7d56154098
sleep locks. - Delay returning from ithread_remove_handler() until we are certain that the interrupt handler being removed has in fact been removed from the ithread. - XXX: There is still a problem in that nothing protects the kernel from adding a new handler while the ithread is running, though with our current architectures this is not a problem. Requested by: gibbs (2)
623 lines
16 KiB
C
623 lines
16 KiB
C
/*
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* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/rtprio.h>
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#include <sys/systm.h>
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#include <sys/interrupt.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/random.h>
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#include <sys/resourcevar.h>
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#include <sys/unistd.h>
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#include <sys/vmmeter.h>
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#include <machine/atomic.h>
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#include <machine/cpu.h>
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#include <machine/md_var.h>
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#include <machine/stdarg.h>
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#include <net/netisr.h> /* prototype for legacy_setsoftnet */
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struct int_entropy {
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struct proc *proc;
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int vector;
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};
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void *net_ih;
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void *vm_ih;
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void *softclock_ih;
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struct ithd *clk_ithd;
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struct ithd *tty_ithd;
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static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads");
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static void ithread_update(struct ithd *);
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static void ithread_loop(void *);
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static void start_softintr(void *);
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static void swi_net(void *);
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u_char
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ithread_priority(enum intr_type flags)
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{
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u_char pri;
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flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET |
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INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK);
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switch (flags) {
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case INTR_TYPE_TTY:
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pri = PI_TTYLOW;
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break;
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case INTR_TYPE_BIO:
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/*
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* XXX We need to refine this. BSD/OS distinguishes
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* between tape and disk priorities.
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*/
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pri = PI_DISK;
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break;
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case INTR_TYPE_NET:
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pri = PI_NET;
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break;
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case INTR_TYPE_CAM:
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pri = PI_DISK; /* XXX or PI_CAM? */
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break;
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case INTR_TYPE_CLK:
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pri = PI_REALTIME;
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break;
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case INTR_TYPE_MISC:
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pri = PI_DULL; /* don't care */
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break;
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default:
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/* We didn't specify an interrupt level. */
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panic("ithread_priority: no interrupt type in flags");
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}
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return pri;
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}
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/*
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* Regenerate the name (p_comm) and priority for a threaded interrupt thread.
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*/
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static void
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ithread_update(struct ithd *ithd)
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{
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struct intrhand *ih;
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struct proc *p;
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int entropy;
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mtx_assert(&ithd->it_lock, MA_OWNED);
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p = ithd->it_proc;
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if (p == NULL)
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return;
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strncpy(p->p_comm, ithd->it_name, sizeof(ithd->it_name));
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ih = TAILQ_FIRST(&ithd->it_handlers);
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if (ih == NULL) {
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p->p_pri.pri_level = PRI_MAX_ITHD;
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ithd->it_flags &= ~IT_ENTROPY;
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return;
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}
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entropy = 0;
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p->p_pri.pri_level = ih->ih_pri;
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p->p_pri.pri_native = ih->ih_pri;
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TAILQ_FOREACH(ih, &ithd->it_handlers, ih_next) {
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if (strlen(p->p_comm) + strlen(ih->ih_name) + 1 <
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sizeof(p->p_comm)) {
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strcat(p->p_comm, " ");
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strcat(p->p_comm, ih->ih_name);
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} else if (strlen(p->p_comm) + 1 == sizeof(p->p_comm)) {
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if (p->p_comm[sizeof(p->p_comm) - 2] == '+')
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p->p_comm[sizeof(p->p_comm) - 2] = '*';
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else
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p->p_comm[sizeof(p->p_comm) - 2] = '+';
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} else
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strcat(p->p_comm, "+");
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if (ih->ih_flags & IH_ENTROPY)
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entropy++;
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}
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if (entropy)
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ithd->it_flags |= IT_ENTROPY;
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else
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ithd->it_flags &= ~IT_ENTROPY;
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CTR1(KTR_INTR, __func__ ": updated %s\n", p->p_comm);
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}
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int
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ithread_create(struct ithd **ithread, int vector, int flags,
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void (*disable)(int), void (*enable)(int), const char *fmt, ...)
