Re: [PATCH v3 18/18] drm/tegra: Use the iommu dma_owner mechanism

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On 12/6/21 8:40 PM, Jason Gunthorpe wrote:
On Mon, Dec 06, 2021 at 09:59:03AM +0800, Lu Baolu wrote:

@@ -941,48 +944,44 @@ int host1x_client_iommu_attach(struct host1x_client *client)
  	 * not the shared IOMMU domain, don't try to attach it to a different
  	 * domain. This allows using the IOMMU-backed DMA API.
  	 */
-	if (domain && domain != tegra->domain)
+	client->group = NULL;
+	if (!client->dev->iommu_group || (domain && domain != tegra->domain))
+		return iommu_device_set_dma_owner(client->dev,
+						  DMA_OWNER_DMA_API, NULL);
+
+	if (!tegra->domain)
  		return 0;

This if should be removed completely now

Jason


Sure.

Best regards,
baolu



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