sgi-xpc: implement opencomplete messaging
sgi-xpc has a window of failure where an open message can be sent and a
subsequent data message can get lost. We have added a new message
(opencomplete) which closes that window.
Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
index 97f7cb2..1e475b4 100644
--- a/drivers/misc/sgi-xp/xpc_uv.c
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -534,6 +534,17 @@
xpc_wakeup_channel_mgr(part);
break;
}
+ case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
+ struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
+
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+ xpc_wakeup_channel_mgr(part);
+ }
case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
part_uv->flags |= XPC_P_ENGAGED_UV;
@@ -1202,6 +1213,16 @@
}
static void
+xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
+
+ msg.ch_number = ch->number;
+ xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
+}
+
+static void
xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
{
unsigned long irq_flags;
@@ -1665,6 +1686,7 @@
xpc_send_chctl_closereply = xpc_send_chctl_closereply_uv;
xpc_send_chctl_openrequest = xpc_send_chctl_openrequest_uv;
xpc_send_chctl_openreply = xpc_send_chctl_openreply_uv;
+ xpc_send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv;
xpc_save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv;