drm/nouveau/kms/nv50-: Move hard-coded object handles into header

While most of the functionality on Nvidia GPUs doesn't require using an
explicit handle instead of the main VRAM handle + offset, there are a
couple of places that do require explicit handles, such as CRC
functionality. Since this means we're about to add another
nouveau-chosen handle, let's just go ahead and move any hard-coded
handles into a single header. This is just to keep things slightly
organized, and to make it a little bit easier if we need to add more
handles in the future.

This patch should contain no functional changes.

Changes since v3:
* Correct SPDX license identifier (checkpatch)
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200627194657.156514-9-lyude@redhat.com

drivers/gpu/drm/nouveau/dispnv50/disp.c

@@ -26,6 +26,7 @@
 #include "core.h"
 #include "head.h"
 #include "wndw.h"
+#include "handles.h"
 
 #include <linux/dma-mapping.h>
 #include <linux/hdmi.h>
@@ -154,7 +155,8 @@ nv50_dmac_create(struct nvif_device *device, struct nvif_object *disp,
 	if (!syncbuf)
 		return 0;
 
-	ret = nvif_object_init(&dmac->base.user, 0xf0000000, NV_DMA_IN_MEMORY,
+	ret = nvif_object_init(&dmac->base.user, NV50_DISP_HANDLE_SYNCBUF,
+			       NV_DMA_IN_MEMORY,
 			       &(struct nv_dma_v0) {
 					.target = NV_DMA_V0_TARGET_VRAM,
 					.access = NV_DMA_V0_ACCESS_RDWR,
@@ -165,7 +167,8 @@ nv50_dmac_create(struct nvif_device *device, struct nvif_object *disp,
 	if (ret)
 		return ret;
 
-	ret = nvif_object_init(&dmac->base.user, 0xf0000001, NV_DMA_IN_MEMORY,
+	ret = nvif_object_init(&dmac->base.user, NV50_DISP_HANDLE_VRAM,
+			       NV_DMA_IN_MEMORY,
 			       &(struct nv_dma_v0) {
 					.target = NV_DMA_V0_TARGET_VRAM,
 					.access = NV_DMA_V0_ACCESS_RDWR,

drivers/gpu/drm/nouveau/dispnv50/handles.h

+/* SPDX-License-Identifier: MIT */
+#ifndef __NV50_KMS_HANDLES_H__
+#define __NV50_KMS_HANDLES_H__
+
+/*
+ * Various hard-coded object handles that nouveau uses. These are made-up by
+ * nouveau developers, not Nvidia. The only significance of the handles chosen
+ * is that they must all be unique.
+ */
+#define NV50_DISP_HANDLE_SYNCBUF                                        0xf0000000
+#define NV50_DISP_HANDLE_VRAM                                           0xf0000001
+
+#define NV50_DISP_HANDLE_WNDW_CTX(kind)                        (0xfb000000 | kind)
+
+#endif /* !__NV50_KMS_HANDLES_H__ */

drivers/gpu/drm/nouveau/dispnv50/wndw.c

@@ -21,6 +21,7 @@
  */
 #include "wndw.h"
 #include "wimm.h"
+#include "handles.h"
 
 #include <nvif/class.h>
 #include <nvif/cl0002.h>
@@ -59,7 +60,7 @@ nv50_wndw_ctxdma_new(struct nv50_wndw *wndw, struct drm_framebuffer *fb)
 	int ret;
 
 	nouveau_framebuffer_get_layout(fb, &unused, &kind);
-	handle = 0xfb000000 | kind;
+	handle = NV50_DISP_HANDLE_WNDW_CTX(kind);
 
 	list_for_each_entry(ctxdma, &wndw->ctxdma.list, head) {
 		if (ctxdma->object.handle == handle)