1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
new file mode 100644
index 000000000..85c03c832
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: MIT
+#include <linux/pagemap.h>
+#include <linux/slab.h>
+
+#include "nouveau_drv.h"
+#include "nouveau_mem.h"
+#include "nouveau_ttm.h"
+#include "nouveau_bo.h"
+
+struct nouveau_sgdma_be {
+	/* this has to be the first field so populate/unpopulated in
+	 * nouve_bo.c works properly, otherwise have to move them here
+	 */
+	struct ttm_tt ttm;
+	struct nouveau_mem *mem;
+};
+
+void
+nouveau_sgdma_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
+{
+	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
+
+	if (ttm) {
+		ttm_tt_fini(&nvbe->ttm);
+		kfree(nvbe);
+	}
+}
+
+int
+nouveau_sgdma_bind(struct ttm_device *bdev, struct ttm_tt *ttm, struct ttm_resource *reg)
+{
+	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
+	struct nouveau_drm *drm = nouveau_bdev(bdev);
+	struct nouveau_mem *mem = nouveau_mem(reg);
+	int ret;
+
+	if (nvbe->mem)
+		return 0;
+
+	ret = nouveau_mem_host(reg, &nvbe->ttm);
+	if (ret)
+		return ret;
+
+	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
+		ret = nouveau_mem_map(mem, &mem->cli->vmm.vmm, &mem->vma[0]);
+		if (ret) {
+			nouveau_mem_fini(mem);
+			return ret;
+		}
+	}
+
+	nvbe->mem = mem;
+	return 0;
+}
+
+void
+nouveau_sgdma_unbind(struct ttm_device *bdev, struct ttm_tt *ttm)
+{
+	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
+	if (nvbe->mem) {
+		nouveau_mem_fini(nvbe->mem);
+		nvbe->mem = NULL;
+	}
+}
+
+struct ttm_tt *
+nouveau_sgdma_create_ttm(struct ttm_buffer_object *bo, uint32_t page_flags)
+{
+	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
+	struct nouveau_bo *nvbo = nouveau_bo(bo);
+	struct nouveau_sgdma_be *nvbe;
+	enum ttm_caching caching;
+
+	if (nvbo->force_coherent)
+		caching = ttm_uncached;
+	else if (drm->agp.bridge)
+		caching = ttm_write_combined;
+	else
+		caching = ttm_cached;
+
+	nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
+	if (!nvbe)
+		return NULL;
+
+	if (ttm_sg_tt_init(&nvbe->ttm, bo, page_flags, caching)) {
+		kfree(nvbe);
+		return NULL;
+	}
+	return &nvbe->ttm;
+}