From 5ac93f81096a2065adb99defdb8f04ae2c19cc11 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Sun, 19 Aug 2018 17:24:20 +0300 Subject: drm/tegra: Detach devices from IOMMU DMA domain on arm32 All Tegra DRM devices are getting attached to an implicit IOMMU DMA domain if CONFIG_ARM_DMA_USE_IOMMU=y. Since Tegra DRM driver manages IOMMU by itself, the devices must be detached from the implicit domain using arch-specific IOMMU-API. Note that this works only for arm32 and not for arm64, which will remain broken if CONFIG_IOMMU_DMA is enabled. Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding --- drivers/gpu/drm/tegra/drm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c index 0ee924e3d0a1..552046062ec8 100644 --- a/drivers/gpu/drm/tegra/drm.c +++ b/drivers/gpu/drm/tegra/drm.c @@ -15,6 +15,10 @@ #include #include +#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) +#include +#endif + #include "drm.h" #include "gem.h" @@ -1068,6 +1072,14 @@ struct iommu_group *host1x_client_iommu_attach(struct host1x_client *client, } if (!shared || (shared && (group != tegra->group))) { +#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) + if (client->dev->archdata.mapping) { + struct dma_iommu_mapping *mapping = + to_dma_iommu_mapping(client->dev); + arm_iommu_detach_device(client->dev); + arm_iommu_release_mapping(mapping); + } +#endif err = iommu_attach_group(tegra->domain, group); if (err < 0) { iommu_group_put(group); -- cgit v1.2.3