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{
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struct ithd *ithd;
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struct proc *p;
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int error;
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va_list ap;
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/* The only valid flag during creation is IT_SOFT. */
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if ((flags & ~IT_SOFT) != 0)
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return (EINVAL);
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ithd = malloc(sizeof(struct ithd), M_ITHREAD, M_WAITOK | M_ZERO);
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ithd->it_vector = vector;
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ithd->it_disable = disable;
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ithd->it_enable = enable;
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ithd->it_flags = flags;
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TAILQ_INIT(&ithd->it_handlers);
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mtx_init(&ithd->it_lock, "ithread", MTX_DEF);
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mtx_lock(&ithd->it_lock);
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va_start(ap, fmt);
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vsnprintf(ithd->it_name, sizeof(ithd->it_name), fmt, ap);
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va_end(ap);
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error = kthread_create(ithread_loop, ithd, &p, RFSTOPPED | RFHIGHPID,
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"%s", ithd->it_name);
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if (error) {
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mtx_destroy(&ithd->it_lock);
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free(ithd, M_ITHREAD);
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return (error);
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}
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p->p_pri.pri_class = PRI_ITHD;
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p->p_pri.pri_level = PRI_MAX_ITHD;
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p->p_stat = SWAIT;
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ithd->it_proc = p;
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p->p_ithd = ithd;
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if (ithread != NULL)
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*ithread = ithd;
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mtx_unlock(&ithd->it_lock);
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CTR1(KTR_INTR, __func__ ": created %s", ithd->it_name);
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return (0);
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}
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int
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ithread_destroy(struct ithd *ithread)
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{
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if (ithread == NULL)
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return (EINVAL);
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mtx_lock(&ithread->it_lock);
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if (!TAILQ_EMPTY(&ithread->it_handlers)) {
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mtx_unlock(&ithread->it_lock);
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return (EINVAL);
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}
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ithread->it_flags |= IT_DEAD;
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mtx_lock_spin(&sched_lock);
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if (ithread->it_proc->p_stat == SWAIT) {
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ithread->it_proc->p_stat = SRUN;
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setrunqueue(ithread->it_proc);
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}
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mtx_unlock_spin(&sched_lock);
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mtx_unlock(&ithread->it_lock);
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CTR1(KTR_INTR, __func__ ": killing %s", ithread->it_name);
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return (0);
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}
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int
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ithread_add_handler(struct ithd* ithread, const char *name,
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driver_intr_t handler, void *arg, u_char pri, enum intr_type flags,
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void **cookiep)
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{
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struct intrhand *ih, *temp_ih;
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if (ithread == NULL || name == NULL || handler == NULL)
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return (EINVAL);
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if ((flags & INTR_FAST) !=0)
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flags |= INTR_EXCL;
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ih = malloc(sizeof(struct intrhand), M_ITHREAD, M_WAITOK | M_ZERO);
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ih->ih_handler = handler;
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ih->ih_argument = arg;
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ih->ih_name = name;
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ih->ih_ithread = ithread;
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ih->ih_pri = pri;
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if (flags & INTR_FAST)
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ih->ih_flags = IH_FAST | IH_EXCLUSIVE;
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else if (flags & INTR_EXCL)
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ih->ih_flags = IH_EXCLUSIVE;
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if (flags & INTR_MPSAFE)
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ih->ih_flags |= IH_MPSAFE;
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if (flags & INTR_ENTROPY)
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ih->ih_flags |= IH_ENTROPY;
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mtx_lock(&ithread->it_lock);
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if ((flags & INTR_EXCL) !=0 && !TAILQ_EMPTY(&ithread->it_handlers))
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goto fail;
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if (!TAILQ_EMPTY(&ithread->it_handlers) &&
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(TAILQ_FIRST(&ithread->it_handlers)->ih_flags & IH_EXCLUSIVE) != 0)
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goto fail;
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TAILQ_FOREACH(temp_ih, &ithread->it_handlers, ih_next)
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if (temp_ih->ih_pri > ih->ih_pri)
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break;
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if (temp_ih == NULL)
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TAILQ_INSERT_TAIL(&ithread->it_handlers, ih, ih_next);
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else
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TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next);
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ithread_update(ithread);
