_info_t *dip, int inum, int count, int behavior)
1633 {
1634 int i, cap_ptr, rcount = count;
1635 apix_vector_t *vecp;
1636 processorid_t bindcpu, cpuid;
1637 ushort_t msi_ctrl;
1638 ddi_acc_handle_t handle;
1639
1640 DDI_INTR_IMPLDBG((CE_CONT, "apix_alloc_msi_vectors: dip=0x%p "
1641 "inum=0x%x count=0x%x behavior=%d\n",
1642 (void *)dip, inum, count, behavior));
1643
1644 if (count > 1) {
1645 if (behavior == DDI_INTR_ALLOC_STRICT &&
1646 apic_multi_msi_enable == 0)
1647 return (0);
1648 if (apic_multi_msi_enable == 0)
1649 count = 1;
1650 }
1651
1652 /* Check whether it supports per-vector masking */
1653 cap_ptr = i_ddi_get_msi_msix_cap_ptr(dip);
1654 handle = i_ddi_get_pci_config_handle(dip);
1655 msi_ctrl = pci_config_get16(handle, cap_ptr + PCI_MSI_CTRL);
1656
1657 /* bind to cpu */
1658 bindcpu = apix_bind_cpu(dip);
1659 cpuid = bindcpu & ~IRQ_USER_BOUND;
1660
1661 /* if not ISP2, then round it down */
1662 if (!ISP2(rcount))
1663 rcount = 1 << (highbit(rcount) - 1);
1664
1665 APIX_ENTER_CPU_LOCK(cpuid);
1666 for (vecp = NULL; rcount > 0; rcount >>= 1) {
1667 vecp = apix_alloc_nvectors_oncpu(bindcpu, dip, inum, rcount,
1668 APIX_TYPE_MSI);
1669 if (vecp != NULL || behavior == DDI_INTR_ALLOC_STRICT)
1670 break;
1671 }
1672 for (i = 0; vecp && i < rcount; i++)
1673 xv_vector(vecp->v_cpuid, vecp->v_vector + i)->v_flags |=
1674 (msi_ctrl & PCI_MSI_PVM_MASK) ? APIX_VECT_MASKABLE : 0;
1675 APIX_LEAVE_CPU_LOCK(cpuid);
1676 if (vecp == NULL) {
1677 APIC_VERBOSE(INTR, (CE_CONT,
1678 "apix_alloc_msi: no %d cont vectors found on cpu 0x%x\n",
1679 count, bindcpu));
1680 return (0);
1681 }
1682
1683 /* major to cpu binding */
1684 if ((apic_intr_policy == INTR_ROUND_ROBIN_WITH_AFFINITY) &&
1685 ((vecp->v_flags & APIX_VECT_USER_BOUND) == 0))
1686 apix_set_dev_binding(dip, vecp->v_cpuid);
1687
1688 apix_dprint_vector(vecp, dip, rcount);
1689
1690 return (rcount);
1691 }
1692
1693 int
1694 apix_alloc_msix(dev_info_t *dip, int inum, int count, int behavior)
1695 {
1696 apix_vector_t *vecp;
1697 processorid_t bindcpu, cpuid;
1698 int i;
1699
1700 for (i = 0; i < count; i++) {
1701 /* select cpu by system policy */
1702 bindcpu = apix_bind_cpu(dip);
1703 cpuid = bindcpu & ~IRQ_USER_BOUND;
1704
1705 /* allocate vector */
1706 APIX_ENTER_CPU_LOCK(cpuid);
1707 if ((vecp = apix_alloc_vector_oncpu(bindcpu, dip, inum + i,
1708 APIX_TYPE_MSIX)) == NULL) {
1709 APIX_LEAVE_CPU_LOCK(cpuid);
1710 APIC_VERBOSE(INTR, (CE_CONT, "apix_alloc_msix: "
1711 "allocate msix for device dip=%p, inum=%d on"
1712 " cpu %d failed", (void *)dip, inum + i, bindcpu));
1713 break;
1714 }
1715 vecp->v_flags |= APIX_VECT_MASKABLE;
1716 APIX_LEAVE_CPU_LOCK(cpuid);
1717
1718 /* major to cpu mapping */
1719 if ((i == 0) &&
1720 (apic_intr_policy == INTR_ROUND_ROBIN_WITH_AFFINITY) &&
1721 ((vecp->v_flags & APIX_VECT_USER_BOUND) == 0))
1722 apix_set_dev_binding(dip, vecp->v_cpuid);
1723
1724 apix_dprint_vector(vecp, dip, 1);
1725 }
1726
1727 if (i < count && behavior == DDI_INTR_ALLOC_STRICT) {
1728 APIC_VERBOSE(INTR, (CE_WARN, "apix_alloc_msix: "
1729 "strictly allocate %d vectors failed, got %d\n",
1730 count, i));
1731 apix_free_vectors(dip, inum, i, APIX_TYPE_MSIX);
1732 i = 0;
1733 }
1734
1735 return (i);
1736 }
1737
1738 /*
1739 * A rollback free for vectors allocated by apix_alloc_xxx().
