drm/nouveau/kms/nv50-: add module option to select EVO/NVD push buffer location

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

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index c636703..bd7af3d 100644 (file)
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -220,6 +220,10 @@ nv50_dmac_wait(struct nvif_push *push, u32 size)
        return 0;
 }
 
+MODULE_PARM_DESC(kms_vram_pushbuf, "Place EVO/NVD push buffers in VRAM (default: auto)");
+static int nv50_dmac_vram_pushbuf = -1;
+module_param_named(kms_vram_pushbuf, nv50_dmac_vram_pushbuf, int, 0400);
+
 int
 nv50_dmac_create(struct nvif_device *device, struct nvif_object *disp,
                 const s32 *oclass, u8 head, void *data, u32 size, s64 syncbuf,
@@ -241,7 +245,8 @@ nv50_dmac_create(struct nvif_device *device, struct nvif_object *disp,
         *
         * This appears to match NVIDIA's behaviour on Pascal.
         */
-       if (device->info.family == NV_DEVICE_INFO_V0_PASCAL)
+       if ((nv50_dmac_vram_pushbuf > 0) ||
+           (nv50_dmac_vram_pushbuf < 0 && device->info.family == NV_DEVICE_INFO_V0_PASCAL))
                type |= NVIF_MEM_VRAM;
 
        ret = nvif_mem_ctor_map(&cli->mmu, "kmsChanPush", type, 0x1000,