Revert "drm/nouveau: inform userspace of new kernel subchannel requirements"

This reverts commit a81f15499887d3f9f24ec70bb9b7e778942a6b7b.

Gah, we have a released userspace component using fixed subc assignment
that conflicts with this.  To avoid breaking ABI this needs to be
reverted.

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

2 files changed, 13 insertions, 6 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_channel.c b/drivers/gpu/drm/nouveau/nouveau_channel.c
index 44e6416d4a33..337e228629ed 100644
--- a/drivers/gpu/drm/nouveau/nouveau_channel.c
+++ b/drivers/gpu/drm/nouveau/nouveau_channel.c
@@ -436,11 +436,18 @@ nouveau_ioctl_fifo_alloc(struct drm_device *dev, void *data,
         }
 
         if (dev_priv->card_type < NV_C0) {
-                init->subchan[0].handle = NvSw;
-                init->subchan[0].grclass = NV_SW;
-                init->nr_subchan = 1;
+                init->subchan[0].handle = NvM2MF;
+                if (dev_priv->card_type < NV_50)
+                        init->subchan[0].grclass = 0x0039;
+                else
+                        init->subchan[0].grclass = 0x5039;
+                init->subchan[1].handle = NvSw;
+                init->subchan[1].grclass = NV_SW;
+                init->nr_subchan = 2;
         } else {
-                init->nr_subchan = 0;
+                init->subchan[0].handle  = 0x9039;
+                init->subchan[0].grclass = 0x9039;
+                init->nr_subchan = 1;
         }
 
         /* Named memory object area */
diff --git a/drivers/gpu/drm/nouveau/nouveau_dma.h b/drivers/gpu/drm/nouveau/nouveau_dma.h
index bcf0fd9e313e..23d4edf992b7 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dma.h
+++ b/drivers/gpu/drm/nouveau/nouveau_dma.h
@@ -48,8 +48,8 @@ void nv50_dma_push(struct nouveau_channel *, struct nouveau_bo *,
 
 /* Hardcoded object assignments to subchannels (subchannel id). */
 enum {
-        NvSubSw         = 0,
-        NvSubM2MF       = 1,
+        NvSubM2MF       = 0,
+        NvSubSw         = 1,
         NvSub2D         = 2,
         NvSubCtxSurf2D  = 2,
         NvSubGdiRect    = 3,