Make suspend -> eject card -> resume work.

On suspend, the apm code calls each function in its powerhook list. This list
contains pointers to functions that are to be executed on PWR_SUSPEND and
PWR_RESUME. One of these functions is pcmcia_power() which calls xxx_activate()
for each PC Card that is connected with the action DVACT_ACTIVATE (where xxx
is the name of the driver for the PC Card). On resume, the same thing happens,
except the action is DVACT_ACTIVATE.

Clearly, if a card is gone when we resume, trying to activate it is a bad idea.
This commit adds a pcic_power() function that runs before pcmcia_power(). On
resume, it uses pcic_intr_socket() to detect any events that occurred while we
were suspended. (I had to split pcic_event_thread() into a threaded part and
a non-threaded part, since the thread will not run when we are in interrupt
context, but I need the events to be processed before pcmcia_power() runs.) So,
by the time pcic_power() is through, all events that occurred during suspend
have been processed, and pcmcia_power() will not try to activate cards that are
not there since they have already been completely and properly detached.

Note that event handling for card removals first calls the deactivate functions
on the card then the detach functions. When we suspend, apm does the deactivate
for us. So on resume, if we detect a card has been removed, we skip the
deactivation step and just detach. We use the DVF_ACTIVE bit to determine
whether or not deactivation has already occurred. Deactivating a device that
has already been deactivated causes a panic.

1 files changed, 107 insertions, 72 deletions

diff --git a/sys/dev/ic/i82365.c b/sys/dev/ic/i82365.c
index 92546233e4d..3e5cb36f5c5 100644
--- a/sys/dev/ic/i82365.c
+++ b/sys/dev/ic/i82365.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: i82365.c,v 1.14 2000/06/23 16:53:07 aaron Exp $	*/
+/*	$OpenBSD: i82365.c,v 1.15 2000/06/28 17:48:10 aaron Exp $	*/
 /*	$NetBSD: i82365.c,v 1.10 1998/06/09 07:36:55 thorpej Exp $	*/
 
 /*
@@ -99,7 +99,7 @@ void	pcic_chip_do_io_map __P((struct pcic_handle *, int));
 
 void	pcic_create_event_thread __P((void *));
 void	pcic_event_thread __P((void *));
-
+void	pcic_event_process __P((struct pcic_handle *, struct pcic_event *));
 void	pcic_queue_event __P((struct pcic_handle *, int));
 
 void	pcic_wait_ready __P((struct pcic_handle *));
@@ -434,78 +434,81 @@ pcic_event_thread(arg)
 			(void) tsleep((caddr_t)pcic_event_thread, PWAIT,
 			    "pcicss", hz/4);
 		}
+		pcic_event_process(h, pe);
+	}
+
+	h->event_thread = NULL;
+
+	/* In case parent is waiting for us to exit. */
+	wakeup(sc);
+
+	kthread_exit(0);
+}
+
+void
+pcic_event_process(h, pe)
+	struct pcic_handle *h;
+	struct pcic_event *pe;
+{
+	int s;
+
+	s = splhigh();
+	SIMPLEQ_REMOVE_HEAD(&h->events, pe, pe_q);
+	splx(s);
+
+	switch (pe->pe_type) {
+	case PCIC_EVENT_INSERTION:
 		s = splhigh();
-		SIMPLEQ_REMOVE_HEAD(&h->events, pe, pe_q);
-		splx(s);
+		while (1) {
+			struct pcic_event *pe1, *pe2;
 
-		switch (pe->pe_type) {
-		case PCIC_EVENT_INSERTION:
-			s = splhigh();
-			while (1) {
-				struct pcic_event *pe1, *pe2;
-
-				if ((pe1 = SIMPLEQ_FIRST(&h->events)) == NULL)
-					break;
-				if (pe1->pe_type != PCIC_EVENT_REMOVAL)
-					break;
-				if ((pe2 = SIMPLEQ_NEXT(pe1, pe_q)) == NULL)
-					break;
-				if (pe2->pe_type == PCIC_EVENT_INSERTION) {
-					SIMPLEQ_REMOVE_HEAD(&h->events, pe1,
-					    pe_q);
-					free(pe1, M_TEMP);
-					SIMPLEQ_REMOVE_HEAD(&h->events, pe2,
-					    pe_q);
-					free(pe2, M_TEMP);
-				}
+			if ((pe1 = SIMPLEQ_FIRST(&h->events)) == NULL)
+				break;
+			if (pe1->pe_type != PCIC_EVENT_REMOVAL)
+				break;
+			if ((pe2 = SIMPLEQ_NEXT(pe1, pe_q)) == NULL)
+				break;
+			if (pe2->pe_type == PCIC_EVENT_INSERTION) {
+				SIMPLEQ_REMOVE_HEAD(&h->events, pe1, pe_q);
+				free(pe1, M_TEMP);
+				SIMPLEQ_REMOVE_HEAD(&h->events, pe2, pe_q);
+				free(pe2, M_TEMP);
 			}
-			splx(s);
+		}
+		splx(s);
 				
