[RFC PATCH v1 2/6] of/device: Don't back devices DMA with IOMMU if that's undesired by driver
From: Dmitry Osipenko <hidden>
Date: 2018-07-26 23:23:00
Also in:
dri-devel, linux-iommu, linux-tegra, lkml, nouveau
Subsystem:
open firmware and flattened device tree, the rest · Maintainers:
Rob Herring, Saravana Kannan, Linus Torvalds
Respect device driver requirement for device DMA not to be implicitly backed with IOMMU by skipping the backing setup for drivers that do not want that. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/of/device.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 33d85511d790..e70b7a886875 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c@@ -163,6 +163,13 @@ int of_dma_configure(struct device *dev, struct device_node *np, bool force_dma) dev_dbg(dev, "device is%sbehind an iommu\n", iommu ? " " : " not "); + /* + * Respect device driver requirement for device DMA not to be + * implicitly backed with IOMMU. + */ + if (iommu && dev->driver->no_implicit_iommu) + iommu = NULL; + arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent); return 0;
--
2.18.0
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