The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/intr_machdep.c

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    1 /*-
    2  * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    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.
   16  *
   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
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD$
   30  */
   31 
   32 /*
   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
   37  * that source.
   38  */
   39 
   40 #include "opt_ddb.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/bus.h>
   44 #include <sys/interrupt.h>
   45 #include <sys/lock.h>
   46 #include <sys/ktr.h>
   47 #include <sys/kernel.h>
   48 #include <sys/mutex.h>
   49 #include <sys/proc.h>
   50 #include <sys/syslog.h>
   51 #include <sys/systm.h>
   52 #include <machine/clock.h>
   53 #include <machine/intr_machdep.h>
   54 #ifdef DDB
   55 #include <ddb/ddb.h>
   56 #endif
   57 
   58 #define MAX_STRAY_LOG   5
   59 
   60 typedef void (*mask_fn)(uintptr_t vector);
   61 
   62 static int intrcnt_index;
   63 static struct intsrc *interrupt_sources[NUM_IO_INTS];
   64 static struct mtx intr_table_lock;
   65 
   66 static void     intr_init(void *__dummy);
   67 static void     intrcnt_setname(const char *name, int index);
   68 static void     intrcnt_updatename(struct intsrc *is);
   69 static void     intrcnt_register(struct intsrc *is);
   70 
   71 /*
   72  * Register a new interrupt source with the global interrupt system.
   73  * The global interrupts need to be disabled when this function is
   74  * called.
   75  */
   76 int
   77 intr_register_source(struct intsrc *isrc)
   78 {
   79         int error, vector;
   80 
   81         vector = isrc->is_pic->pic_vector(isrc);
   82         if (interrupt_sources[vector] != NULL)
   83                 return (EEXIST);
   84         error = ithread_create(&isrc->is_ithread, (uintptr_t)isrc, 0,
   85             (mask_fn)isrc->is_pic->pic_disable_source,
   86             (mask_fn)isrc->is_pic->pic_enable_source, "irq%d:", vector);
   87         if (error)
   88                 return (error);
   89         mtx_lock_spin(&intr_table_lock);
   90         if (interrupt_sources[vector] != NULL) {
   91                 mtx_unlock_spin(&intr_table_lock);
   92                 ithread_destroy(isrc->is_ithread);
   93                 return (EEXIST);
   94         }
   95         intrcnt_register(isrc);
   96         interrupt_sources[vector] = isrc;
   97         mtx_unlock_spin(&intr_table_lock);
   98         return (0);
   99 }
  100 
  101 struct intsrc *
  102 intr_lookup_source(int vector)
  103 {
  104 
  105         return (interrupt_sources[vector]);
  106 }
  107 
  108 int
  109 intr_add_handler(const char *name, int vector, driver_intr_t handler,
  110     void *arg, enum intr_type flags, void **cookiep)
  111 {
  112         struct intsrc *isrc;
  113         int error;
  114 
  115         isrc = intr_lookup_source(vector);
  116         if (isrc == NULL)
  117                 return (EINVAL);
  118         error = ithread_add_handler(isrc->is_ithread, name, handler, arg,
  119             ithread_priority(flags), flags, cookiep);
  120         if (error == 0) {
  121                 intrcnt_updatename(isrc);
  122                 isrc->is_pic->pic_enable_intr(isrc);
  123                 isrc->is_pic->pic_enable_source(isrc);
  124         }
  125         return (error);
  126 }
  127 
  128 int
  129 intr_remove_handler(void *cookie)
  130 {
  131         int error;
  132 
  133         error = ithread_remove_handler(cookie);
  134 #ifdef XXX
  135         if (error == 0)
  136                 intrcnt_updatename(/* XXX */);
  137 #endif
  138         return (error);
  139 }
  140 
  141 int
  142 intr_config_intr(int vector, enum intr_trigger trig, enum intr_polarity pol)
  143 {
  144         struct intsrc *isrc;
  145 
  146         isrc = intr_lookup_source(vector);
  147         if (isrc == NULL)
  148                 return (EINVAL);
  149         return (isrc->is_pic->pic_config_intr(isrc, trig, pol));
  150 }
  151 
  152 void
  153 intr_execute_handlers(struct intsrc *isrc, struct intrframe *iframe)
  154 {
  155         struct thread *td;
  156         struct ithd *it;
  157         struct intrhand *ih;
  158         int error, vector;
  159 
  160         td = curthread;
  161         td->td_intr_nesting_level++;
  162 
  163         /*
  164          * We count software interrupts when we process them.  The
  165          * code here follows previous practice, but there's an
  166          * argument for counting hardware interrupts when they're
  167          * processed too.
  168          */
  169         (*isrc->is_count)++;
  170         cnt.v_intr++;
  171 
  172         it = isrc->is_ithread;
  173         if (it == NULL)
  174                 ih = NULL;
  175         else
  176                 ih = TAILQ_FIRST(&it->it_handlers);
  177 
  178         /*
  179          * XXX: We assume that IRQ 0 is only used for the ISA timer
  180          * device (clk).
  181          */
  182         vector = isrc->is_pic->pic_vector(isrc);
  183         if (vector == 0)
  184                 clkintr_pending = 1;
  185 
  186         if (ih != NULL && ih->ih_flags & IH_FAST) {
  187                 /*
  188                  * Execute fast interrupt handlers directly.
