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Re: [Xen-devel] [PATCH v3 5/9] xen/gntdev: Allow mappings for DMA buffers

@@ -548,6 +632,17 @@ static int gntdev_open(struct inode *inode, struct file *flip)
flip->private_data = priv;
+       priv->dma_dev = gntdev_miscdev.this_device;
+       /*
+        * The device is not spawn from a device tree, so arch_setup_dma_ops
+        * is not called, thus leaving the device with dummy DMA ops.
+        * Fix this call of_dma_configure() with a NULL node to set
+        * default DMA ops.
+        */
+       of_dma_configure(priv->dma_dev, NULL);
Please note, that the code above will need a change while
applying to the mainline kernel because of API changes [1].
Unfortunately, current Xen tip kernel tree is v4.17-rc5 based,
so I cannot make the change in this patch now.

The change is trivial and requires:
-of_dma_configure(priv->dma_dev, NULL);
+of_dma_configure(priv->dma_dev, NULL, true);
        pr_debug("priv %p\n", priv);
return 0;

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3d6ce86ee79465e1b1b6e287f8ea26b553fc768e

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