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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>
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@ -15,6 +15,10 @@
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#include <drm/drm_atomic.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_atomic_helper.h>
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#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
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#include <asm/dma-iommu.h>
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#endif
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#include "drm.h"
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#include "drm.h"
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#include "gem.h"
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#include "gem.h"
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@ -1068,6 +1072,14 @@ struct iommu_group *host1x_client_iommu_attach(struct host1x_client *client,
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}
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}
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if (!shared || (shared && (group != tegra->group))) {
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if (!shared || (shared && (group != tegra->group))) {
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#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
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if (client->dev->archdata.mapping) {
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struct dma_iommu_mapping *mapping =
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to_dma_iommu_mapping(client->dev);
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arm_iommu_detach_device(client->dev);
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arm_iommu_release_mapping(mapping);
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}
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#endif
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err = iommu_attach_group(tegra->domain, group);
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err = iommu_attach_group(tegra->domain, group);
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if (err < 0) {
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if (err < 0) {
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iommu_group_put(group);
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iommu_group_put(group);
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