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From: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Greg Kroah-Hartman
	<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
	"Rafael J. Wysocki"
	<rafael-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Jonathan Hunter
	<jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	Mikko Perttunen <cyndis-/1wQRMveznE@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Frank Rowand
	<frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Ben Skeggs <bskeggs-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Russell King <linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>,
	Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
	Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
	Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>,
	Nicolas Chauvet <kwizart-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

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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  parent reply	other threads:[~2018-07-26 23:16 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
     [not found] ` <20180726231624.21084-1-digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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 6/6] Revert "drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping" Dmitry Osipenko
2018-07-26 23:16 ` [RFC PATCH v1 5/6] drm/nouveau: tegra: Universally avoid implicit DMA backing with IOMMU Dmitry Osipenko
2018-07-27  8:25 ` [RFC PATCH v1 0/6] Resolve unwanted " Joerg Roedel
2018-07-27  9:03   ` Will Deacon
     [not found]     ` <20180727090328.GH28088-5wv7dgnIgG8@public.gmane.org>
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
     [not found]               ` <20180727183134.GD6738-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2018-07-27 20:02                 ` Dmitry Osipenko
2018-07-27 16:02         ` Robin Murphy
     [not found]           ` <daadd395-dcb7-9505-f171-0fcc28570301-5wv7dgnIgG8@public.gmane.org>
2018-07-27 17:03             ` Jordan Crouse
     [not found]               ` <20180727170326.GA21283-9PYrDHPZ2Orvke4nUoYGnHL1okKdlPRT@public.gmane.org>
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
     [not found]                           ` <afecce46-96d2-9688-30b4-0a3f17a651d3-5wv7dgnIgG8@public.gmane.org>
2018-09-20 17:09                             ` Dmitry Osipenko

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