drm/nouveau/sw: trap and clear PMC_INTR_0_SOFTWARE

Came in useful for debugging another issue earlier, so keep it around.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/engine/software/nv04.c

@@ -110,6 +110,12 @@ nv04_software_cclass = {
  * software engine/subdev functions
  ******************************************************************************/
 
+void
+nv04_software_intr(struct nouveau_subdev *subdev)
+{
+	nv_mask(subdev, 0x000100, 0x80000000, 0x00000000);
+}
+
 static int
 nv04_software_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	      struct nouveau_oclass *oclass, void *data, u32 size,
@@ -125,6 +131,7 @@ nv04_software_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 
 	nv_engine(priv)->cclass = &nv04_software_cclass;
 	nv_engine(priv)->sclass = nv04_software_sclass;
+	nv_subdev(priv)->intr = nv04_software_intr;
 	return 0;
 }
 

drivers/gpu/drm/nouveau/core/engine/software/nv10.c

@@ -113,6 +113,7 @@ nv10_software_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 
 	nv_engine(priv)->cclass = &nv10_software_cclass;
 	nv_engine(priv)->sclass = nv10_software_sclass;
+	nv_subdev(priv)->intr = nv04_software_intr;
 	return 0;
 }
 

drivers/gpu/drm/nouveau/core/engine/software/nv50.c

@@ -183,6 +183,7 @@ nv50_software_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 
 	nv_engine(priv)->cclass = &nv50_software_cclass;
 	nv_engine(priv)->sclass = nv50_software_sclass;
+	nv_subdev(priv)->intr = nv04_software_intr;
 	return 0;
 }
 

drivers/gpu/drm/nouveau/core/engine/software/nvc0.c

@@ -165,6 +165,7 @@ nvc0_software_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 
 	nv_engine(priv)->cclass = &nvc0_software_cclass;
 	nv_engine(priv)->sclass = nvc0_software_sclass;
+	nv_subdev(priv)->intr = nv04_software_intr;
 	return 0;
 }
 

drivers/gpu/drm/nouveau/core/include/engine/software.h

@@ -55,4 +55,6 @@ extern struct nouveau_oclass nv10_software_oclass;
 extern struct nouveau_oclass nv50_software_oclass;
 extern struct nouveau_oclass nvc0_software_oclass;
 
+void nv04_software_intr(struct nouveau_subdev *);
+
 #endif