FreeBSD-5.3/sys/i386/i386/intr_machdep.c
/*-
* Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/sys/i386/i386/intr_machdep.c,v 1.9 2004/08/02 15:31:10 scottl Exp $
*/
/*
* Machine dependent interrupt code for i386. For the i386, we have to
* deal with different PICs. Thus, we use the passed in vector to lookup
* an interrupt source associated with that vector. The interrupt source
* describes which PIC the source belongs to and includes methods to handle
* that source.
*/
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/lock.h>
#include <sys/ktr.h>
#include <sys/kernel.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <machine/clock.h>
#include <machine/intr_machdep.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif
#define MAX_STRAY_LOG 5
typedef void (*mask_fn)(uintptr_t vector);
static int intrcnt_index;
static struct intsrc *interrupt_sources[NUM_IO_INTS];
static struct mtx intr_table_lock;
static void intr_init(void *__dummy);
static void intrcnt_setname(const char *name, int index);
static void intrcnt_updatename(struct intsrc *is);
static void intrcnt_register(struct intsrc *is);
/*
* Register a new interrupt source with the global interrupt system.
* The global interrupts need to be disabled when this function is
* called.
*/
int
intr_register_source(struct intsrc *isrc)
{
int error, vector;
vector = isrc->is_pic->pic_vector(isrc);
if (interrupt_sources[vector] != NULL)
return (EEXIST);
error = ithread_create(&isrc->is_ithread, (uintptr_t)isrc, 0,
(mask_fn)isrc->is_pic->pic_disable_source,
(mask_fn)isrc->is_pic->pic_enable_source, "irq%d:", vector);
if (error)
return (error);
mtx_lock_spin(&intr_table_lock);
if (interrupt_sources[vector] != NULL) {
mtx_unlock_spin(&intr_table_lock);
ithread_destroy(isrc->is_ithread);
return (EEXIST);
}
intrcnt_register(isrc);
interrupt_sources[vector] = isrc;
mtx_unlock_spin(&intr_table_lock);
return (0);
}
struct intsrc *
intr_lookup_source(int vector)
{
return (interrupt_sources[vector]);
}
int
intr_add_handler(const char *name, int vector, driver_intr_t handler,
void *arg, enum intr_type flags, void **cookiep)
{
struct intsrc *isrc;
int error;
isrc = intr_lookup_source(vector);
if (isrc == NULL)
return (EINVAL);
error = ithread_add_handler(isrc->is_ithread, name, handler, arg,
ithread_priority(flags), flags, cookiep);
if (error == 0) {
intrcnt_updatename(isrc);
isrc->is_pic->pic_enable_intr(isrc);
isrc->is_pic->pic_enable_source(isrc);
}
return (error);
}
int
intr_remove_handler(void *cookie)
{
int error;
error = ithread_remove_handler(cookie);
#ifdef XXX
if (error == 0)
intrcnt_updatename(/* XXX */);
#endif
return (error);
}
int
intr_config_intr(int vector, enum intr_trigger trig, enum intr_polarity pol)
{
struct intsrc *isrc;
isrc = intr_lookup_source(vector);
if (isrc == NULL)
return (EINVAL);
return (isrc->is_pic->pic_config_intr(isrc, trig, pol));
}
void
intr_execute_handlers(struct intsrc *isrc, struct intrframe *iframe)
{
struct thread *td;
struct ithd *it;
struct intrhand *ih;
int error, vector;
td = curthread;
td->td_intr_nesting_level++;
/*
* We count software interrupts when we process them. The
* code here follows previous practice, but there's an
* argument for counting hardware interrupts when they're
* processed too.
*/
atomic_add_long(isrc->is_count, 1);
atomic_add_int(&cnt.v_intr, 1);
it = isrc->is_ithread;
if (it == NULL)
ih = NULL;
else
ih = TAILQ_FIRST(&it->it_handlers);
/*
* XXX: We assume that IRQ 0 is only used for the ISA timer
* device (clk).
*/
vector = isrc->is_pic->pic_vector(isrc);
if (vector == 0)
clkintr_pending = 1;
if (ih != NULL && ih->ih_flags & IH_FAST) {
/*
* Execute fast interrupt handlers directly.
