[PATCH 2/2] drm/nouveau/fifo: use global nonstall event on legacy FIFO

[Risto Pajula <or.pajula@gmail.com>]

The per-runlist nonstall interrupt handling change made channel
nonstall event registration use the runlist ID instead of the global
event index 0.

Legacy FIFO implementations do not provide a nonstall constructor.
They have a single global nonstall event, and their interrupt handlers
signal event index 0. Registering channel events using runl->id can
therefore leave fence completion waiting for an event that is never
signalled.

Use the runlist ID when per-runlist nonstall interrupts have been
constructed, and keep using event index 0 for legacy FIFO
implementations.

Fixes: 55e1a5996085 ("drm/nouveau/fifo/ga100-: add per-runlist nonstall intr handling")
Assisted-by: LLM
Signed-off-by: Risto Pajula <or.pajula@gmail.com>
---
 drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c
index d6a87cec2..b96e84192 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c
@@ -52,7 +52,8 @@ nvkm_uchan_uevent(struct nvkm_object *object, void *argv, u32 argc, struct nvkm_
 
 	switch (args->v0.type) {
 	case NVIF_CHAN_EVENT_V0_NON_STALL_INTR:
-		return nvkm_uevent_add(uevent, &runl->fifo->nonstall.event, runl->id,
+		return nvkm_uevent_add(uevent, &runl->fifo->nonstall.event,
+				runl->fifo->func->nonstall_ctor ? runl->id : 0,
 				       NVKM_FIFO_NONSTALL_EVENT, NULL);
 	case NVIF_CHAN_EVENT_V0_KILLED:
 		return nvkm_uevent_add(uevent, &runl->chid->event, chan->id,
-- 
2.47.3