1 files changed, 116 insertions, 0 deletions

diff --git a/kernel/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/kernel/drivers/gpu/drm/nouveau/nouveau_sgdma.c
new file mode 100644
index 000000000..8c3053a17
--- /dev/null
+++ b/kernel/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -0,0 +1,116 @@
+#include <linux/pagemap.h>
+#include <linux/slab.h>
+
+#include "nouveau_drm.h"
+#include "nouveau_ttm.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_dma_tt ttm;
+	struct nvkm_mem *node;
+};
+
+static void
+nouveau_sgdma_destroy(struct ttm_tt *ttm)
+{
+	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
+
+	if (ttm) {
+		ttm_dma_tt_fini(&nvbe->ttm);
+		kfree(nvbe);
+	}
+}
+
+static int
+nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
+{
+	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
+	struct nvkm_mem *node = mem->mm_node;
+
+	if (ttm->sg) {
+		node->sg    = ttm->sg;
+		node->pages = NULL;
+	} else {
+		node->sg    = NULL;
+		node->pages = nvbe->ttm.dma_address;
+	}
+	node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
+
+	nvkm_vm_map(&node->vma[0], node);
+	nvbe->node = node;
+	return 0;
+}
+
+static int
+nv04_sgdma_unbind(struct ttm_tt *ttm)
+{
+	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
+	nvkm_vm_unmap(&nvbe->node->vma[0]);
+	return 0;
+}
+
+static struct ttm_backend_func nv04_sgdma_backend = {
+	.bind			= nv04_sgdma_bind,
+	.unbind			= nv04_sgdma_unbind,
+	.destroy		= nouveau_sgdma_destroy
+};
+
+static int
+nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
+{
+	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
+	struct nvkm_mem *node = mem->mm_node;
+
+	/* noop: bound in move_notify() */
+	if (ttm->sg) {
+		node->sg    = ttm->sg;
+		node->pages = NULL;
+	} else {
+		node->sg    = NULL;
+		node->pages = nvbe->ttm.dma_address;
+	}
+	node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
+	return 0;
+}
+
+static int
+nv50_sgdma_unbind(struct ttm_tt *ttm)
+{
+	/* noop: unbound in move_notify() */
+	return 0;
+}
+
+static struct ttm_backend_func nv50_sgdma_backend = {
+	.bind			= nv50_sgdma_bind,
+	.unbind			= nv50_sgdma_unbind,
+	.destroy		= nouveau_sgdma_destroy
+};
+
+struct ttm_tt *
+nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
+			 unsigned long size, uint32_t page_flags,
+			 struct page *dummy_read_page)
+{
+	struct nouveau_drm *drm = nouveau_bdev(bdev);
+	struct nouveau_sgdma_be *nvbe;
+
+	nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
+	if (!nvbe)
+		return NULL;
+
+	if (drm->device.info.family < NV_DEVICE_INFO_V0_TESLA)
+		nvbe->ttm.ttm.func = &nv04_sgdma_backend;
+	else
+		nvbe->ttm.ttm.func = &nv50_sgdma_backend;
+
+	if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
+		/*
+		 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
+		 * and thus our nouveau_sgdma_destroy() hook, so we don't need
+		 * to free nvbe here.
+		 */
+		return NULL;
+	return &nvbe->ttm.ttm;
+}