vgsp: accept wrapped FB USERD latches and dedup direct channel event postsHEADmaster

1 files changed, 16 insertions, 0 deletions

diff --git a/kernel/gsp_rm_emulation.c b/kernel/gsp_rm_emulation.c
index 4420810..0cef9e7 100644
--- a/kernel/gsp_rm_emulation.c
+++ b/kernel/gsp_rm_emulation.c
@@ -903,6 +903,22 @@ static int gsp_rm_post_channel_event_common(struct nv_vgpu_device *vgpu,
 		if (!rm->events[i].valid || rm->events[i].h_src != h_src)
 			continue;
 
+		/*
+		 * r1780: the directly-associated post is the flood path. The
+		 * X channel's completion edge fires per consumed submission and
+		 * the 48/s burst cap then drops the wake-ups a blocked client is
+		 * waiting for (live: "event burst capped (48/48), dropped
+		 * total=3000", DDX "Failed to idle DMA"). A re-post within
+		 * GSPRM_EVENT_HINT_DEDUP adds no wake-up - the client re-reads
+		 * channel state on any event and the 0.5 s hint re-posts late
+		 * waiters - so apply the dedup the fallback loop already uses.
+		 */
+		if (!force &&
+		    time_before(jiffies,
+				rm->events[i].last_post +
+				GSPRM_EVENT_HINT_DEDUP))
+			continue;
+
 		gsp_rm_fill_ev_payload(rm, i, payload);
 		{
 			int rc = gsp_rm_send_flags(ctx, gsp_rm_ev_function(),