drm/nouveau: add defines for internal class names

Will probably flesh the documentation of the classes out a bit too at some
later point.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/include/core/class.h

 #ifndef __NOUVEAU_CLASS_H__
 #define __NOUVEAU_CLASS_H__
 
-/* 0080: NV_DEVICE
+/* Device class
+ *
+ * 0080: NV_DEVICE
  */
+#define NV_DEVICE_CLASS                                              0x00000080
 
 #define NV_DEVICE_DISABLE_IDENTIFY                        0x0000000000000001ULL
 #define NV_DEVICE_DISABLE_MMIO                            0x0000000000000002ULL
@@ -27,10 +30,15 @@ struct nv_device_class {
 	u64 debug0;	/* as above, but *internal* ids, and *NOT* ABI */
 };
 
-/* 0002: NV_DMA_FROM_MEMORY
+/* DMA object classes
+ *
+ * 0002: NV_DMA_FROM_MEMORY
  * 0003: NV_DMA_TO_MEMORY
  * 003d: NV_DMA_IN_MEMORY
  */
+#define NV_DMA_FROM_MEMORY_CLASS                                     0x00000002
+#define NV_DMA_TO_MEMORY_CLASS                                       0x00000003
+#define NV_DMA_IN_MEMORY_CLASS                                       0x0000003d
 
 #define NV_DMA_TARGET_MASK                                           0x000000ff
 #define NV_DMA_TARGET_VM                                             0x00000000
@@ -51,13 +59,21 @@ struct nv_dma_class {
 	u64 limit;
 };
 
-/* 006b: NV03_CHANNEL_DMA
+/* DMA FIFO channel classes
+ *
+ * 006b: NV03_CHANNEL_DMA
  * 006e: NV10_CHANNEL_DMA
  * 176e: NV17_CHANNEL_DMA
  * 406e: NV40_CHANNEL_DMA
  * 506e: NV50_CHANNEL_DMA
  * 826e: NV84_CHANNEL_DMA
  */
+#define NV03_CHANNEL_DMA_CLASS                                       0x0000006b
+#define NV10_CHANNEL_DMA_CLASS                                       0x0000006e
+#define NV17_CHANNEL_DMA_CLASS                                       0x0000176e
+#define NV40_CHANNEL_DMA_CLASS                                       0x0000406e
+#define NV50_CHANNEL_DMA_CLASS                                       0x0000506e
+#define NV84_CHANNEL_DMA_CLASS                                       0x0000826e
 
 struct nv03_channel_dma_class {
 	u32 pushbuf;
@@ -65,20 +81,25 @@ struct nv03_channel_dma_class {
 	u64 offset;
 };
 
-/* 506f: NV50_CHANNEL_IND
+/* Indirect FIFO channel classes
+ *
+ * 506f: NV50_CHANNEL_IND
  * 826f: NV84_CHANNEL_IND
  * 906f: NVC0_CHANNEL_IND
+ * a06f: NVE0_CHANNEL_IND
  */
 
+#define NV50_CHANNEL_IND_CLASS                                       0x0000506f
+#define NV84_CHANNEL_IND_CLASS                                       0x0000826f
+#define NVC0_CHANNEL_IND_CLASS                                       0x0000906f
+#define NVE0_CHANNEL_IND_CLASS                                       0x0000a06f
+
 struct nv50_channel_ind_class {
 	u32 pushbuf;
 	u32 ilength;
 	u64 ioffset;
 };
 
-/* a06f: NVE0_CHANNEL_IND
- */
-
 #define NVE0_CHANNEL_IND_ENGINE_GR                                   0x00000001
 #define NVE0_CHANNEL_IND_ENGINE_VP                                   0x00000002
 #define NVE0_CHANNEL_IND_ENGINE_PPP                                  0x00000004