pc, pc64: implement disabling of msi interrupts

sys/src/9/pc/io.h

@@ -48,15 +48,19 @@ enum {
 typedef struct Vctl {
 	Vctl*	next;			/* handlers on this vector */
 
-	char	name[KNAMELEN];		/* of driver */
+	void	(*f)(Ureg*, void*);	/* handler to call */
+	void*	a;			/* argument to call it with */
+
 	int	isintr;			/* interrupt or fault/trap */
-	int	irq;
+
-	int	tbdf;
 	int	(*isr)(int);		/* get isr bit for this irq */
 	int	(*eoi)(int);		/* eoi */
 
-	void	(*f)(Ureg*, void*);	/* handler to call */
+	void	(*disable)(Vctl*);
-	void*	a;			/* argument to call it with */
+	int	irq;
+	int	tbdf;
+
+	char	name[KNAMELEN];		/* of driver */
 } Vctl;
 
 enum {

sys/src/9/pc/mp.c

@@ -469,6 +469,15 @@ htmsienable(Pcidev *pdev)
 	return -1;
 }
 
+static void
+msiintrdisable(Vctl *v)
+{
+	Pcidev *pci;
+
+	if((pci = pcimatchtbdf(v->tbdf)) != nil)
+		pcimsidisable(pci);
+}
+
 static int
 msiintrenable(Vctl *v)
 {
@@ -493,6 +502,7 @@ msiintrenable(Vctl *v)
 	cpu = mpintrcpu();
 	if(pcimsienable(pci, 0xFEE00000ULL | (cpu << 12), vno | (1<<14)) < 0)
 		return -1;
+	v->disable = msiintrdisable;
 	v->isr = lapicisr;
 	v->eoi = lapiceoi;
 	return vno;

sys/src/9/pc/trap.c

@@ -89,8 +89,7 @@ intrdisable(int irq, void (*f)(Ureg *, void *), void *a, int tbdf, char *name)
 		irq = 9;
 	if(arch->intrvecno == nil || (tbdf != BUSUNKNOWN && (irq == 0xff || irq == 0))){
 		/*
-		 * on APIC machine, irq is pretty meaningless
+		 * on APIC machine, irq is pretty meaningless.
-		 * and disabling a the vector is not implemented.
 		 * however, we still want to remove the matching
 		 * Vctl entry to prevent calling Vctl.f() with a
 		 * stale Vctl.a pointer.
@@ -109,6 +108,8 @@ intrdisable(int irq, void (*f)(Ureg *, void *), void *a, int tbdf, char *name)
 				break;
 		}
 		if(v != nil){
+			if(v->disable != nil)
+				(*v->disable)(v);
 			*pv = v->next;
 			xfree(v);
 

sys/src/9/pc64/trap.c

@@ -111,6 +111,8 @@ intrdisable(int irq, void (*f)(Ureg *, void *), void *a, int tbdf, char *name)
 				break;
 		}
 		if(v != nil){
+			if(v->disable != nil)
+				(*v->disable)(v);
 			*pv = v->next;
 			xfree(v);