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mtx_unlock(&ithread->it_lock);
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if (cookiep != NULL)
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*cookiep = ih;
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CTR2(KTR_INTR, __func__ ": added %s to %s", ih->ih_name,
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ithread->it_name);
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return (0);
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fail:
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mtx_unlock(&ithread->it_lock);
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free(ih, M_ITHREAD);
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return (EINVAL);
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}
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int
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ithread_remove_handler(void *cookie)
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{
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struct intrhand *handler = (struct intrhand *)cookie;
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struct ithd *ithread;
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#ifdef INVARIANTS
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struct intrhand *ih;
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#endif
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if (handler == NULL)
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return (EINVAL);
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ithread = handler->ih_ithread;
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KASSERT(ithread != NULL,
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("interrupt handler \"%s\" has a NULL interrupt thread",
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handler->ih_name));
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CTR2(KTR_INTR, __func__ ": removing %s from %s", handler->ih_name,
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ithread->it_name);
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mtx_lock(&ithread->it_lock);
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#ifdef INVARIANTS
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TAILQ_FOREACH(ih, &ithread->it_handlers, ih_next)
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if (ih == handler)
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goto ok;
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mtx_unlock(&ithread->it_lock);
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panic("interrupt handler \"%s\" not found in interrupt thread \"%s\"",
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ih->ih_name, ithread->it_name);
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ok:
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#endif
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/*
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* If the interrupt thread is already running, then just mark this
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* handler as being dead and let the ithread do the actual removal.
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*/
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mtx_lock_spin(&sched_lock);
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if (ithread->it_proc->p_stat != SWAIT) {
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handler->ih_flags |= IH_DEAD;
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/*
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* Ensure that the thread will process the handler list
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* again and remove this handler if it has already passed
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* it on the list.
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*/
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ithread->it_need = 1;
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} else
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TAILQ_REMOVE(&ithread->it_handlers, handler, ih_next);
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mtx_unlock_spin(&sched_lock);
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if ((handler->ih_flags & IH_DEAD) != 0)
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msleep(handler, &ithread->it_lock, PUSER, "itrmh", 0);
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ithread_update(ithread);
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mtx_unlock(&ithread->it_lock);
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free(handler, M_ITHREAD);
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return (0);
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}
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int
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ithread_schedule(struct ithd *ithread, int do_switch)
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{
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struct int_entropy entropy;
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struct proc *p;
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critical_t savecrit;
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|
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/*
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* If no ithread or no handlers, then we have a stray interrupt.
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*/
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if ((ithread == NULL) || TAILQ_EMPTY(&ithread->it_handlers))
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return (EINVAL);
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|
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/*
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* If any of the handlers for this ithread claim to be good
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* sources of entropy, then gather some.
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*/
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if (harvest.interrupt && ithread->it_flags & IT_ENTROPY) {
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entropy.vector = ithread->it_vector;
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entropy.proc = CURPROC;
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random_harvest(&entropy, sizeof(entropy), 2, 0,
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RANDOM_INTERRUPT);
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}
|
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p = ithread->it_proc;
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KASSERT(p != NULL, ("ithread %s has no process", ithread->it_name));
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CTR3(KTR_INTR, __func__ ": pid %d: (%s) need = %d", p->p_pid, p->p_comm,
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ithread->it_need);
|
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|
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/*
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* Set it_need to tell the thread to keep running if it is already
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* running. Then, grab sched_lock and see if we actually need to
|
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* put this thread on the runqueue. If so and the do_switch flag is
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* true, then switch to the ithread immediately. Otherwise, use
|
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* need_resched() to guarantee that this ithread will run before any
|
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* userland processes.
