kernel 5.8.7

1 files changed, 113 insertions, 0 deletions

diff --git a/SOURCES/memory-tegra-Remove-GPU-from-DRM-IOMMU-group.patch b/SOURCES/memory-tegra-Remove-GPU-from-DRM-IOMMU-group.patch
new file mode 100644
index 0000000..7b30b78
--- /dev/null
+++ b/SOURCES/memory-tegra-Remove-GPU-from-DRM-IOMMU-group.patch
@@ -0,0 +1,113 @@
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+ Tue, 01 Sep 2020 08:32:52 -0700 (PDT)
+From: Thierry Reding <thierry.reding@gmail.com>
+To: Krzysztof Kozlowski <krzk@kernel.org>,
+ Thierry Reding <thierry.reding@gmail.com>
+Cc: Jonathan Hunter <jonathanh@nvidia.com>, Dmitry Osipenko <digetx@gmail.com>,
+ linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
+ Matias Zuniga <matias.nicolas.zc@gmail.com>
+Subject: [PATCH] memory: tegra: Remove GPU from DRM IOMMU group
+Date: Tue,  1 Sep 2020 17:32:48 +0200
+Message-Id: <20200901153248.1831263-1-thierry.reding@gmail.com>
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+
+From: Thierry Reding <treding@nvidia.com>
+
+Commit 63a613fdb16c ("memory: tegra: Add gr2d and gr3d to DRM IOMMU
+group") added the GPU to the DRM IOMMU group, which doesn't make any
+sense. This causes problems when Nouveau tries to attach to the SMMU
+and causes it to fall back to using the DMA API.
+
+Remove the GPU from the DRM groups to restore the old behaviour. The
+GPU should always have its own IOMMU domain to make sure it can map
+buffers into contiguous chunks (for big page support) without getting
+in the way of mappings from the DRM group.
+
+Fixes: 63a613fdb16c ("memory: tegra: Add gr2d and gr3d to DRM IOMMU group")
+Reported-by: Matias Zuniga <matias.nicolas.zc@gmail.com>
+Signed-off-by: Thierry Reding <treding@nvidia.com>
+Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
+---
+ drivers/memory/tegra/tegra124.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/drivers/memory/tegra/tegra124.c b/drivers/memory/tegra/tegra124.c
+index 493b5dc3a4b3..0cede24479bf 100644
+--- a/drivers/memory/tegra/tegra124.c
++++ b/drivers/memory/tegra/tegra124.c
+@@ -957,7 +957,6 @@ static const struct tegra_smmu_swgroup tegra124_swgroups[] = {
+ static const unsigned int tegra124_group_drm[] = {
+ 	TEGRA_SWGROUP_DC,
+ 	TEGRA_SWGROUP_DCB,
+-	TEGRA_SWGROUP_GPU,
+ 	TEGRA_SWGROUP_VIC,
+ };
+