-			DPRINTF(("%s: insertion event\n",
-			    h->ph_parent->dv_xname));
-			pcic_attach_card(h);
-			break;
-
-		case PCIC_EVENT_REMOVAL:
-			s = splhigh();
-			while (1) {
-				struct pcic_event *pe1, *pe2;
-
-				if ((pe1 = SIMPLEQ_FIRST(&h->events)) == NULL)
-					break;
-				if (pe1->pe_type != PCIC_EVENT_INSERTION)
-					break;
-				if ((pe2 = SIMPLEQ_NEXT(pe1, pe_q)) == NULL)
-					break;
-				if (pe2->pe_type == PCIC_EVENT_REMOVAL) {
-					SIMPLEQ_REMOVE_HEAD(&h->events, pe1,
-					    pe_q);
-					free(pe1, M_TEMP);
-					SIMPLEQ_REMOVE_HEAD(&h->events, pe2,
-					    pe_q);
-					free(pe2, M_TEMP);
-				}
-			}
-			splx(s);
+		DPRINTF(("%s: insertion event\n", h->ph_parent->dv_xname));
+		pcic_attach_card(h);
+		break;
 
-			DPRINTF(("%s: removal event\n",
-			    h->ph_parent->dv_xname));
-			pcic_detach_card(h, DETACH_FORCE);
-			break;
+	case PCIC_EVENT_REMOVAL:
+		s = splhigh();
+		while (1) {
+			struct pcic_event *pe1, *pe2;
 
-		default:
-			panic("pcic_event_thread: unknown event %d",
-			    pe->pe_type);
+			if ((pe1 = SIMPLEQ_FIRST(&h->events)) == NULL)
+				break;
+			if (pe1->pe_type != PCIC_EVENT_INSERTION)
+				break;
+			if ((pe2 = SIMPLEQ_NEXT(pe1, pe_q)) == NULL)
+				break;
+			if (pe2->pe_type == PCIC_EVENT_REMOVAL) {
+				SIMPLEQ_REMOVE_HEAD(&h->events, pe1, pe_q);
+				free(pe1, M_TEMP);
+				SIMPLEQ_REMOVE_HEAD(&h->events, pe2, pe_q);
+				free(pe2, M_TEMP);
+			}
 		}
-		free(pe, M_TEMP);
-	}
-
-	h->event_thread = NULL;
+		splx(s);
 
-	/* In case parent is waiting for us to exit. */
-	wakeup(sc);
+		DPRINTF(("%s: removal event\n", h->ph_parent->dv_xname));
+		pcic_detach_card(h, DETACH_FORCE);
+		break;
 
-	kthread_exit(0);
+	default:
+		panic("pcic_event_thread: unknown event %d", pe->pe_type);
+	}
+	free(pe, M_TEMP);
 }
 
 void
@@ -669,16 +672,13 @@ pcic_poll_intr(arg)
 	void *arg;
 {
 	struct pcic_softc *sc = arg;
-	int i, s;
-
-	s = spltty();
+	int i;
 
 	for (i = 0; i < PCIC_NSLOTS; i++)
 		if (sc->handle[i].flags & PCIC_FLAG_SOCKETP)
 			pcic_intr_socket(&sc->handle[i]);
 
-	timeout_add(&sc->poll_timeout, hz / 2 );
-	splx(s);
+	timeout_add(&sc->poll_timeout, hz / 2);
 }
 
 int
@@ -797,9 +797,15 @@ void
 pcic_deactivate_card(h)
 	struct pcic_handle *h;
 {
+	struct device *dev = (struct device *)h->pcmcia;
 
-	/* call the MI deactivate function */
-	pcmcia_card_deactivate(h->pcmcia);
+	/*
+	 * At suspend, apm deactivates any connected cards. If we've woken up
+	 * to find a previously-connected device missing, and we're detaching
+	 * it, we don't want to deactivate it again.
+	 */
+	if (dev->dv_flags & DVF_ACTIVE)
+		pcmcia_card_deactivate(h->pcmcia);
 
 	/* power down the socket */
 	pcic_write(h, PCIC_PWRCTL, 0);
@@ -808,6 +814,35 @@ pcic_deactivate_card(h)
 	pcic_write(h, PCIC_INTR, 0);
 }
 
+/*
+ * The pcic_power() function must execute BEFORE the pcmcia_power() hooks.
+ * During suspend, a card may have been ejected. If so, we must detach it
+ * completely before pcmcia_power() tries to activate it. Attempting to
+ * activate a card that isn't there is bad news.
+ */
+void
+pcic_power(why, arg)
+	int why;
+	void *arg;
+{
+	struct pcic_handle *h = (struct pcic_handle *)arg;
+	struct pcic_softc *sc = (struct pcic_softc *)h->ph_parent;
+	struct pcic_event *pe;
+
+	if (why != PWR_RESUME) {
+		if (timeout_pending(&sc->poll_timeout))
+			timeout_del(&sc->poll_timeout);
+	}
+	else {
+		pcic_intr_socket(h);
+
+		while ((pe = SIMPLEQ_FIRST(&h->events)))
+			pcic_event_process(h, pe);
+
+		timeout_add(&sc->poll_timeout, hz / 2);
+	}
+}
+
 int 
 pcic_chip_mem_alloc(pch, size, pcmhp)
 	pcmcia_chipset_handle_t pch;