[Nouveau] [PATCH 4/5] drm/nv31/mpeg: store chan singleton in engine, use it for dispatch

[Ilia Mirkin]

This makes nv31+ able to actually perform the nv_call, since previously
the inst was not available.

Signed-off-by: Ilia Mirkin <imir...@alum.mit.edu>
---
 drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.c | 27 +++++++++++++++----------
 drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.h |  9 +++++----
 2 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.c 
b/drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.c
index 2f80b223..9330fc4 100644
--- a/drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.c
+++ b/drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.c
@@ -147,6 +147,8 @@ nv31_mpeg_context_ctor(struct nouveau_object *parent,
        if (ret)
                return ret;
 
+       priv->chan = chan;
+
        return 0;
 }
 
@@ -155,8 +157,11 @@ nv31_mpeg_context_dtor(struct nouveau_object *object)
 {
        struct nv31_mpeg_priv *priv = (void *)object->engine;
        struct nv31_mpeg_chan *chan = (void *)object;
-       atomic_dec(&priv->refcount);
+
+       WARN_ON(priv->chan != chan);
+       priv->chan = NULL;
        nouveau_object_destroy(&chan->base);
+       atomic_dec(&priv->refcount);
 }
 
 struct nouveau_oclass
@@ -189,20 +194,19 @@ void
 nv31_mpeg_intr(struct nouveau_subdev *subdev)
 {
        struct nouveau_fifo *pfifo = nouveau_fifo(subdev);
-       struct nouveau_engine *engine = nv_engine(subdev);
-       struct nouveau_object *engctx;
        struct nouveau_handle *handle;
        struct nv31_mpeg_priv *priv = (void *)subdev;
-       u32 inst = nv_rd32(priv, 0x00b318) & 0x000fffff;
+       struct nouveau_object *engctx = &priv->chan->base;
        u32 stat = nv_rd32(priv, 0x00b100);
        u32 type = nv_rd32(priv, 0x00b230);
        u32 mthd = nv_rd32(priv, 0x00b234);
        u32 data = nv_rd32(priv, 0x00b238);
        u32 show = stat;
-       int chid;
+       int chid = pfifo->chid(pfifo, engctx);
 
-       engctx = nouveau_engctx_get(engine, inst);
-       chid   = pfifo->chid(pfifo, engctx);
+       if (engctx)
+               if (nouveau_object_inc(engctx))
+                       engctx = NULL;
 
        if (stat & 0x01000000) {
                /* happens on initial binding of the object */
@@ -211,7 +215,7 @@ nv31_mpeg_intr(struct nouveau_subdev *subdev)
                        show &= ~0x01000000;
                }
 
-               if (type == 0x00000010) {
+               if (type == 0x00000010 && engctx) {
                        handle = nouveau_handle_get_class(engctx, 0x3174);
                        if (handle && !nv_call(handle->object, mthd, data))
                                show &= ~0x01000000;
@@ -224,12 +228,13 @@ nv31_mpeg_intr(struct nouveau_subdev *subdev)
 
        if (show) {
                nv_error(priv,
-                        "ch %d [0x%08x %s] 0x%08x 0x%08x 0x%08x 0x%08x\n",
-                        chid, inst << 4, nouveau_client_name(engctx), stat,
+                        "ch %d [%s] 0x%08x 0x%08x 0x%08x 0x%08x\n",
+                        chid, nouveau_client_name(engctx), stat,
                         type, mthd, data);
        }
 
-       nouveau_engctx_put(engctx);
+       if (engctx)
+               WARN_ON(nouveau_object_dec(engctx, false));
 }
 
 static int
diff --git a/drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.h 
b/drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.h
index a488c13..62d04e4 100644
--- a/drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.h
+++ b/drivers/gpu/drm/nouveau/core/engine/mpeg/nv31.h
@@ -3,13 +3,14 @@
 
 #include <engine/mpeg.h>
 
+struct nv31_mpeg_chan {
+       struct nouveau_object base;
+};
+
 struct nv31_mpeg_priv {
        struct nouveau_mpeg base;
        atomic_t refcount;
-};
-
-struct nv31_mpeg_chan {
-       struct nouveau_object base;
+       struct nv31_mpeg_chan *chan;
 };
 
 #endif
-- 
1.8.1.5

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