1740 */
1741 void
1742 apix_free_vectors(dev_info_t *dip, int inum, int count, int type)
1743 {
1744 int i, cpuid;
1745 apix_vector_t *vecp;
1746
1747 DDI_INTR_IMPLDBG((CE_CONT, "apix_free_vectors: dip: %p inum: %x "
1748 "count: %x type: %x\n",
1749 (void *)dip, inum, count, type));
1750
1751 lock_set(&apix_lock);
1752
1753 for (i = 0; i < count; i++, inum++) {
1754 if ((vecp = apix_get_dev_map(dip, inum, type)) == NULL) {
1755 lock_clear(&apix_lock);
1756 DDI_INTR_IMPLDBG((CE_CONT, "apix_free_vectors: "
1757 "dip=0x%p inum=0x%x type=0x%x apix_find_intr() "
1758 "failed\n", (void *)dip, inum, type));
1759 continue;
1760 }
1761
1762 APIX_ENTER_CPU_LOCK(vecp->v_cpuid);
1763 cpuid = vecp->v_cpuid;
1764
1765 DDI_INTR_IMPLDBG((CE_CONT, "apix_free_vectors: "
1766 "dip=0x%p inum=0x%x type=0x%x vector 0x%x (share %d)\n",
1767 (void *)dip, inum, type, vecp->v_vector, vecp->v_share));
1768
1769 /* tear down device interrupt to vector mapping */
1770 apix_clear_dev_map(dip, inum, type);
1771
1772 if (vecp->v_type == APIX_TYPE_FIXED) {
1773 if (vecp->v_share > 0) { /* share IRQ line */
1774 APIX_LEAVE_CPU_LOCK(cpuid);
1775 continue;
1776 }
1777
1778 /* Free apic_irq_table entry */
1779 apix_intx_free(vecp->v_inum);
1780 }
1781
1782 /* free vector */
1783 apix_cleanup_vector(vecp);
1784
1785 APIX_LEAVE_CPU_LOCK(cpuid);
1786 }
1787
1788 lock_clear(&apix_lock);
1789 }
1790
1791 /*
1792 * Must be called with apix_lock held
1793 */
1794 apix_vector_t *
1795 apix_setup_io_intr(apix_vector_t *vecp)
1796 {
1797 processorid_t bindcpu;
1798 int ret;
1799
1800 ASSERT(LOCK_HELD(&apix_lock));
1801
1802 /*
1803 * Interrupts are enabled on the CPU, programme IOAPIC RDT
1804 * entry or MSI/X address/data to enable the interrupt.
1805 */
1806 if (apix_is_cpu_enabled(vecp->v_cpuid)) {
1807 apix_enable_vector(vecp);
1808 return (vecp);
1809 }
1810
1811 /*
1812 * CPU is not up or interrupts are disabled. Fall back to the
1813 * first avialable CPU.
1814 */
1815 bindcpu = apic_find_cpu(APIC_CPU_INTR_ENABLE);
1816
1817 if (vecp->v_type == APIX_TYPE_MSI)
1818 return (apix_grp_set_cpu(vecp, bindcpu, &ret));
1819
1820 return (apix_set_cpu(vecp, bindcpu, &ret));
1821 }
1822
1823 /*
1824 * For interrupts which call add_avintr() before apic is initialized.
