+static int
+nouveau_ttm_tt_populate(struct ttm_tt *ttm)
+{
+ struct ttm_dma_tt *ttm_dma = (void *)ttm;
+ struct drm_nouveau_private *dev_priv;
+ struct drm_device *dev;
+ unsigned i;
+ int r;
+
+ if (ttm->state != tt_unpopulated)
+ return 0;
+
+ dev_priv = nouveau_bdev(ttm->bdev);
+ dev = dev_priv->dev;
+
+#ifdef CONFIG_SWIOTLB
+ if (swiotlb_nr_tbl()) {
+ return ttm_dma_populate((void *)ttm, dev->dev);
+ }
+#endif
+
+ r = ttm_pool_populate(ttm);
+ if (r) {
+ return r;
+ }
+
+ for (i = 0; i < ttm->num_pages; i++) {
+ ttm_dma->dma_address[i] = pci_map_page(dev->pdev, ttm->pages[i],
+ 0, PAGE_SIZE,
+ PCI_DMA_BIDIRECTIONAL);
+ if (pci_dma_mapping_error(dev->pdev, ttm_dma->dma_address[i])) {
+ while (--i) {
+ pci_unmap_page(dev->pdev, ttm_dma->dma_address[i],
+ PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+ ttm_dma->dma_address[i] = 0;
+ }
+ ttm_pool_unpopulate(ttm);
+ return -EFAULT;
+ }
+ }
+ return 0;
+}
+
+static void
+nouveau_ttm_tt_unpopulate(struct ttm_tt *ttm)
+{
+ struct ttm_dma_tt *ttm_dma = (void *)ttm;
+ struct drm_nouveau_private *dev_priv;
+ struct drm_device *dev;
+ unsigned i;
+
+ dev_priv = nouveau_bdev(ttm->bdev);
+ dev = dev_priv->dev;
+
+#ifdef CONFIG_SWIOTLB
+ if (swiotlb_nr_tbl()) {
+ ttm_dma_unpopulate((void *)ttm, dev->dev);
+ return;
+ }
+#endif
+
+ for (i = 0; i < ttm->num_pages; i++) {
+ if (ttm_dma->dma_address[i]) {
+ pci_unmap_page(dev->pdev, ttm_dma->dma_address[i],
+ PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+ }
+ }
+
+ ttm_pool_unpopulate(ttm);
+}
+