|
|
*/
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ithread->it_need = 1;
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mtx_lock_spin(&sched_lock);
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if (p->p_stat == SWAIT) {
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CTR1(KTR_INTR, __func__ ": setrunqueue %d", p->p_pid);
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p->p_stat = SRUN;
|
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setrunqueue(p);
|
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if (do_switch && curproc->p_stat == SRUN) {
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savecrit = sched_lock.mtx_savecrit;
|
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mtx_intr_enable(&sched_lock);
|
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if (curproc != PCPU_GET(idleproc))
|
|
setrunqueue(curproc);
|
|
curproc->p_stats->p_ru.ru_nvcsw++;
|
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mi_switch();
|
|
sched_lock.mtx_savecrit = savecrit;
|
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} else
|
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need_resched(curproc);
|
|
} else {
|
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CTR3(KTR_INTR, __func__ ": pid %d: it_need %d, state %d",
|
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p->p_pid, ithread->it_need, p->p_stat);
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
swi_add(struct ithd **ithdp, const char *name, driver_intr_t handler,
|
|
void *arg, int pri, enum intr_type flags, void **cookiep)
|
|
{
|
|
struct ithd *ithd;
|
|
int error;
|
|
|
|
if (flags & (INTR_FAST | INTR_ENTROPY))
|
|
return (EINVAL);
|
|
|
|
ithd = (ithdp != NULL) ? *ithdp : NULL;
|
|
|
|
if (ithd != NULL) {
|
|
if ((ithd->it_flags & IT_SOFT) == 0)
|
|
return(EINVAL);
|
|
} else {
|
|
error = ithread_create(&ithd, pri, IT_SOFT, NULL, NULL,
|
|
"swi%d:", pri);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (ithdp != NULL)
|
|
*ithdp = ithd;
|
|
}
|
|
return (ithread_add_handler(ithd, name, handler, arg,
|
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(pri * RQ_PPQ) + PI_SOFT, flags, cookiep));
|
|
}
|
|
|
|
|
|
/*
|
|
* Schedule a heavyweight software interrupt process.
|
|
*/
|
|
void
|
|
swi_sched(void *cookie, int flags)
|
|
{
|
|
struct intrhand *ih = (struct intrhand *)cookie;
|
|
struct ithd *it = ih->ih_ithread;
|
|
int error;
|
|
|
|
atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
|
|
|
|
CTR3(KTR_INTR, "swi_sched pid %d(%s) need=%d",
|
|
it->it_proc->p_pid, it->it_proc->p_comm, it->it_need);
|
|
|
|
/*
|
|
* Set ih_need for this handler so that if the ithread is already
|
|
* running it will execute this handler on the next pass. Otherwise,
|
|
* it will execute it the next time it runs.
|
|
*/
|
|
atomic_store_rel_int(&ih->ih_need, 1);
|
|
if (!(flags & SWI_DELAY)) {
|
|
error = ithread_schedule(it, !cold && flags & SWI_SWITCH);
|
|
KASSERT(error == 0, ("stray software interrupt"));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is the main code for interrupt threads.
|
|
*/
|
|
void
|
|
ithread_loop(void *arg)
|
|
{
|
|
struct ithd *ithd; /* our thread context */
|
|
struct intrhand *ih; /* and our interrupt handler chain */
|
|
struct proc *p;
|
|
|
|
p = curproc;
|
|
ithd = (struct ithd *)arg; /* point to myself */
|
|
KASSERT(ithd->it_proc == p && p->p_ithd == ithd,
|
|
(__func__ ": ithread and proc linkage out of sync"));
|
|
|
|
/*
|
|
* As long as we have interrupts outstanding, go through the
|
|
* list of handlers, giving each one a go at it.
|
|
*/
|
|
for (;;) {
|
|
/*
|
|
* If we are an orphaned thread, then just die.
|
|
*/
|
|
if (ithd->it_flags & IT_DEAD) {
|
|
CTR2(KTR_INTR, __func__ ": pid %d: (%s) exiting",
|
|
p->p_pid, p->p_comm);
|
|
p->p_ithd = NULL;
|
|
mtx_destroy(&ithd->it_lock);
|
|
mtx_lock(&Giant);
|
|
free(ithd, M_ITHREAD);
|
|
kthread_exit(0);
|
|
}
|
|
|
|
CTR3(KTR_INTR, __func__ ": pid %d: (%s) need=%d",
|
|
p->p_pid, p->p_comm, ithd->it_need);
|
|
while (ithd->it_need) {
|
|
/*
|
|
* Service interrupts. If another interrupt
|
|
* arrives while we are running, they will set
|
|
* it_need to denote that we should make
|
|
* another pass.