* To support clock handlers, if a handler registers
* with a NULL argument, then we pass it a pointer to
* a trapframe as its argument.
*/
critical_enter();
TAILQ_FOREACH(ih, &it->it_handlers, ih_next) {
MPASS(ih->ih_flags & IH_FAST);
CTR3(KTR_INTR, "%s: executing handler %p(%p)",
__func__, ih->ih_handler,
ih->ih_argument == NULL ? iframe :
ih->ih_argument);
if (ih->ih_argument == NULL)
ih->ih_handler(iframe);
else
ih->ih_handler(ih->ih_argument);
}
isrc->is_pic->pic_eoi_source(isrc);
error = 0;
/* XXX */
td->td_pflags &= ~TDP_OWEPREEMPT;
critical_exit();
} else {
/*
* For stray and threaded interrupts, we mask and EOI the
* source.
*/
isrc->is_pic->pic_disable_source(isrc, PIC_EOI);
if (ih == NULL)
error = EINVAL;
else
error = ithread_schedule(it);
}
if (error == EINVAL) {
atomic_add_long(isrc->is_straycount, 1);
if (*isrc->is_straycount < MAX_STRAY_LOG)
log(LOG_ERR, "stray irq%d\n", vector);
else if (*isrc->is_straycount == MAX_STRAY_LOG)
log(LOG_CRIT,
"too many stray irq %d's: not logging anymore\n",
vector);
}
td->td_intr_nesting_level--;
}
void
intr_resume(void)
{
struct intsrc **isrc;
int i;
mtx_lock_spin(&intr_table_lock);
for (i = 0, isrc = interrupt_sources; i < NUM_IO_INTS; i++, isrc++)
if (*isrc != NULL && (*isrc)->is_pic->pic_resume != NULL)
(*isrc)->is_pic->pic_resume(*isrc);
mtx_unlock_spin(&intr_table_lock);
}
void
intr_suspend(void)
{
struct intsrc **isrc;
int i;
mtx_lock_spin(&intr_table_lock);
for (i = 0, isrc = interrupt_sources; i < NUM_IO_INTS; i++, isrc++)
if (*isrc != NULL && (*isrc)->is_pic->pic_suspend != NULL)
(*isrc)->is_pic->pic_suspend(*isrc);
mtx_unlock_spin(&intr_table_lock);
}
static void
intrcnt_setname(const char *name, int index)
{
snprintf(intrnames + (MAXCOMLEN + 1) * index, MAXCOMLEN + 1, "%-*s",
MAXCOMLEN, name);
}
static void
intrcnt_updatename(struct intsrc *is)
{
intrcnt_setname(is->is_ithread->it_td->td_proc->p_comm, is->is_index);
}
static void
intrcnt_register(struct intsrc *is)
{
char straystr[MAXCOMLEN + 1];
/* mtx_assert(&intr_table_lock, MA_OWNED); */
KASSERT(is->is_ithread != NULL, ("%s: isrc with no ithread", __func__));
is->is_index = intrcnt_index;
intrcnt_index += 2;
snprintf(straystr, MAXCOMLEN + 1, "stray irq%d",
is->is_pic->pic_vector(is));
intrcnt_updatename(is);
is->is_count = &intrcnt[is->is_index];
intrcnt_setname(straystr, is->is_index + 1);
is->is_straycount = &intrcnt[is->is_index + 1];
}
static void
intr_init(void *dummy __unused)
{
intrcnt_setname("???", 0);
intrcnt_index = 1;
mtx_init(&intr_table_lock, "intr table", NULL, MTX_SPIN);
}
SYSINIT(intr_init, SI_SUB_INTR, SI_ORDER_FIRST, intr_init, NULL)
#ifdef DDB
/*
* Dump data about interrupt handlers
*/
DB_SHOW_COMMAND(irqs, db_show_irqs)
{
struct intsrc **isrc;
int i, quit, verbose;
quit = 0;
if (strcmp(modif, "v") == 0)
verbose = 1;
else
verbose = 0;
isrc = interrupt_sources;
db_setup_paging(db_simple_pager, &quit, DB_LINES_PER_PAGE);
for (i = 0; i < NUM_IO_INTS && !quit; i++, isrc++)
if (*isrc != NULL)
db_dump_ithread((*isrc)->is_ithread, verbose);
}
#endif