2 * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * Machine dependent interrupt code for i386. For the i386, we have to
34 * deal with different PICs. Thus, we use the passed in vector to lookup
35 * an interrupt source associated with that vector. The interrupt source
36 * describes which PIC the source belongs to and includes methods to handle
42 #include <sys/param.h>
44 #include <sys/interrupt.h>
46 #include <sys/kernel.h>
48 #include <sys/mutex.h>
51 #include <sys/syslog.h>
52 #include <sys/systm.h>
54 #include <machine/clock.h>
55 #include <machine/intr_machdep.h>
56 #include <machine/smp.h>
61 #define MAX_STRAY_LOG 5
63 typedef void (*mask_fn)(void *);
65 static int intrcnt_index;
66 static struct intsrc *interrupt_sources[NUM_IO_INTS];
67 static struct sx intr_table_lock;
68 static struct mtx intrcnt_lock;
69 static STAILQ_HEAD(, pic) pics;
72 static void intr_eoi_src(void *arg);
73 static void intr_disab_eoi_src(void *arg);
74 static void intr_event_stray(void *cookie);
78 static int assign_cpu;
80 static void intr_assign_next_cpu(struct intsrc *isrc);
83 static int intr_assign_cpu(void *arg, u_char cpu);
84 static void intr_init(void *__dummy);
85 static int intr_pic_registered(struct pic *pic);
86 static void intrcnt_setname(const char *name, int index);
87 static void intrcnt_updatename(struct intsrc *is);
88 static void intrcnt_register(struct intsrc *is);
91 intr_pic_registered(struct pic *pic)
95 STAILQ_FOREACH(p, &pics, pics) {
103 * Register a new interrupt controller (PIC). This is to support suspend
104 * and resume where we suspend/resume controllers rather than individual
105 * sources. This also allows controllers with no active sources (such as
106 * 8259As in a system using the APICs) to participate in suspend and resume.
109 intr_register_pic(struct pic *pic)
113 sx_xlock(&intr_table_lock);
114 if (intr_pic_registered(pic))
117 STAILQ_INSERT_TAIL(&pics, pic, pics);
120 sx_xunlock(&intr_table_lock);
125 * Register a new interrupt source with the global interrupt system.
126 * The global interrupts need to be disabled when this function is
130 intr_register_source(struct intsrc *isrc)
134 KASSERT(intr_pic_registered(isrc->is_pic), ("unregistered PIC"));
135 vector = isrc->is_pic->pic_vector(isrc);
136 if (interrupt_sources[vector] != NULL)
139 error = intr_event_create(&isrc->is_event, isrc, 0,
140 (mask_fn)isrc->is_pic->pic_enable_source,
141 intr_eoi_src, intr_disab_eoi_src, intr_assign_cpu, "irq%d:",
144 error = intr_event_create(&isrc->is_event, isrc, 0,
145 (mask_fn)isrc->is_pic->pic_enable_source, intr_assign_cpu, "irq%d:",
150 sx_xlock(&intr_table_lock);
151 if (interrupt_sources[vector] != NULL) {
152 sx_xunlock(&intr_table_lock);
153 intr_event_destroy(isrc->is_event);
156 intrcnt_register(isrc);
157 interrupt_sources[vector] = isrc;
158 isrc->is_handlers = 0;
159 sx_xunlock(&intr_table_lock);
164 intr_lookup_source(int vector)
167 return (interrupt_sources[vector]);
171 intr_add_handler(const char *name, int vector, driver_filter_t filter,
172 driver_intr_t handler, void *arg, enum intr_type flags, void **cookiep)
177 isrc = intr_lookup_source(vector);
180 error = intr_event_add_handler(isrc->is_event, name, filter, handler,
181 arg, intr_priority(flags), flags, cookiep);
183 sx_xlock(&intr_table_lock);
184 intrcnt_updatename(isrc);
186 if (isrc->is_handlers == 1) {
189 intr_assign_next_cpu(isrc);
191 isrc->is_pic->pic_enable_intr(isrc);
192 isrc->is_pic->pic_enable_source(isrc);
194 sx_xunlock(&intr_table_lock);
200 intr_remove_handler(void *cookie)
205 isrc = intr_handler_source(cookie);
206 error = intr_event_remove_handler(cookie);
208 sx_xlock(&intr_table_lock);
210 if (isrc->is_handlers == 0) {
211 isrc->is_pic->pic_disable_source(isrc, PIC_NO_EOI);
212 isrc->is_pic->pic_disable_intr(isrc);
214 intrcnt_updatename(isrc);
215 sx_xunlock(&intr_table_lock);
221 intr_config_intr(int vector, enum intr_trigger trig, enum intr_polarity pol)
225 isrc = intr_lookup_source(vector);
228 return (isrc->is_pic->pic_config_intr(isrc, trig, pol));
233 intr_execute_handlers(struct intsrc *isrc, struct trapframe *frame)
236 struct intr_event *ie;
242 * We count software interrupts when we process them. The
243 * code here follows previous practice, but there's an
244 * argument for counting hardware interrupts when they're
248 PCPU_INC(cnt.v_intr);
253 * XXX: We assume that IRQ 0 is only used for the ISA timer
256 vector = isrc->is_pic->pic_vector(isrc);
260 if (intr_event_handle(ie, frame) != 0)
261 intr_event_stray(isrc);
265 intr_event_stray(void *cookie)
271 * For stray interrupts, mask and EOI the source, bump the
272 * stray count, and log the condition.
