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Re: [Xen-devel] [PATCH v3 5/9] xen/gntdev: Allow mappings for DMA buffers
- To: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, jgross@xxxxxxxx, boris.ostrovsky@xxxxxxxxxx, konrad.wilk@xxxxxxxxxx
- From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
- Date: Thu, 14 Jun 2018 10:00:22 +0300
- Authentication-results: spf=none (sender IP is ) smtp.mailfrom=Oleksandr_Andrushchenko@xxxxxxxx;
- Cc: daniel.vetter@xxxxxxxxx, matthew.d.roper@xxxxxxxxx, dongwon.kim@xxxxxxxxx
- Delivery-date: Thu, 14 Jun 2018 07:00:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Spamdiagnosticmetadata: NSPM
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@@ -548,6 +632,17 @@ static int gntdev_open(struct inode *inode, struct
file *flip)
}
flip->private_data = priv;
+#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
+ 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);
+#endif
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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