|
|
*/
|
|
atomic_store_rel_int(&ithd->it_need, 0);
|
|
restart:
|
|
TAILQ_FOREACH(ih, &ithd->it_handlers, ih_next) {
|
|
if (ithd->it_flags & IT_SOFT && !ih->ih_need)
|
|
continue;
|
|
atomic_store_rel_int(&ih->ih_need, 0);
|
|
CTR5(KTR_INTR,
|
|
__func__ ": pid %d ih=%p: %p(%p) flg=%x",
|
|
p->p_pid, (void *)ih,
|
|
(void *)ih->ih_handler, ih->ih_argument,
|
|
ih->ih_flags);
|
|
|
|
if ((ih->ih_flags & IH_DEAD) != 0) {
|
|
mtx_lock(&ithd->it_lock);
|
|
TAILQ_REMOVE(&ithd->it_handlers, ih,
|
|
ih_next);
|
|
wakeup(ih);
|
|
mtx_unlock(&ithd->it_lock);
|
|
goto restart;
|
|
}
|
|
if ((ih->ih_flags & IH_MPSAFE) == 0)
|
|
mtx_lock(&Giant);
|
|
ih->ih_handler(ih->ih_argument);
|
|
if ((ih->ih_flags & IH_MPSAFE) == 0)
|
|
mtx_unlock(&Giant);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Processed all our interrupts. Now get the sched
|
|
* lock. This may take a while and it_need may get
|
|
* set again, so we have to check it again.
|
|
*/
|
|
mtx_assert(&Giant, MA_NOTOWNED);
|
|
mtx_lock_spin(&sched_lock);
|
|
if (!ithd->it_need) {
|
|
/*
|
|
* Should we call this earlier in the loop above?
|
|
*/
|
|
if (ithd->it_enable != NULL)
|
|
ithd->it_enable(ithd->it_vector);
|
|
p->p_stat = SWAIT; /* we're idle */
|
|
CTR1(KTR_INTR, __func__ ": pid %d: done", p->p_pid);
|
|
mi_switch();
|
|
CTR1(KTR_INTR, __func__ ": pid %d: resumed", p->p_pid);
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Start standard software interrupt threads
|
|
*/
|
|
static void
|
|
start_softintr(void *dummy)
|
|
{
|
|
|
|
if (swi_add(NULL, "net", swi_net, NULL, SWI_NET, 0, &net_ih) ||
|
|
swi_add(&clk_ithd, "clock", softclock, NULL, SWI_CLOCK,
|
|
INTR_MPSAFE, &softclock_ih) ||
|
|
swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, 0, &vm_ih))
|
|
panic("died while creating standard software ithreads");
|
|
|
|
PROC_LOCK(clk_ithd->it_proc);
|
|
clk_ithd->it_proc->p_flag |= P_NOLOAD;
|
|
PROC_UNLOCK(clk_ithd->it_proc);
|
|
}
|
|
SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, NULL)
|
|
|
|
void
|
|
legacy_setsoftnet(void)
|
|
{
|
|
swi_sched(net_ih, SWI_NOSWITCH);
|
|
}
|
|
|
|
/*
|
|
* XXX: This should really be in the network code somewhere and installed
|
|
* via a SI_SUB_SOFINTR, SI_ORDER_MIDDLE sysinit.
|
|
*/
|
|
void (*netisrs[32]) __P((void));
|
|
u_int netisr;
|
|
|
|
int
|
|
register_netisr(num, handler)
|
|
int num;
|
|
netisr_t *handler;
|
|
{
|
|
|
|
if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
|
|
printf("register_netisr: bad isr number: %d\n", num);
|
|
return (EINVAL);
|
|
}
|
|
netisrs[num] = handler;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
unregister_netisr(num)
|
|
int num;
|
|
{
|
|
|
|
if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
|
|
printf("unregister_netisr: bad isr number: %d\n", num);
|
|
return (EINVAL);
|
|
}
|
|
netisrs[num] = NULL;
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
swi_net(void *dummy)
|
|
{
|
|
u_int bits;
|
|
int i;
|
|
|
|
bits = atomic_readandclear_int(&netisr);
|
|
while ((i = ffs(bits)) != 0) {
|
|
i--;
|
|
if (netisrs[i] != NULL)
|
|
netisrs[i]();
|
|
else
|
|
printf("swi_net: unregistered isr number: %d.\n", i);
|
|
bits &= ~(1 << i);
|
|
}
|
|
}
|