fix nouveau on Tegra, Enable IOMMU on Exynos

arm-tegra-fix-nouveau-crash.patch

@@ -0,0 +1,64 @@
+From 369971aa0101c4cfb84dacaaaa1b5cc5790c14ff Mon Sep 17 00:00:00 2001
+From: Thierry Reding <treding@nvidia.com>
+Date: Wed, 11 Apr 2018 10:34:17 +0200
+Subject: [PATCH] drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping
+
+Depending on the kernel configuration, early ARM architecture setup code
+may have attached the GPU to a DMA/IOMMU mapping that transparently uses
+the IOMMU to back the DMA API. Tegra requires special handling for IOMMU
+backed buffers (a special bit in the GPU's MMU page tables indicates the
+memory path to take: via the SMMU or directly to the memory controller).
+Transparently backing DMA memory with an IOMMU prevents Nouveau from
+properly handling such memory accesses and causes memory access faults.
+
+As a side-note: buffers other than those allocated in instance memory
+don't need to be physically contiguous from the GPU's perspective since
+the GPU can map them into contiguous buffers using its own MMU. Mapping
+these buffers through the IOMMU is unnecessary and will even lead to
+performance degradation because of the additional translation.
+
+Signed-off-by: Thierry Reding <treding@nvidia.com>
+---
+ drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 19 +++++++++++++++++++
+ 1 file changed, 19 insertions(+)
+
+diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
+index 1f07999aea1d..ac7706f56f6f 100644
+--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
++++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
+@@ -19,6 +19,11 @@
+  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+  * DEALINGS IN THE SOFTWARE.
+  */
++
++#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
++#include <asm/dma-iommu.h>
++#endif
++
+ #include <core/tegra.h>
+ #ifdef CONFIG_NOUVEAU_PLATFORM_DRIVER
+ #include "priv.h"
+@@ -105,6 +110,20 @@ nvkm_device_tegra_probe_iommu(struct nvkm_device_tegra *tdev)
+ 	unsigned long pgsize_bitmap;
+ 	int ret;
+ 
++#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
++	if (dev->archdata.mapping) {
++		struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
++
++		arm_iommu_release_mapping(mapping);
++		arm_iommu_detach_device(dev);
++
++		if (dev->archdata.dma_coherent)
++			set_dma_ops(dev, &arm_coherent_dma_ops);
++		else
++			set_dma_ops(dev, &arm_dma_ops);
++	}
++#endif
++
+ 	if (!tdev->func->iommu_bit)
+ 		return;
+ 
+-- 
+2.16.3
+

configs/fedora/generic/arm/armv7/CONFIG_DRM_EXYNOS_IOMMU

@@ -1 +1 @@
-# CONFIG_DRM_EXYNOS_IOMMU is not set
+CONFIG_DRM_EXYNOS_IOMMU=y

configs/fedora/generic/arm/armv7/CONFIG_EXYNOS_IOMMU

@@ -1 +1 @@
-# CONFIG_EXYNOS_IOMMU is not set
+CONFIG_EXYNOS_IOMMU=y

kernel-armv7hl-debug.config

@@ -1386,7 +1386,7 @@ CONFIG_DRM_EXYNOS_DSI=y
 CONFIG_DRM_EXYNOS_FIMD=y
 CONFIG_DRM_EXYNOS_G2D=y
 CONFIG_DRM_EXYNOS_HDMI=y
-# CONFIG_DRM_EXYNOS_IOMMU is not set
+CONFIG_DRM_EXYNOS_IOMMU=y
 CONFIG_DRM_EXYNOS=m
 CONFIG_DRM_EXYNOS_MIC=y
 CONFIG_DRM_EXYNOS_MIXER=y
@@ -1702,7 +1702,7 @@ CONFIG_EXYNOS5420_MCPM=y
 CONFIG_EXYNOS_ADC=m
 CONFIG_EXYNOS_AUDSS_CLK_CON=m
 # CONFIG_EXYNOS_IOMMU_DEBUG is not set
-# CONFIG_EXYNOS_IOMMU is not set
+CONFIG_EXYNOS_IOMMU=y
 CONFIG_EXYNOS_THERMAL=y
 # CONFIG_EZNPS_GIC is not set
 # CONFIG_EZX_PCAP is not set

