sema-svc: wake the service thread on every injected pin

The injection queue was only drained at the top of the service loop, which
can be inside a multi-second pump/discovery pass; live runs showed the GR
counter pins landing ~1 s after the client mapped the page, i.e. after its
context-init deadline. Waking on enqueue drains the batch immediately.

1 files changed, 9 insertions, 0 deletions

diff --git a/kernel/gsp_sema_service.c b/kernel/gsp_sema_service.c
index d476188..3c732e8 100644
--- a/kernel/gsp_sema_service.c
+++ b/kernel/gsp_sema_service.c
@@ -4870,6 +4870,15 @@ int gsp_sema_service_add_map(u64 gpu_va, u64 pa, u64 len, u32 ap)
 	svc_map_add_q[svc_map_add_head % SVC_MAP_ADD_MAX].ap = ap;
 	svc_map_add_head = next;
 	spin_unlock_irqrestore(&svc_map_add_lock, flags);
+
+	/*
+	 * Drain now: the client's context-init deadline is a couple of
+	 * seconds and the service loop may be in a long pump/discovery pass,
+	 * so an injection that waits for the next loop iteration can land
+	 * after the client already gave up.
+	 */
+	if (svc.task)
+		wake_up_process(svc.task);
 	return 0;
 }