drm/nve0/fifo: attempt to recover from engine ctxsw timeouts

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c b/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
index 072998b19984cc0ed136a4c10f974eab1e49844c..e68368a37b8b0d6d9e66fe74464e8db7163fc8ba 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
@@ -416,6 +416,14 @@ nve0_fifo_engidx(struct nve0_fifo_priv *priv, u32 engn)
        return engn;
 }
 
+static inline struct nouveau_engine *
+nve0_fifo_engine(struct nve0_fifo_priv *priv, u32 engn)
+{
+       if (engn >= ARRAY_SIZE(fifo_engine))
+               return NULL;
+       return nouveau_engine(priv, fifo_engine[engn].subdev);
+}
+
 static void
 nve0_fifo_recover_work(struct work_struct *work)
 {
@@ -498,6 +506,34 @@ nve0_fifo_sched_reason[] = {
        {}
 };
 
+static void
+nve0_fifo_intr_sched_ctxsw(struct nve0_fifo_priv *priv)
+{
+       struct nouveau_engine *engine;
+       struct nve0_fifo_chan *chan;
+       u32 engn;
+
+       for (engn = 0; engn < ARRAY_SIZE(fifo_engine); engn++) {
+               u32 stat = nv_rd32(priv, 0x002640 + (engn * 0x04));
+               u32 busy = (stat & 0x80000000);
+               u32 next = (stat & 0x07ff0000) >> 16;
+               u32 chsw = (stat & 0x00008000);
+               u32 save = (stat & 0x00004000);
+               u32 load = (stat & 0x00002000);
+               u32 prev = (stat & 0x000007ff);
+               u32 chid = load ? next : prev;
+               (void)save;
+
+               if (busy && chsw) {
+                       if (!(chan = (void *)priv->base.channel[chid]))
+                               continue;
+                       if (!(engine = nve0_fifo_engine(priv, engn)))
+                               continue;
+                       nve0_fifo_recover(priv, engine, chan);
+               }
+       }
+}
+
 static void
 nve0_fifo_intr_sched(struct nve0_fifo_priv *priv)
 {
@@ -511,6 +547,14 @@ nve0_fifo_intr_sched(struct nve0_fifo_priv *priv)
                snprintf(enunk, sizeof(enunk), "UNK%02x", code);
 
        nv_error(priv, "SCHED_ERROR [ %s ]\n", en ? en->name : enunk);
+
+       switch (code) {
+       case 0x0a:
+               nve0_fifo_intr_sched_ctxsw(priv);
+               break;
+       default:
+               break;
+       }
 }
 
 static void