static void
xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
{
int (*n_of_deliverable_payloads) (struct xpc_channel *) =
xpc_arch_ops.n_of_deliverable_payloads;
do {
/* */
while (n_of_deliverable_payloads(ch) > 0 &&
!(ch->flags & XPC_C_DISCONNECTING)) {
xpc_deliver_payload(ch);
}
if (atomic_inc_return(&ch->kthreads_idle) >
ch->kthreads_idle_limit) {
/* */
atomic_dec(&ch->kthreads_idle);
break;
}
dev_dbg(xpc_chan, "idle kthread calling "
"wait_event_interruptible_exclusive()\n");
(void)wait_event_interruptible_exclusive(ch->idle_wq,
(n_of_deliverable_payloads(ch) > 0 ||
(ch->flags & XPC_C_DISCONNECTING)));
atomic_dec(&ch->kthreads_idle);
} while (!(ch->flags & XPC_C_DISCONNECTING));
}
static int
xpc_kthread_start(void *args)
{
short partid = XPC_UNPACK_ARG1(args);
u16 ch_number = XPC_UNPACK_ARG2(args);
struct xpc_partition *part = &xpc_partitions[partid];
struct xpc_channel *ch;
int n_needed;
unsigned long irq_flags;
int (*n_of_deliverable_payloads) (struct xpc_channel *) =
xpc_arch_ops.n_of_deliverable_payloads;
dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
partid, ch_number);
ch = &part->channels[ch_number];
if (!(ch->flags & XPC_C_DISCONNECTING)) {
/* */
spin_lock_irqsave(&ch->lock, irq_flags);
if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
ch->flags |= XPC_C_CONNECTEDCALLOUT;
spin_unlock_irqrestore(&ch->lock, irq_flags);
xpc_connected_callout(ch);
spin_lock_irqsave(&ch->lock, irq_flags);
ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
spin_unlock_irqrestore(&ch->lock, irq_flags);
/*
*/
n_needed = n_of_deliverable_payloads(ch) - 1;
if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING))
xpc_activate_kthreads(ch, n_needed);
} else {
spin_unlock_irqrestore(&ch->lock, irq_flags);
}
xpc_kthread_waitmsgs(part, ch);
}
/* */
spin_lock_irqsave(&ch->lock, irq_flags);
if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
!(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
spin_unlock_irqrestore(&ch->lock, irq_flags);
xpc_disconnect_callout(ch, xpDisconnecting);
spin_lock_irqsave(&ch->lock, irq_flags);
ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
}
spin_unlock_irqrestore(&ch->lock, irq_flags);
if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
atomic_dec_return(&part->nchannels_engaged) == 0) {
xpc_arch_ops.indicate_partition_disengaged(part);
}
xpc_msgqueue_deref(ch);
dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
partid, ch_number);
xpc_part_deref(part);
return 0;
}
static int
xpc_kthread_start(void *args)
{
short partid = XPC_UNPACK_ARG1(args);
u16 ch_number = XPC_UNPACK_ARG2(args);
struct xpc_partition *part = &xpc_partitions[partid];
struct xpc_channel *ch;
int n_needed;
unsigned long irq_flags;
int (*n_of_deliverable_payloads) (struct xpc_channel *) =
xpc_arch_ops.n_of_deliverable_payloads;
dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
partid, ch_number);
ch = &part->channels[ch_number];
if (!(ch->flags & XPC_C_DISCONNECTING)) {
/* let registerer know that connection has been established */
spin_lock_irqsave(&ch->lock, irq_flags);
if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
ch->flags |= XPC_C_CONNECTEDCALLOUT;
spin_unlock_irqrestore(&ch->lock, irq_flags);
xpc_connected_callout(ch);
spin_lock_irqsave(&ch->lock, irq_flags);
ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
spin_unlock_irqrestore(&ch->lock, irq_flags);
/*
* It is possible that while the callout was being
* made that the remote partition sent some messages.
* If that is the case, we may need to activate
* additional kthreads to help deliver them. We only
* need one less than total #of messages to deliver.
*/
n_needed = n_of_deliverable_payloads(ch) - 1;
if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING))
xpc_activate_kthreads(ch, n_needed);
} else {
spin_unlock_irqrestore(&ch->lock, irq_flags);
}
xpc_kthread_waitmsgs(part, ch);
}
/* let registerer know that connection is disconnecting */
spin_lock_irqsave(&ch->lock, irq_flags);
if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
!(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
spin_unlock_irqrestore(&ch->lock, irq_flags);
xpc_disconnect_callout(ch, xpDisconnecting);
spin_lock_irqsave(&ch->lock, irq_flags);
ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
}
spin_unlock_irqrestore(&ch->lock, irq_flags);
if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
atomic_dec_return(&part->nchannels_engaged) == 0) {
xpc_arch_ops.indicate_partition_disengaged(part);
}
xpc_msgqueue_deref(ch);
dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
partid, ch_number);
xpc_part_deref(part);
return 0;
}