  189                  * To support clock handlers, if a handler registers
  190                  * with a NULL argument, then we pass it a pointer to
  191                  * a trapframe as its argument.
  192                  */
  193                 critical_enter();
  194                 TAILQ_FOREACH(ih, &it->it_handlers, ih_next) {
  195                         MPASS(ih->ih_flags & IH_FAST);
  196                         CTR3(KTR_INTR, "%s: executing handler %p(%p)",
  197                             __func__, ih->ih_handler,
  198                             ih->ih_argument == NULL ? iframe :
  199                             ih->ih_argument);
  200                         if (ih->ih_argument == NULL)
  201                                 ih->ih_handler(iframe);
  202                         else
  203                                 ih->ih_handler(ih->ih_argument);
  204                 }
  205                 isrc->is_pic->pic_eoi_source(isrc);
  206                 error = 0;
  207                 /* XXX */
  208                 td->td_pflags &= ~TDP_OWEPREEMPT;
  209                 critical_exit();
  210         } else {
  211                 /*
  212                  * For stray and threaded interrupts, we mask and EOI the
  213                  * source.
  214                  */
  215                 isrc->is_pic->pic_disable_source(isrc, PIC_EOI);
  216                 if (ih == NULL)
  217                         error = EINVAL;
  218                 else
  219                         error = ithread_schedule(it);
  220         }
  221         if (error == EINVAL) {
  222                 (*isrc->is_straycount)++;
  223                 if (*isrc->is_straycount < MAX_STRAY_LOG)
  224                         log(LOG_ERR, "stray irq%d\n", vector);
  225                 else if (*isrc->is_straycount == MAX_STRAY_LOG)
  226                         log(LOG_CRIT,
  227                             "too many stray irq %d's: not logging anymore\n",
  228                             vector);
  229         }
  230         td->td_intr_nesting_level--;
  231 }
  232 
  233 void
  234 intr_resume(void)
  235 {
  236         struct intsrc **isrc;
  237         int i;
  238 
  239         mtx_lock_spin(&intr_table_lock);
  240         for (i = 0, isrc = interrupt_sources; i < NUM_IO_INTS; i++, isrc++)
  241                 if (*isrc != NULL && (*isrc)->is_pic->pic_resume != NULL)
  242                         (*isrc)->is_pic->pic_resume(*isrc);
  243         mtx_unlock_spin(&intr_table_lock);
  244 }
  245 
  246 void
  247 intr_suspend(void)
  248 {
  249         struct intsrc **isrc;
  250         int i;
  251 
  252         mtx_lock_spin(&intr_table_lock);
  253         for (i = 0, isrc = interrupt_sources; i < NUM_IO_INTS; i++, isrc++)
  254                 if (*isrc != NULL && (*isrc)->is_pic->pic_suspend != NULL)
  255                         (*isrc)->is_pic->pic_suspend(*isrc);
  256         mtx_unlock_spin(&intr_table_lock);
  257 }
  258 
  259 static void
  260 intrcnt_setname(const char *name, int index)
  261 {
  262 
  263         snprintf(intrnames + (MAXCOMLEN + 1) * index, MAXCOMLEN + 1, "%-*s",
  264             MAXCOMLEN, name);
  265 }
  266 
  267 static void
  268 intrcnt_updatename(struct intsrc *is)
  269 {
  270 
  271         intrcnt_setname(is->is_ithread->it_td->td_proc->p_comm, is->is_index);
  272 }
  273 
  274 static void
  275 intrcnt_register(struct intsrc *is)
  276 {
  277         char straystr[MAXCOMLEN + 1];
  278 
  279         /* mtx_assert(&intr_table_lock, MA_OWNED); */
  280         KASSERT(is->is_ithread != NULL, ("%s: isrc with no ithread", __func__));
  281         is->is_index = intrcnt_index;
  282         intrcnt_index += 2;
  283         snprintf(straystr, MAXCOMLEN + 1, "stray irq%d",
  284             is->is_pic->pic_vector(is));
  285         intrcnt_updatename(is);
  286         is->is_count = &intrcnt[is->is_index];
  287         intrcnt_setname(straystr, is->is_index + 1);
  288         is->is_straycount = &intrcnt[is->is_index + 1];
  289 }
  290 
  291 static void
  292 intr_init(void *dummy __unused)
  293 {
  294 
  295         intrcnt_setname("???", 0);
  296         intrcnt_index = 1;
  297         mtx_init(&intr_table_lock, "intr table", NULL, MTX_SPIN);
  298 }
  299 SYSINIT(intr_init, SI_SUB_INTR, SI_ORDER_FIRST, intr_init, NULL)
  300 
  301 #ifdef DDB
  302 /*
  303  * Dump data about interrupt handlers
  304  */
  305 DB_SHOW_COMMAND(irqs, db_show_irqs)
  306 {
  307         struct intsrc **isrc;
  308         int i, quit, verbose;
  309 
  310         quit = 0;
  311         if (strcmp(modif, "v") == 0)
  312                 verbose = 1;
  313         else
  314                 verbose = 0;
  315         isrc = interrupt_sources;
  316         db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
  317         for (i = 0; i < NUM_IO_INTS && !quit; i++, isrc++)
  318                 if (*isrc != NULL)
  319                         db_dump_ithread((*isrc)->is_ithread, verbose);
  320 }
  321 #endif

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