[src/trunk]: src/sys/arch/xen/xen Go back using cpu_info_primary, all events ...

[bouyer <bouyer%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ee7c023a4829
branches:  trunk
changeset: 932460:ee7c023a4829
user:      bouyer <bouyer%NetBSD.org@localhost>
date:      Thu May 07 19:52:50 2020 +0000

description:
Go back using cpu_info_primary, all events are bound to vCPU 0 by default.
Register the event handler on cpu_info_primary.
While there. update the event counter on interrupts.
Finally this should be MP-safe.

diffstat:

 sys/arch/xen/xen/xenevt.c |  24 +++++++++++++++---------
 1 files changed, 15 insertions(+), 9 deletions(-)

diffs (64 lines):

diff -r 3145c5050820 -r ee7c023a4829 sys/arch/xen/xen/xenevt.c
--- a/sys/arch/xen/xen/xenevt.c Thu May 07 19:49:29 2020 +0000
+++ b/sys/arch/xen/xen/xenevt.c Thu May 07 19:52:50 2020 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: xenevt.c,v 1.59 2020/05/06 20:40:33 bouyer Exp $      */
+/*      $NetBSD: xenevt.c,v 1.60 2020/05/07 19:52:50 bouyer Exp $      */
 
 /*
  * Copyright (c) 2005 Manuel Bouyer.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: xenevt.c,v 1.59 2020/05/06 20:40:33 bouyer Exp $");
+__KERNEL_RCSID(0, "$NetBSD: xenevt.c,v 1.60 2020/05/07 19:52:50 bouyer Exp $");
 
 #include "opt_xen.h"
 #include <sys/param.h>
@@ -129,6 +129,7 @@
 };
 
 static struct intrhand *xenevt_ih;
+static evtchn_port_t xenevt_ev;
 
 /* event -> user device mapping */
 static struct xenevt_d *devevent[NR_EVENT_CHANNELS];
@@ -175,15 +176,17 @@
 
        /*
         * Allocate a loopback event port.
-        * This helps us massage xenevt_processevt() into the
-        * callchain at the appropriate level using only
-        * intr_establish_xname().
+        * It won't be used by itself, but will help registering IPL
+        * handlers.
         */
-       evtchn_port_t evtchn = xenevt_alloc_event();
+       xenevt_ev = xenevt_alloc_event();
 
-       /* The real objective here is to wiggle into the ih callchain for IPL level */
-       xenevt_ih = intr_establish_xname(-1, &xen_pic, evtchn, 
-           IST_LEVEL, level, xenevt_processevt, NULL, true, "xenevt");
+       /*
+        * The real objective here is to wiggle into the ih callchain for
+        * IPL level on vCPU 0. (events are bound to vCPU 0 by default).
+        */
+       xenevt_ih = event_set_handler(xenevt_ev, xenevt_processevt, NULL,
+           level, NULL, "xenevt", true, &cpu_info_primary);
 
        KASSERT(xenevt_ih != NULL);
 }
@@ -192,9 +195,12 @@
 void
 xenevt_setipending(int l1, int l2)
 {
+       KASSERT(curcpu() == xenevt_ih->ih_cpu);
+       KASSERT(xenevt_ih->ih_cpu->ci_ilevel >= IPL_HIGH);
        atomic_or_ulong(&xenevt_ev1, 1UL << l1);
        atomic_or_ulong(&xenevt_ev2[l1], 1UL << l2);
        atomic_or_32(&xenevt_ih->ih_cpu->ci_ipending, 1 << SIR_XENIPL_HIGH);
+       evtsource[xenevt_ev]->ev_evcnt.ev_count++;
 }
 
 /* process pending events */