Kicking channels is part of their deactivation process. Maxwell chips are particularly sensitive to this, and can start fetching the previous pushbuffer of a recycled channel if this is not done.
While we are at it, improve the channel preemption code to only wait for bit 20 of 0x002634 to turn to 0, as it is the bit indicating a preempt is pending. Signed-off-by: Alexandre Courbot <[email protected]> --- drm/nouveau/nvkm/engine/fifo/gk104.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-) diff --git a/drm/nouveau/nvkm/engine/fifo/gk104.c b/drm/nouveau/nvkm/engine/fifo/gk104.c index e10f9644140f..37a7cbe6b5ec 100644 --- a/drm/nouveau/nvkm/engine/fifo/gk104.c +++ b/drm/nouveau/nvkm/engine/fifo/gk104.c @@ -166,14 +166,30 @@ gk104_fifo_context_attach(struct nvkm_object *parent, } static int +gk104_fifo_chan_kick(struct gk104_fifo_chan *chan) +{ + struct nvkm_object *obj = (void *)chan; + struct gk104_fifo_priv *priv = (void *)obj->engine; + + nv_wr32(priv, 0x002634, chan->base.chid); + if (!nv_wait(priv, 0x002634, 0x100000, 0x000000)) { + nv_error(priv, "channel %d [%s] kick timeout\n", + chan->base.chid, nvkm_client_name(chan)); + return -EBUSY; + } + + return 0; +} + +static int gk104_fifo_context_detach(struct nvkm_object *parent, bool suspend, struct nvkm_object *object) { struct nvkm_bar *bar = nvkm_bar(parent); - struct gk104_fifo_priv *priv = (void *)parent->engine; struct gk104_fifo_base *base = (void *)parent->parent; struct gk104_fifo_chan *chan = (void *)parent; u32 addr; + int err; switch (nv_engidx(object->engine)) { case NVDEV_ENGINE_SW : return 0; @@ -188,13 +204,9 @@ gk104_fifo_context_detach(struct nvkm_object *parent, bool suspend, return -EINVAL; } - nv_wr32(priv, 0x002634, chan->base.chid); - if (!nv_wait(priv, 0x002634, 0xffffffff, chan->base.chid)) { - nv_error(priv, "channel %d [%s] kick timeout\n", - chan->base.chid, nvkm_client_name(chan)); - if (suspend) - return -EBUSY; - } + err = gk104_fifo_chan_kick(chan); + if (err && suspend) + return err; if (addr) { nv_wo32(base, addr + 0x00, 0x00000000); @@ -319,6 +331,7 @@ gk104_fifo_chan_fini(struct nvkm_object *object, bool suspend) gk104_fifo_runlist_update(priv, chan->engine); } + gk104_fifo_chan_kick(chan); nv_wr32(priv, 0x800000 + (chid * 8), 0x00000000); return nvkm_fifo_channel_fini(&chan->base, suspend); } -- 2.4.2 _______________________________________________ Nouveau mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/nouveau
