diff options
| author | Dmitry Osipenko <digetx@gmail.com> | 2018-08-19 17:24:20 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2018-09-26 17:24:02 +0200 |
| commit | 5ac93f81096a2065adb99defdb8f04ae2c19cc11 (patch) | |
| tree | 2ae10b0b43c288a1690f050416249e4e0f4c9f89 /drivers/gpu/drm/tegra | |
| parent | e31c8ea5aff8670275e4e451fdc3bca5fbc8a528 (diff) | |
| download | linux-5ac93f81096a2065adb99defdb8f04ae2c19cc11.tar.gz linux-5ac93f81096a2065adb99defdb8f04ae2c19cc11.tar.bz2 linux-5ac93f81096a2065adb99defdb8f04ae2c19cc11.zip | |
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 <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/gpu/drm/tegra')
| -rw-r--r-- | drivers/gpu/drm/tegra/drm.c | 12 |
1 files changed, 12 insertions, 0 deletions
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 <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> +#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) +#include <asm/dma-iommu.h> +#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); |