drm/tegra: gem: Take into account IOMMU aperture
The IOMMU may not always be able to address 2 GiB of memory. On Tegra20, the GART supports 32 MiB starting at 0x58000000. Also the aperture on Tegra30 and later is in fact the full 4 GiB, rather than just 2 GiB as currently assumed. Signed-off-by: Thierry Reding <treding@nvidia.com>
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@ -124,14 +124,22 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
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return -ENOMEM;
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if (iommu_present(&platform_bus_type)) {
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struct iommu_domain_geometry *geometry;
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u64 start, end;
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tegra->domain = iommu_domain_alloc(&platform_bus_type);
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if (!tegra->domain) {
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err = -ENOMEM;
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goto free;
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}
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DRM_DEBUG("IOMMU context initialized\n");
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drm_mm_init(&tegra->mm, 0, SZ_2G);
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geometry = &tegra->domain->geometry;
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start = geometry->aperture_start;
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end = geometry->aperture_end;
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DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
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start, end);
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drm_mm_init(&tegra->mm, start, end - start + 1);
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}
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mutex_init(&tegra->clients_lock);
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