From: Dmitry Osipenko <digetx@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Mikko Perttunen <cyndis@kapsi.fi>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Ben Skeggs <bskeggs@redhat.com>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>, Joerg Roedel <joro@8bytes.org>,
Nicolas Chauvet <kwizart@gmail.com>
Cc: devicetree@vger.kernel.org, nouveau@lists.freedesktop.org,
iommu@lists.linux-foundation.org,
dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [RFC PATCH v1 2/6] of/device: Don't back devices DMA with IOMMU if that's undesired by driver
Date: Fri, 27 Jul 2018 02:16:20 +0300 [thread overview]
Message-ID: <20180726231624.21084-3-digetx@gmail.com> (raw)
In-Reply-To: <20180726231624.21084-1-digetx@gmail.com>
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
next prev parent reply other threads:[~2018-07-26 23:23 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-26 23:16 [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU Dmitry Osipenko
2018-07-26 23:16 ` [RFC PATCH v1 1/6] driver core: Add option for disabling of backing devices DMA " Dmitry Osipenko
2018-07-26 23:16 ` Dmitry Osipenko [this message]
2018-07-26 23:16 ` [RFC PATCH v1 3/6] drm/tegra: Avoid implicit DMA backing " Dmitry Osipenko
2018-07-26 23:16 ` [RFC PATCH v1 4/6] gpu: host1x: " Dmitry Osipenko
2018-07-26 23:16 ` [RFC PATCH v1 5/6] drm/nouveau: tegra: Universally avoid " Dmitry Osipenko
2018-07-26 23:16 ` [RFC PATCH v1 6/6] Revert "drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping" Dmitry Osipenko
2018-07-27 8:25 ` [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU Joerg Roedel
2018-07-27 9:03 ` Will Deacon
2018-07-27 14:10 ` Dmitry Osipenko
2018-07-27 14:20 ` Joerg Roedel
2018-07-27 17:13 ` Rob Herring
2018-07-27 18:31 ` Joerg Roedel
2018-07-27 20:02 ` Dmitry Osipenko
2018-07-27 16:02 ` Robin Murphy
2018-07-27 17:03 ` Jordan Crouse
2018-07-27 17:16 ` Dmitry Osipenko
2018-07-28 11:40 ` Dmitry Osipenko
2018-08-02 18:24 ` Dmitry Osipenko
2018-08-03 15:43 ` Robin Murphy
2018-08-03 17:00 ` Jordan Crouse
2018-08-15 19:56 ` Dmitry Osipenko
2018-08-16 17:23 ` Robin Murphy
2018-09-20 17:09 ` Dmitry Osipenko
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