274 isrc->is_pic->pic_disable_source(isrc, PIC_EOI);
275 (*isrc->is_straycount)++;
276 if (*isrc->is_straycount < MAX_STRAY_LOG)
277 log(LOG_ERR, "stray irq%d\n", isrc->is_pic->pic_vector(isrc));
278 else if (*isrc->is_straycount == MAX_STRAY_LOG)
280 "too many stray irq %d's: not logging anymore\n",
281 isrc->is_pic->pic_vector(isrc));
285 intr_eoi_src(void *arg)
290 isrc->is_pic->pic_eoi_source(isrc);
294 intr_disab_eoi_src(void *arg)
299 isrc->is_pic->pic_disable_source(isrc, PIC_EOI);
303 intr_execute_handlers(struct intsrc *isrc, struct trapframe *frame)
306 struct intr_event *ie;
307 struct intr_handler *ih;
308 int error, vector, thread, ret;
313 * We count software interrupts when we process them. The
314 * code here follows previous practice, but there's an
315 * argument for counting hardware interrupts when they're
319 PCPU_INC(cnt.v_intr);
324 * XXX: We assume that IRQ 0 is only used for the ISA timer
327 vector = isrc->is_pic->pic_vector(isrc);
332 * For stray interrupts, mask and EOI the source, bump the
333 * stray count, and log the condition.
335 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers)) {
336 isrc->is_pic->pic_disable_source(isrc, PIC_EOI);
337 (*isrc->is_straycount)++;
338 if (*isrc->is_straycount < MAX_STRAY_LOG)
339 log(LOG_ERR, "stray irq%d\n", vector);
340 else if (*isrc->is_straycount == MAX_STRAY_LOG)
342 "too many stray irq %d's: not logging anymore\n",
348 * Execute fast interrupt handlers directly.
349 * To support clock handlers, if a handler registers
350 * with a NULL argument, then we pass it a pointer to
351 * a trapframe as its argument.
353 td->td_intr_nesting_level++;
357 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) {
358 if (ih->ih_filter == NULL) {
362 CTR4(KTR_INTR, "%s: exec %p(%p) for %s", __func__,
363 ih->ih_filter, ih->ih_argument == NULL ? frame :
364 ih->ih_argument, ih->ih_name);
365 if (ih->ih_argument == NULL)
366 ret = ih->ih_filter(frame);
368 ret = ih->ih_filter(ih->ih_argument);
370 * Wrapper handler special handling:
372 * in some particular cases (like pccard and pccbb),
373 * the _real_ device handler is wrapped in a couple of
374 * functions - a filter wrapper and an ithread wrapper.
375 * In this case (and just in this case), the filter wrapper
376 * could ask the system to schedule the ithread and mask
377 * the interrupt source if the wrapped handler is composed
378 * of just an ithread handler.
380 * TODO: write a generic wrapper to avoid people rolling
384 if (ret == FILTER_SCHEDULE_THREAD)
390 * If there are any threaded handlers that need to run,
391 * mask the source as well as sending it an EOI. Otherwise,
392 * just send it an EOI but leave it unmasked.
395 isrc->is_pic->pic_disable_source(isrc, PIC_EOI);
397 isrc->is_pic->pic_eoi_source(isrc);
399 /* Schedule the ithread if needed. */
401 error = intr_event_schedule_thread(ie);
402 KASSERT(error == 0, ("bad stray interrupt"));
405 td->td_intr_nesting_level--;
414 sx_xlock(&intr_table_lock);
415 STAILQ_FOREACH(pic, &pics, pics) {
416 if (pic->pic_resume != NULL)
417 pic->pic_resume(pic);
419 sx_xunlock(&intr_table_lock);
427 sx_xlock(&intr_table_lock);
428 STAILQ_FOREACH(pic, &pics, pics) {
429 if (pic->pic_suspend != NULL)
430 pic->pic_suspend(pic);
432 sx_xunlock(&intr_table_lock);
436 intr_assign_cpu(void *arg, u_char cpu)
442 * Don't do anything during early boot. We will pick up the
443 * assignment once the APs are started.