1825 * ioapix_setup_intr() will
1826 * - allocate vector
1827 * - copy over ISR
1828 */
1829 static void
1830 ioapix_setup_intr(int irqno, iflag_t *flagp)
1831 {
1832 extern struct av_head autovect[];
1833 apix_vector_t *vecp;
1834 apic_irq_t *irqp;
1835 uchar_t ioapicindex, ipin;
1836 ulong_t iflag;
1837 struct autovec *avp;
1838
1839 ioapicindex = acpi_find_ioapic(irqno);
1840 ASSERT(ioapicindex != 0xFF);
1841 ipin = irqno - apic_io_vectbase[ioapicindex];
1842
1843 mutex_enter(&airq_mutex);
1844 irqp = apic_irq_table[irqno];
1845
1846 /*
1847 * The irq table entry shouldn't exist unless the interrupts are shared.
1848 * In that case, make sure it matches what we would initialize it to.
1849 */
1850 if (irqp != NULL) {
1851 ASSERT(irqp->airq_mps_intr_index == ACPI_INDEX);
1852 ASSERT(irqp->airq_intin_no == ipin &&
1853 irqp->airq_ioapicindex == ioapicindex);
1854 vecp = xv_vector(irqp->airq_cpu, irqp->airq_vector);
1855 ASSERT(!IS_VECT_FREE(vecp));
1856 mutex_exit(&airq_mutex);
1857 } else {
1858 irqp = kmem_zalloc(sizeof (apic_irq_t), KM_SLEEP);
1859
1860 irqp->airq_cpu = IRQ_UNINIT;
1861 irqp->airq_origirq = (uchar_t)irqno;
1862 irqp->airq_mps_intr_index = ACPI_INDEX;
1863 irqp->airq_ioapicindex = ioapicindex;
1864 irqp->airq_intin_no = ipin;
1865 irqp->airq_iflag = *flagp;
1866 irqp->airq_share++;
1867
1868 apic_irq_table[irqno] = irqp;
1869 mutex_exit(&airq_mutex);
1870
1871 vecp = apix_alloc_intx(NULL, 0, irqno);
1872 }
1873
1874 /* copy over autovect */
1875 for (avp = autovect[irqno].avh_link; avp; avp = avp->av_link)
1876 apix_insert_av(vecp, avp->av_intr_id, avp->av_vector,
1877 avp->av_intarg1, avp->av_intarg2, avp->av_ticksp,
1878 avp->av_prilevel, avp->av_dip);
1879
1880 /* Program I/O APIC */
1881 iflag = intr_clear();
1882 lock_set(&apix_lock);
1883
1884 (void) apix_setup_io_intr(vecp);
1885
1886 lock_clear(&apix_lock);
1887 intr_restore(iflag);
1888
1889 APIC_VERBOSE_IOAPIC((CE_CONT, "apix: setup ioapic, irqno %x "
1890 "(ioapic %x, ipin %x) is bound to cpu %x, vector %x\n",
1891 irqno, ioapicindex, ipin, irqp->airq_cpu, irqp->airq_vector));
1892 }
1893
1894 void
1895 ioapix_init_intr(int mask_apic)
1896 {
1897 int ioapicindex;
1898 int i, j;
1899
1900 /* mask interrupt vectors */
1901 for (j = 0; j < apic_io_max && mask_apic; j++) {
1902 int intin_max;
1903
1904 ioapicindex = j;
1905 /* Bits 23-16 define the maximum redirection entries */
1906 intin_max = (ioapic_read(ioapicindex, APIC_VERS_CMD) >> 16)
1907 & 0xff;
1908 for (i = 0; i <= intin_max; i++)
1909 ioapic_write(ioapicindex, APIC_RDT_CMD + 2 * i,
1910 AV_MASK);
1911 }
1912
1913 /*
1914 * Hack alert: deal with ACPI SCI interrupt chicken/egg here
1915 */
1916 if (apic_sci_vect > 0)
1917 ioapix_setup_intr(apic_sci_vect, &apic_sci_flags);
1918
1919 /*
1920 * Hack alert: deal with ACPI HPET interrupt chicken/egg here.
1921 */
1922 if (apic_hpet_vect > 0)
1923 ioapix_setup_intr(apic_hpet_vect, &apic_hpet_flags);
1924 }