kernel-armv7hl-lpae-debug.config

@@ -1328,7 +1328,7 @@ CONFIG_DRM_EXYNOS_DSI=y
 CONFIG_DRM_EXYNOS_FIMD=y
 CONFIG_DRM_EXYNOS_G2D=y
 CONFIG_DRM_EXYNOS_HDMI=y
-# CONFIG_DRM_EXYNOS_IOMMU is not set
+CONFIG_DRM_EXYNOS_IOMMU=y
 CONFIG_DRM_EXYNOS=m
 CONFIG_DRM_EXYNOS_MIC=y
 CONFIG_DRM_EXYNOS_MIXER=y
@@ -1611,7 +1611,7 @@ CONFIG_EXYNOS5420_MCPM=y
 CONFIG_EXYNOS_ADC=m
 CONFIG_EXYNOS_AUDSS_CLK_CON=m
 # CONFIG_EXYNOS_IOMMU_DEBUG is not set
-# CONFIG_EXYNOS_IOMMU is not set
+CONFIG_EXYNOS_IOMMU=y
 CONFIG_EXYNOS_THERMAL=y
 # CONFIG_EZNPS_GIC is not set
 # CONFIG_EZX_PCAP is not set

kernel-armv7hl-lpae.config

@@ -1318,7 +1318,7 @@ CONFIG_DRM_EXYNOS_DSI=y
 CONFIG_DRM_EXYNOS_FIMD=y
 CONFIG_DRM_EXYNOS_G2D=y
 CONFIG_DRM_EXYNOS_HDMI=y
-# CONFIG_DRM_EXYNOS_IOMMU is not set
+CONFIG_DRM_EXYNOS_IOMMU=y
 CONFIG_DRM_EXYNOS=m
 CONFIG_DRM_EXYNOS_MIC=y
 CONFIG_DRM_EXYNOS_MIXER=y
@@ -1601,7 +1601,7 @@ CONFIG_EXYNOS5420_MCPM=y
 CONFIG_EXYNOS_ADC=m
 CONFIG_EXYNOS_AUDSS_CLK_CON=m
 # CONFIG_EXYNOS_IOMMU_DEBUG is not set
-# CONFIG_EXYNOS_IOMMU is not set
+CONFIG_EXYNOS_IOMMU=y
 CONFIG_EXYNOS_THERMAL=y
 # CONFIG_EZNPS_GIC is not set
 # CONFIG_EZX_PCAP is not set

kernel-armv7hl.config

@@ -1376,7 +1376,7 @@ CONFIG_DRM_EXYNOS_DSI=y
 CONFIG_DRM_EXYNOS_FIMD=y
 CONFIG_DRM_EXYNOS_G2D=y
 CONFIG_DRM_EXYNOS_HDMI=y
-# CONFIG_DRM_EXYNOS_IOMMU is not set
+CONFIG_DRM_EXYNOS_IOMMU=y
 CONFIG_DRM_EXYNOS=m
 CONFIG_DRM_EXYNOS_MIC=y
 CONFIG_DRM_EXYNOS_MIXER=y
@@ -1692,7 +1692,7 @@ CONFIG_EXYNOS5420_MCPM=y
 CONFIG_EXYNOS_ADC=m
 CONFIG_EXYNOS_AUDSS_CLK_CON=m
 # CONFIG_EXYNOS_IOMMU_DEBUG is not set
-# CONFIG_EXYNOS_IOMMU is not set
+CONFIG_EXYNOS_IOMMU=y
 CONFIG_EXYNOS_THERMAL=y
 # CONFIG_EZNPS_GIC is not set
 # CONFIG_EZX_PCAP is not set

kernel.spec

@@ -583,6 +583,8 @@ Patch304: arm-dts-imx6qdl-udoo-Disable-usbh1-to-avoid-kernel-hang.patch
 # https://marc.info/?l=linux-kernel&m=152328880417846&w=2
 Patch308: arm64-thunderx-crypto-zip-fixes.patch
 
+Patch309: arm-tegra-fix-nouveau-crash.patch
+
 # Fix USB on the RPi https://patchwork.kernel.org/patch/9879371/
 Patch320: bcm283x-dma-mapping-skip-USB-devices-when-configuring-DMA-during-probe.patch
 
@@ -1856,6 +1858,10 @@ fi
 #
 #
 %changelog
+* Thu Apr 12 2018 Peter Robinson <pbrobinson@fedoraproject.org>
+- Patch to fix nouveau on Tegra platforms
+- Enable IOMMU on Exynos now upstream does
+
 * Wed Apr 11 2018 Laura Abbott <labbott@redhat.com>
 - Enable JFFS2 and some MTD modules (rhbz 1474493)
 - Enable a few infiniband options (rhbz 1291902)