445 if (assign_cpu && cpu != NOCPU) {
447 sx_xlock(&intr_table_lock);
448 isrc->is_pic->pic_assign_cpu(isrc, cpu_apic_ids[cpu]);
449 sx_xunlock(&intr_table_lock);
458 intrcnt_setname(const char *name, int index)
461 snprintf(intrnames + (MAXCOMLEN + 1) * index, MAXCOMLEN + 1, "%-*s",
466 intrcnt_updatename(struct intsrc *is)
469 intrcnt_setname(is->is_event->ie_fullname, is->is_index);
473 intrcnt_register(struct intsrc *is)
475 char straystr[MAXCOMLEN + 1];
477 KASSERT(is->is_event != NULL, ("%s: isrc with no event", __func__));
478 mtx_lock_spin(&intrcnt_lock);
479 is->is_index = intrcnt_index;
481 snprintf(straystr, MAXCOMLEN + 1, "stray irq%d",
482 is->is_pic->pic_vector(is));
483 intrcnt_updatename(is);
484 is->is_count = &intrcnt[is->is_index];
485 intrcnt_setname(straystr, is->is_index + 1);
486 is->is_straycount = &intrcnt[is->is_index + 1];
487 mtx_unlock_spin(&intrcnt_lock);
491 intrcnt_add(const char *name, u_long **countp)
494 mtx_lock_spin(&intrcnt_lock);
495 *countp = &intrcnt[intrcnt_index];
496 intrcnt_setname(name, intrcnt_index);
498 mtx_unlock_spin(&intrcnt_lock);
502 intr_init(void *dummy __unused)
505 intrcnt_setname("???", 0);
508 sx_init(&intr_table_lock, "intr sources");
509 mtx_init(&intrcnt_lock, "intrcnt", NULL, MTX_SPIN);
511 SYSINIT(intr_init, SI_SUB_INTR, SI_ORDER_FIRST, intr_init, NULL);
515 * Dump data about interrupt handlers
517 DB_SHOW_COMMAND(irqs, db_show_irqs)
519 struct intsrc **isrc;
522 if (strcmp(modif, "v") == 0)
526 isrc = interrupt_sources;
527 for (i = 0; i < NUM_IO_INTS && !db_pager_quit; i++, isrc++)
529 db_dump_intr_event((*isrc)->is_event, verbose);
535 * Support for balancing interrupt sources across CPUs. For now we just
536 * allocate CPUs round-robin.
539 /* The BSP is always a valid target. */
540 static cpumask_t intr_cpus = (1 << 0);
541 static int current_cpu;
544 intr_assign_next_cpu(struct intsrc *isrc)
548 * Assign this source to a local APIC in a round-robin fashion.
550 isrc->is_pic->pic_assign_cpu(isrc, cpu_apic_ids[current_cpu]);
553 if (current_cpu > mp_maxid)
555 } while (!(intr_cpus & (1 << current_cpu)));
558 /* Attempt to bind the specified IRQ to the specified CPU. */
560 intr_bind(u_int vector, u_char cpu)
564 isrc = intr_lookup_source(vector);
567 return (intr_event_bind(isrc->is_event, cpu));
571 * Add a CPU to our mask of valid CPUs that can be destinations of
575 intr_add_cpu(u_int cpu)
579 panic("%s: Invalid CPU ID", __func__);
581 printf("INTR: Adding local APIC %d as a target\n",
584 intr_cpus |= (1 << cpu);
588 * Distribute all the interrupt sources among the available CPUs once the
589 * AP's have been launched.
592 intr_shuffle_irqs(void *arg __unused)
597 /* Don't bother on UP. */
601 /* Round-robin assign a CPU to each enabled source. */
602 sx_xlock(&intr_table_lock);
604 for (i = 0; i < NUM_IO_INTS; i++) {
605 isrc = interrupt_sources[i];
606 if (isrc != NULL && isrc->is_handlers > 0) {
608 * If this event is already bound to a CPU,
609 * then assign the source to that CPU instead
610 * of picking one via round-robin.
612 if (isrc->is_event->ie_cpu != NOCPU)
613 isrc->is_pic->pic_assign_cpu(isrc,
614 cpu_apic_ids[isrc->is_event->ie_cpu]);
616 intr_assign_next_cpu(isrc);
619 sx_xunlock(&intr_table_lock);
621 SYSINIT(intr_shuffle_irqs, SI_SUB_SMP, SI_ORDER_SECOND, intr_shuffle_irqs,