[PATCH 0/2] drm/nouveau: fix GK107 VDPAU regressions

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

Hi,

This series fixes two independent Nouveau regressions affecting VDPAU
hardware video decoding on NVIDIA GK107 (Kepler).

Patch 1 fixes engine context mappings for the legacy MSVLD, MSPDEC and
MSPPP video engines. Since commit 8ab849d6dd4c
("drm/nouveau/fifo: add new engine context handling"), privileged engine
context mappings cause FIFO PRIV_VIOLATION faults and kill the channel
during VDPAU decoding on GK107.

Patch 2 fixes a fence/progress hang introduced by commit 55e1a5996085
("drm/nouveau/fifo/ga100-: add per-runlist nonstall intr handling").
Legacy FIFO implementations use a single global nonstall event at
index 0, while channel event registration was changed to use runl->id
unconditionally. This can leave fence completion waiting for an event
that is never signalled.


Tested on NVIDIA GK107 with a Linux 7.3-rc2 based drm-misc tree,
Mesa 25.0.7 and mpv using VDPAU_DRIVER=nouveau and vdpau-copy.

With both patches applied:

  H.264 1920x1080:        PASS
  MPEG-2 1920x1080:      PASS
  VC-1 Advanced Profile: PASS

All three tests completed using VDPAU hardware decoding. No Nouveau
faults were reported in dmesg.


Thanks,
Risto

Risto Pajula (2):
  drm/nouveau/fifo/gk104: fix legacy video engine context mappings
  drm/nouveau/fifo: use global nonstall event on legacy FIFO

 drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c | 14 ++++++++++++++
 drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c |  3 ++-
 2 files changed, 16 insertions(+), 1 deletion(-)

-- 
2.47.3